Issue: 519th September 2018

BA304G, BA304G-SS,BA324G & BA324G-SS

intrinsically safeloop-powered

field mounting indicatorsIssue 5

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1. Description

2. Operation2.1 Controls

3. Intrinsic safety certification3.1 ATEX gas certification3.2 Zones, gas groups & T rating3.3 4/20mA input3.4 Certification label information

4. System Design for Gas HazardousAreas

4.1 Transmitter loops4.2 Remote indication

5. Installation5.1 Location5.2 GRP models BA304G & BA324G5.3 Stainless steel models BA304G-SS &

BA324G-SS.5.4 Installation procedure5.5 EMC5.6 Units of measurement and tag marking

on scale card.

6. Configuration and Calibration6.1 Summary of configuration functions6.2 Indicator function: FunC

6.3 Resolution: rE5n

6.4 Position of the decimal point: dP

6.5 Calibration using an external currentsource: CAL.

6.6 Calibration using internal reference: 5Et

6.7 Bargraph format and calibration: bAr

6.8 Function of the ( push-button: C--P

6.9 Tare function: tArE

6.10 Security code: CodE

6.11 Reset to factory defaults: r5Et

6.12 Under and over-range

7. Lineariser7.1 Lineariser calibration using an external

current source.7.1.1 Example, Adding break-points

to a new indicator.7.2 Lineariser calibration using internal

reference.7.2.1 Example, Adding break-points

to a new indicator.7.3 Under and over-range7.4 Lineariser default configuration

8. Maintenance8.1 Fault finding during commissioning8.2 Fault finding after commissioning8.3 Servicing8.4 Routine maintenance8.5 Guarantee8.6 Customer comments

9. Accessories9.1 Units of measurement and instrument

identification.

9.2 Display backlight9.2.1 Loop powering the backlight9.2.2 Separately powering the

backlight

9.3 Alarms9.3.1 Solid state output9.3.2 Intrinsic safety9.3.3 Configuration and adjustment.9.3.4 Alarm enable: EnbL

9.3.5 Setpoint adjustment:5P1 and 5P2.

9.3.6 Alarm function: Hi . Lo

9.3.7 Alarm output status: no . nC

9.3.8 Hysteresis: H5tr

9.3.9 Alarm delay: dELA

9.3.10 Alarm silence time: 5iL

9.3.11 Flash display when alarmoccurs: FL5H.

9.3.12 Access setpoint in displaymode: AC5P.

9.3.13 Adjusting alarm setpoints fromthe display mode.

9.3.14 Display setpoints on BA324G-SS bargraph.

9.4 Pipe mounting kit

9.5 Panel mounting kits9.5.1 BA394G 9.5.2 BA494G9.5.3 BA494G-SS

9.6 Back-box terminal assembly

Appendix 1 ATEX dust certification

Appendix 2 IECEx gas and dust certification

Appendix 3 ETL and cETL certification

CONTENTS

The BA304G, BA304G-SS, BA324G and BA324G-SS are CE marked to show compliance with theEuropean Explosive Atmospheres Directive 2014/34/EU and the European EMC Directive 2014/30/EU

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1. DESCRIPTIONThese field mounting, intrinsically safe digitalindicators display the current flowing in a 4/20mAloop in engineering units. They are loop poweredbut only introduce a 1.2V drop, which allows themto be installed into almost any 4/20mA currentloop. No additional power supply or battery isrequired.

The four models are electrically similar, but havedifferent size displays and enclosure materials.

Model Display

BA304G 4 digits 34mm high inGRP enclosure.

BA304G-SS 4 digits 34mm high instainless steel enclosure.

BA324G 5 digits 29mm high and31 segment bargraphin GRP enclosure.

BA324G-SS 5 digits 29mm high and31 segment bargraph instainless steel enclosure.

This instruction manual supplements theinstruction sheet supplied with each instrument.

The main application for all models is to display ameasured variable or control signal in a hazardousprocess area. The zero and span of the displayare independently adjustable so that the indicatorcan be calibrated to display any variablerepresented by the 4/20mA current, e.g.temperature, flow, pressure or level.

All models have been certified intrinsically safe foruse in gas and dust hazardous areas by NotifiedBody Intertek Testing and Certification Ltd andcomply with the European ATEX Directive2014/34/EU. The EC-Type Examination certificatespecifies that under fault conditions the outputvoltage, current and power at the 4/20mA inputterminals will not exceed those specified for simpleapparatus in Clause 5.7 of EN 60079-11, whichsimplifies installation and documentation.

For international applications all models haveIECEx certification which is described inAppendix 2.

For applications in the USA and Canada all modelshave ETL and cETL certification which is describedin Appendix 3.

2. OPERATIONFig 1 shows a simplified block diagram of allmodels. The 4/20mA input current flows throughresistor R1 and forward biased diode D1. Thevoltage developed across D1, which is relativelyconstant, is multiplied by a switch mode powersupply and used to power the instrument. Thevoltage developed across R1, which is proportionalto the 4/20mA input current, provides the inputsignal for the analogue to digital converter.

Each time a 4/20mA current is applied to theinstrument, initialisation is performed during whichall segments of the display are activated, after fiveseconds the instrument displays the input currentusing the calibration information stored in theinstrument memory. If the loop current is too lowto power the instrument the indicator will displaythe error message LPLo.

Fig 1 Indicator block diagram

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2.1 ControlsAll models are controlled and calibrated via fourfront panel push buttons. In the display mode i.e.when the indicator is displaying a process variable,these push buttons have the following functions:

( While this button is pushed theindicator will display the input currentin mA, or as a percentage of theinstrument span depending upon howthe indicator has been configured.When the button is released thenormal display in engineering unitswill return. The function of this pushbutton is modified when optionalalarms are fitted to the indicator.

& While this button is pushed theindicator will display the numericalvalue and analogue bargraph* theindicator has been calibrated todisplay with a 4mAΦ input. Whenreleased the normal display inengineering units will return.

* While this button is pushed theindicator will display the numericalvalue and analogue bargraph* theindicator has been calibrated todisplay with a 20mAΦ input. Whenreleased the normal display inengineering units will return.

) No function in the display modeunless the tare function is being used.

( + & Indicator displays firmware numberfollowed by version.

( + * Provides direct access to the alarmsetpoints when the indicator is fittedwith optional alarms and the AC5P

access setpoints function has beenenabled.

( + ) Provides access to the configurationmenu via optional security code.

Note: * BA324G and BA324G-SS only

Φ If the indicator has beencalibrated using the CALfunction, calibration points maynot be 4 and 20mA.

3. INTRINSIC SAFETY CERTIFICATIONAll models have ATEX and IECEx gas and dustcertification. This section of the instruction manualdescribes ATEX gas certification. ATEX dust andIECEx approvals are described in Appendixes 1and 2.

3.1 ATEX gas certificationNotified Body Intertek Testing and Certification Ltdhave issued all the models with a commonEC-Type Examination Certificate numberITS11ATEX27253X. This confirms compliancewith harmonised European standards and it hasbeen used to confirm compliance with theEuropean ATEX Directive for Group II,Category 1G equipment, Ex ia IIC T5 Ga Ta = - 40°C to +70°C. The indicators carry thecommunity mark and, subject to local codes ofpractice, may be installed in any of the EuropeanEconomic Area (EEA) member countries. ATEXcertificates are also acceptable for installations inSwitzerland and some other countries - see BlueBook.

This section of the instruction manual describesATEX installations in explosive gas atmospheresconforming with EN60079-14 Electricalinstallations design, selection and erection. Whendesigning systems for installation outside the UKthe local Code of Practice should be consulted.

3.2 Zones, gas groups and T ratingAll models have been certified Ex ia IIC T5. Whenconnected to a suitable system they may beinstalled in:

Zone 0 explosive gas air mixturecontinuously present.

Zone 1 explosive gas air mixture likelyto occur in normal operation.

Zone 2 explosive gas air mixture notlikely to occur, and if it doeswill only exist for a short time.

Be used with gases in groups:Group A propaneGroup B ethyleneGroup C hydrogen

In gases that may be used with equipment havinga temperature classification of:

T1 450°CT2 300°CT3 200°CT4 135°CT5 100°C

At ambient temperatures between -40 and +70°C.

CAUTION installation in Zone 0When a BA304G or BA324G GRP instrument isinstalled in a Zone 0 potentially explosiveatmosphere requiring EPL Ga apparatus, theinstrument shall be installed such that even in theevent of rare incidents, an ignition source due toimpact or friction between the aluminium label andiron/steel is excluded.

No special conditions apply when a GRP indicatoris installed in Zone 1 or in Zone 2, or for Stainlesssteel indicators.

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This allows all the models to be installed in all gasZones and to be used with most common industrialgases except carbon disulphide and ethyl nitritewhich have an ignition temperature of 95°C.

3.3 4/20mA inputThe input safety parameters for the 4/20mA input,terminals 1 and 3 are:

Ui = 30V dcIi = 200mAPi = 0.84W

The maximum equivalent capacitance andinductance between the two 4/20mA inputterminals 1 and 3 is:

Ci = 5.4nFLi = 0.016mH (0.02mH)

The maximum permitted loop cable parameterscan be calculated by adding these figures to Ciand Li of other instruments in the loop andsubtracting the totals from the maximum cablecapacitance Co and cable inductance Lo permittedfor the Zener barrier or galvanic isolator poweringthe loop.

Although the indicators do not themselves complywith the requirements for simple apparatus, theEC-Type Examination Certificate states that forintrinsic safety considerations, under faultconditions the output voltage, current and power atterminals 1 & 3 will not exceed those specified byclause 5.7 of EN 60079-11 for simple apparatus.This simplifies the application and intrinsic safetydocumentation for a loop into which an indicator isconnected.

3.4 Certification label informationThe certification information label is fitted on thetop surface of the instrument assembly. It showsthe ATEX and IECEx certification information andBEKA associates name and location. NonEuropean certification information may also beshown. The instrument serial number and date ofmanufacture are recorded on a separate labelinside the instrument enclosure.

Typical certification label

4. SYSTEM DESIGN FOR GAS HAZARDOUS AREAS.

4.1 Transmitter loopsAll the models may be connected in series withalmost any intrinsically safe 4/20mA current loopand calibrated to display the measured variable orcontrol signal in engineering units. The indicatorsare transparent to HART ® signals.

There are three basic design requirements:

1. The intrinsic safety output parameters of the4/20mA loop, which are defined by theZener barrier or galvanic isolator poweringthe loop, must be equal to or less than:

Uo = 30V dcIo = 200mAPo = 0.84W

2. The maximum permitted cable capacitanceof the loop, defined by the Zener barrier orgalvanic isolator powering the loop, must bereduced by 5.4nF and the maximumpermitted cable inductance by 0.02mH.

3. The loop must be able to tolerate theadditional 1.2V required to operate theindicator. When fitted with an optionalbacklight this increases to 5.0V if thebacklight is loop powered. See 9.2.1

Figs 2a and 2b illustrate typical applications inwhich an indicator is connected in series with a2-wire transmitter powered by a Zener barrier andalternatively by a galvanic isolator.

Fig 2a Loop powered by a Zener barrier

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Fig 2b Loop powered by a galvanic isolator

4.2 Remote indicationAll the models may be driven via an intrinsicallysafe interface from a 4/20mA safe area signal toprovide a remote display within a hazardous area.The type of intrinsically safe interface is not critical,either a Zener barrier or a galvanic isolator may beused, providing that Ui, Ii and Pi of the indicatorare not exceeded and the voltage capability of the4/20mA signal is sufficient to drive the indicatorplus the interface.

When a high integrity earth connection is alreadyavailable, a Zener barrier is usually the leastexpensive option. If an earth connection is notavailable or isolation is required, a galvanic isolatoris the correct choice.

If one side of the 4/20mA current loop may beearthed, a single channel Zener barrier providesthe lowest cost protection. If the 4/20mA signal isnot isolated, then two Zener barriers, a twochannel Zener barrier or a galvanic isolator mustbe used. Fig 3 shows the alternative circuits whichmay be used.

Fig 3 Alternative circuits for remote indicationin a hazardous area

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5. INSTALLATION

5.1 LocationBA304G and BA324G indicators have a GRPenclosure and BA304G-SS and BA324G-SSindicators have a 316 stainless steel enclosure.Both provide IP66 ingress protection after a 7Jimpact and have a thick armoured window whichwill withstand a 4J impact. They are suitable forexterior mounting in most industrial on-shore andoff-shore installations.

The indicators should be positioned where thedisplay is not in continuous direct sunlight. Specialconditions apply for Zone 0 installations, seesection 3.2.

Field wiring terminals are located on the rear of theindicator assembly as shown in Fig 5c. Indicatorterminals 2 and 4 are internally joined and may beused for linking the return 4/20mA wire - seeFig 5c.

The indicators are surface mounting, but may bepipe mounted using one of the accessory kitsdescribed in section 9.4 or panel mounted asdescribed in section 9.5.

5.2 GRP models BA304G and BA324GThe GRP models are fitted with a bonding plate toensure electrical continuity between the twoconduit or cable entries. The bonding plate may bemounted on the inside or outside of the enclosureand includes an M4 earth stud. If the carbonloaded GRP enclosure is not bolted to an earthedpost or structure, this earth stud should beconnected to the plant potential equalisingconductor.

An insulated M4 stud is provided in the bottomright hand corner of the GRP back-box forinterconnecting cable screens.

If field wiring is to be terminated prior to theinstallation of the indicator assembly, the GRPmodels, BA304G and BA324G, can be suppliedwith an optional back-box terminal assembly,which includes a 4/20mA continuity diode. Seesection 9.6 of this manual. This option is notavailable for the stainless steel models,

5.3 Stainless steel models BA304G-SS and BA324G-SSThe stainless steel models have an earthingterminal in the lower left had side of the back-box.If the stainless steel enclosure is not bolted to anearthed post or structure, this earth terminal shouldbe connected to the plant potential equalisingconductor.An insulated M4 stud is provided in the bottomright hand corner of the stainless steel back-boxfor interconnecting cable screens.

5.4 Installation ProcedureFig 4 illustrates the instrument installationprocedure for all models.

A. Remove the indicator assembly byunscrewing the four captive 'A' screws.

B. Mount the enclosure back-box on a flatsurface and secure with screws or boltsthrough the four 'B' holes. Alternatively useone of the pipe or panel mounting kitsdescribed in sections 9.4 and 9.5.

C. Remove the temporary hole plug and installan appropriate IP and temperature ratedcable gland or conduit fitting. If two entriesare required, the IP66 stopping plug shouldbe replaced with an appropriate IP andtemperature rated cable gland or conduitfitting.

D. Connect the field wiring to the terminals asshown in Fig 5c. Replace the instrumentassembly on the back-box and evenly tightenthe four 'A' screws.

Fig 4 BA304G, BA304G-SS, BA324G and BA324G-SS installation procedure

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Fig 5a Dimensions for BA304G and BA324G.

Fig 5b Dimensions connections for BA304G-SS and BA324G-SS.

Fig 5c Terminal connections for all models.

5.5 EMCAll models comply with the requirements of theEuropean EMC Directive 2014/30/EU. Forspecified immunity all wiring should be in screenedtwisted pairs, with the screens earthed at one pointin the safe area.

An insulated stud is included in the indicator back-box for joining cable screens.

The optional back-box terminal assembly for GRPmodels, which is described in section 9.6, includesa pair of isolated linked terminals 5 and 6 forjoining cable screens.

5.6 Units of measurement and tag markingon scale card.

The indicator’s units of measurement and taginformation are shown on a scale card which slidesinto the indicator.

New indicators can be supplied with a printedscale card showing the requested units ofmeasurement and tag information for no additionalcost. If this information is not supplied when theindicator is ordered, a blank scale card will be fittedwhich can easily be marked on-site with a drytransfer or a permanent marker. Custom printedscale cards are available from BEKA associates asan accessory.

To remove the scale card from an indicatorcarefully pull the transparent tab at the rear of theindicator assembly away from the indicator asshown in Fig 6a.

Fig 6a Removing scale card

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Fig 6b Inserting scale card into the instrument assembly.

To replace the scale card carefully insert it into theslot on the right hand side of the input terminals asshown in Fig 6b. Force should be applied evenlyto both sides of the scale card to prevent ittwisting. The card should be inserted until about2mm of the transparent tab remains protruding.

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6. CONFIGURATION AND CALIBRATIONAll the models are configured and calibrated viathe four front panel push buttons. Theconfiguration functions are contained in an easy touse intuitive menu that is shown diagrammaticallyin Fig 7.

Each menu function is summarised in section 6.1and includes a reference to more detailedinformation. When the indicator is fitted withalarms additional functions are added to the menuwhich are described in section 9.3

Throughout this manual push buttons are shownas (, ), & or *, and legends are shown in aseven segment font exactly as displayed by theindicator e.g. CAL and ALr2.

Access to the configuration menu is obtained byoperating the ( and ) push buttonssimultaneously. If the indicator security code is setto the default 0000 the first parameter FunC will bedisplayed. If a security code other than the defaultcode 0000 has already been entered, the indicatorwill display CodE. Pressing the ( button will clearthis prompt allowing each digit of the code to beentered using the & and * push buttons and the( button to move control to the next digit. Whenthe correct four digit code has been enteredpressing ) will cause the first parameter FunC tobe displayed. If the code is incorrect, or a buttonis not pressed within twenty seconds, the indicatorwill automatically return to the display mode.

Once within the configuration menu the requiredparameter can be reached by scrolling through themenu using the & and * push buttons as shownin Fig 7. When returning to the display modefollowing recalibration or a change to any function,the indicator will display dAtA followed by 5AVE

while the new information is stored in permanentmemory.

All new indicators are supplied calibrated asrequested at the time of ordering. If calibration isnot requested, indicators will be supplied with thefollowing default configuration:

Default Configuration BA304G BA324G

BA304G-SS BA324G-SS

Access code CodE 0000 0000Function FunC Linear LinearDisplay at 4mA 2ero 0.0 0.00Display at 20mA 5PAn 100.0 100.00Resolution rE5n 1 digit 1 digitBargraph start BarLo ----- 0.00Bargraph finish BarHi ----- 100.00( button in display mode C--P % %Tare tArE Off Off

6.1 Summary of configuration functionsThis section summarises each of the mainconfiguration functions and includes a crossreference to a more detailed description. Fig 7illustrates the location of each function within theconfiguration menu. The lineariser and theoptional factory fitted alarms are describedseparately in sections 7 and 9.3 of this manual.

Display Summary of function

FunC Indicator functionDefines the relationship between the4/20mA input current and the indicatordisplay. May be set to:

5td Standard linear relationshiproot Square root extractionLin 16 segment adjustable

lineariser – see section 7.See section 6.2

rE5n Display resolutionDefines the resolution of the leastsignificant display digit. May be set to1, 2, 5 or 10 digits.See section 6.3

dP Decimal pointPositions a dummy decimal pointbetween any of the digits or turns it off.See section 6.4

CAL Calibration of the digital display usingan external current source.Enables the zero and span of theindicator to be adjusted using an externalcurrent source such as a calibrator.When used with an accurate traceablecurrent source this is the preferredmethod of calibration.See section 6.5

5Et Calibration of display using internalreferences.Enables the zero and span of theindicator to be adjusted without the needfor an accurate input current ordisconnection from the 4/20mA loop. Seesection 6.6

bAr Bargraph format and calibrationOnly the BA324G & BA324G-SS have abargraph.The bargraph may be conditioned to startfrom left, right or centre of the display, orit may be disabled. When optionalalarms are fitted it can also display bothalarm setpoints and the measured value. The bargraph may be calibrated to startand finish at any value within theindicator’s calibrated digital display.See section 6.7

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Display Summary of function

C--P Function of ( push buttonThe indicator may be configured todisplay the input current in milliamps, orthe input current as a percentage of the4/20mA input when the ( push button isoperated in the display mode.See section 6.8

tArE Tare functionWhen enabled the tare function sets the

indicator display to zero when the )

push button is operated in the displaymode.See section 6.9

CodE Security codeDefines a four digit numeric code thatmust be entered to gain access to theconfiguration menu. Default code 0000

disables this security function and allowsunrestricted access to all conditioningfunctions.See section 6.10

r5Et ResetContains two sub-functions, ConF whichreturns the indicator to the defaultconditions shown in section 6.0, andLtAb which returns the lineariser to thedefault conditions shown in section 7.4.To prevent accidental use both resetsmust be confirmed by entering 5urE

before they will be executed.See section 6.11

6.2 Indicator function: FunC

This configuration function defines the relationshipbetween the indicator’s 4/20mA input current andthe indicator’s display. Three alternatives areavailable:

5td Standard linear relationshiproot Square root extractionLin 16 segment adjustable lineariser

To reveal the indicator's existing function selectFunC from the configuration menu and press (.If the function is set as required, press ) to returnto the menu, or press the & or * button tochange the setting, followed by the ) button toreturn to the configuration menu.

5td LinearProvides a linear relationship betweenthe 4/20mA indicator input current andthe indicator display.

root Square root extractionPrimarily intended to linearise the squarelaw 4/20mA output from differentialflowmeters.

For reference, the following table showsthe output current from a non-lineariseddifferential flowmeter.

% of full flow Current output mA2.5 4.01

10.0 4.1625.0 5.0050.0 8.0075.0 13.00

100.0 20.00When the root function is selected theindicator will display flow in linear units.

Lin 16 segment adjustable lineariserEnables non-linear variables to bedisplayed by the indicator in linearengineering units. Use of the lineariser isdescribed in section 7 of this instructionmanual.

6.3 Resolution: rE5n

This function defines the resolution of the leastsignificant display digit. Decreasing the displayresolution can improve the readability of a noisysignal. Select rE5n from the menu and press( which will reveal the current display resolution.To change the resolution press the & or *

button to select 1, 2, 5 or 10 digits, followed by the) button to enter the selection and return to theconfiguration menu.

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6.4 Position of the decimal point: dP

A dummy decimal point can be positioned betweenany of the digits or it may be absent. To positionthe decimal point select dP from the menu andpress (. The decimal point can be moved bypressing the & or * push button. If a decimalpoint is not required it should be positioned beyondthe most or least significant digit. Whenpositioned as required press the ) button to enterthe selection and return to the configuration menu.

6.5 Calibration using an externalcurrent source: CAL

This function enables the zero and span of theindicator to be adjusted using an externalcalibrated current source. When used with anaccurate traceable current source this is thepreferred method of calibration.

Zero is the indicator display with 4mA inputSpan is the indicator display with 20mA input

To calibrate the indicator select CAL from theconfiguration menu and press (. The indicatorwill display 2Ero which is a request for a 4mA inputcurrent. Adjust the external current calibrator to4.000mA and again press ( which will reveal thecurrent zero display. The flashing digit of theindicator display can be changed by pressing the& or * buttons, when set as required pressing( will transfer control to the next digit. When allthe digits have been adjusted, press ) to enterthe new zero and return to the 2Ero prompt .

Pressing the * button will cause the indicator todisplay 5PAn which is a request for a 20mA inputcurrent. Adjust the external current calibrator to20.000mA and again press ( which will revealthe existing span display. The flashing digit of theindicator display can be changed by pressing the& or * buttons, when set as required pressing( will transfer control to the next digit. When allthe digits have been adjusted press ) to enterthe new span and return to the 5PAn prompt.Finally press ) again to return to theconfiguration menu.

Notes:a. The indicator input current must be adjusted to

the required value before the zero and spanfunctions are entered by pressing the( button.

b. Indicators may be calibrated at currents otherthan 4 and 20mA, within the range 3.8 to21.0mA providing the difference between thetwo currents is greater than 4mA. If theseconditions are not complied with, the indicatordisplays FaiL and aborts the calibration.

c. If the zero current is greater than the spancurrent the instrument will be reverse acting i.e.an increasing input current will cause thedisplay to decrease.

6.6 Calibration using internal reference: 5Et

Using the 5Et function the indicator can becalibrated without the need to know the value ofthe 4/20mA input current, or to disconnect theindicator from the 4/20mA loop.

When using the 5et function the indicator’s internalreference is used to simulate a 4mA and 20mAinput current.

Zero is the display with a simulated 4mA inputSpan is the display with a simulated 20mA input

To calibrate the indicator display select 5Et fromthe configuration menu and press (. Theindicator will display 2Ero, pressing ( again willreveal the current display at 4mA. The flashingdigit can be adjusted by pressing the & or *

buttons, when the flashing digit is correct pressing( will transfer control to the next digit. When allthe digits have been adjusted, press ) to returnto the 2Ero prompt.

To adjust the display at 20mA, press the * buttonwhich will cause the indicator to display 5PAn,pressing ( will then reveal the indicator’s existingdisplay at 20mA. The flashing digit can beadjusted by pressing the & or * buttons, whenthe flashing digit is correct pressing ( will transfercontrol to the next digit. When all the digits havebeen adjusted press ) to return to the 5PAn

prompt followed by ) to return to the 5Et promptin the configuration menu.

6.7 Bargraph format and calibration: bAr

Only the BA324G and BA324G-SS have abargraph.

In addition to a five digit numerical display theBA324G has a 31 segment analogue bargraphwhich may be configured to start and finishanywhere within the indicator’s numerical displayrange.

To configure the bargraph select bAr from theconfiguration menu and press (. The indicatorwill display tYPE, pressing ( again will reveal theexisting bargraph justification which can bechanged to one of the following four or five optionsusing the & or * button:

Bargraph justification starts fromLEFt Left end of displayCEntr Centre of displayriGHT Right end of displayAlr5P Only with alarms - see section 9.3.14oFF Bargraph disabled

When set as required press ) to return to thetYPE sub-function prompt.

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The indicator’s digital display at which thebargraph starts is defined by the bArLo sub-function which is selected by pressing the *

button followed by the ( button which will revealthe current indicator display at which the bargraphstarts. The flashing digit can be adjusted bypressing the & or * buttons, when set asrequired pressing ( will transfer control to thenext digit. When all the digits have been adjusted,press ) to return to the bArLo prompt from whichbArHi which defines the finishing point of thebargraph can be selected by pressing the *

button. bArHi is adjusted in the same way asbArLo. When set as required, pressing ) twicewill return the display to the bAr prompt in theconfiguration menu.

Note: bArLo must be set lower than bArHi,incorrect setting is indicated by the bargraph scaleflashing with a single bargraph segment activated.

6.8 Function of the ( push-button: C--P

When the indicator is in the display mode,operating the ( push button will display the inputcurrent in milliamps, or the displayed value as apercentage of the difference between thedisplayed values at 4mA and 20mA inputs.

To check or change the function of the ( pushbutton select C--P from the configuration menuand press ( to reveal the current setting.Pressing the & or * button will toggle the settingbetween 4-20 the current display in milliamps andPC the percentage display. When set as requiredpress ) to return to the C--P prompt in theconfiguration menu.

6.9 Tare function: tArE

The tare function is primarily intended for use witha weighing system. When the indicator is in thedisplay mode and the tare function is activated,pressing the ) button for more than threeseconds will zero the indicator’s digital display andactivate the tare annunciator. On the BA324G andBA324G-SS, the bargraph remains linked to thedigital display when the tare function is activated.Subsequent operation of the ) push button forless than 3 seconds will return the indicator to thegross display and deactivate the tare annunciator.

To check or change the tare function select tARE

from the configuration menu and press ( toreveal the current setting. Pressing the & or *

button will toggle the setting between on and oFF.When set as required press ) to return to thetARE prompt in the configuration menu.

6.10 Security code: CodE

Access to the instrument configuration menu maybe protected by a four digit security code which

must be entered to gain access. New instrumentsare configured with the default security code 0000

which allows unrestricted access to allconfiguration functions.

To enter a new security code select CodE from theconfiguration menu and press ( which will causethe indicator to display the existing security codewith one digit flashing. The flashing digit can beadjusted using the & or * push buttons, whenset as required operating the ( button willtransfer control to the next digit. When all thedigits have been adjusted press ) to return to theCodE prompt in the configuration menu. Therevised security code will be activated when theindicator is returned to the display mode. Pleasecontact BEKA associates sales department if thesecurity code is lost.

6.11 Reset to factory defaults: r5Et

This function enables the indicator and thelineariser to be quickly returned to the factorydefault configurations shown in sections 6.0 and7.4.

To reset the indicator or lineariser select r5Et fromthe configuration menu and press (, the indicatorwill display one of the reset options ConF or LtAb.

ConF Resets the indicator to defaultsLtAb Resets the lineariser to defaults

Using the & or * push button select therequired sub-function and press (. To preventaccidental resetting the request must be confirmedby entering 5urE. Using the * button set the firstflashing digit to 5 and press ( to transfer controlto the second digit which should be set to u.When 5urE has been entered pressing the )

button will reset the selected configuration menusand return the display to the r5Et function in theconfiguration menu.

6.12 Under and over-rangeIf the numerical display range of the indicator isexceeded, all the decimal points will flash asshown below:

BA304G BA324G BA304G-SS BA324G-SS

Underrange -9 . 9 . 9 . 9 -9 . 9 . 9 . 9 . 9

Overrange 9 . 9 . 9 . 9 9 . 9 . 9 . 9 . 9

Although not guaranteed, most indicators willcontinue to function normally with an input currentbetween 1.8mA and 4mA, at lower currents theinstrument will display LPLo before it stopsfunctioning.

Under or over-range of the BA324G and theBA324G-SS bargraph is indicated by a flashingarrow at the appropriate end of the bargraph.

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7. LINEARISERA sixteen segment, seventeen break-point (0 to 16)lineariser may be selected in the FunC section ofthe configuration menu. The position of eachbreak-point is fully adjustable so that the slope ofthe straight line between break-points can be set tocompensate for input non-linearity, thus allowingthe indicator to display non-linear processvariables in linear engineering units. Each break-point must occur at a current greater than thepreceding break-point and less than the followingbreak-point, in the range 3.8 to 21.0mA. If thisrequirement is not observed when configuring thelineariser the indicator will display FaiL and theconfiguration adjustment which produced the errormessage will be ignored. Fig 8 shows a typicallinearised indicator characteristic.

Fig 8 shows a typical linearising characteristic

Selecting Lin in the FunC section of theconfiguration menu activates the lineariser, thisdoes not change the configuration menu shown inFig 7, but the CAL and 5Et functions are extendedas shown in Fig 9. As with a linear indicator,calibration of the lineariser may be performed withan external current source using the CAL function,or with the internal reference using the 5Et

function.

The lineariser calibration is retained irrespective ofhow the indicator function FunC is subsequentlychanged. It is therefore possible to select anddeselect the lineariser without having toreconfigure it each time.

The lineariser calibration may be reset to thefactory default settings without changing theindicator configure using the LtAb functiondescribed in section 6.11.

7.1 Lineariser calibration using an externalcurrent source.

This method allows direct calibration of thelineariser with an external current source and isthe preferred method when traceability is required.If the exact system non-linearity is unknown, thismethod also allows direct calibration from thevariable to be displayed. e.g. the output from alevel sensor in an irregular tank may be displayedin linear volumetric units by filling the tank withknown incremental volumes and calibrating theindicator to display the sum of the increments ateach break-point.

The number of break-point required should first beentered using the Add and dEL functions. In boththese sub-functions the indicator initially displaysthe current break-point and the total number ofbreak-points being used as shown below.

Display Summary of function

Add Add a break-pointAdds a new break-point before thedisplayed break-point. The calibration ofexisting break-points is not changed, butthe identification number of allsubsequent break-points is increased byone.

dEL Remove a break-pointRemoves the displayed break-point andjoins the preceding break-point to thefollowing break-point with a straight line.The identification number of allsubsequent break-points is decreased byone.

To add a break-points use the & or * button toselect CAL from the configuration menu and press( which will result in the Add sub-function promptbeing displayed. To enter the sub-function press( which will reveal the current break-point andthe total number of break-points which havealready been entered. When adding a break-pointthe insertion position can be selected using the &

and * push buttons followed by ( push buttonto insert the additional break-point. In previouslyuncalibrated linearisers each new break-pointshould be added in front of the highest existingbreak-point, if this sequence is not followed a FaiL

message will occur in the Pt5 function. Seeexample in section 7.1.1.

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The delete break-point sub-function dEL operatesin exactly the same way as the Add sub-functiondescribed above. Once within the dEL sub-function each time the ( button is pressed abreak-point is removed. When deleting a break-point from a calibrated indicator, the break-point tobe deleted can be selected using the & and *

push buttons. The minimum number of break-points is 2, break-points 0 :1 and 1 :1.

When the required number of linearising break-points has been entered, return to the linearisationsub-menu by pressing ). The indicator willdisplay the Add or dEL prompt depending upon thelast function used. Using the Pt5 sub-function theinput current at which each break-point occurs andthe corresponding indicator display may now bedefined.

Using the & or * button select the Pt5 functionin the sub-menu and press ( to enter the functionwhich will display the first break-point 0 : n, where n

is the total number of linearising break-pointsentered - see Fig 9. The selected linearisingbreak-point can be changed using the & and *

buttons. When the required linearising break-pointhas been selected set the indicator input current tothe exact value at which the break-point is requiredand press (*. Using the & and * buttons andthe ( button to move between digits, enter therequired indicator display at this break-point.When set as required, press the ) push button toenter the required indicator display and return tothe sub-menu from which the next break-point canbe selected.

When all the break-points have been calibratedpressing ) twice will return the indicator to the‘CAL’ function in the configuration menu.

Note: * The indicator input current must beadjusted to the required value before the( button is operated to enter the requiredindicator display.

Error messageIf during calibration the indicator displaysa FAiL error message the current at whichthe selected break-point is being set is notabove the proceding break-point or is notbelow the following break-point.

7.1.1 ExampleAdding break-points to a new indicator

When adding break-points to a new indicator, or toa lineariser following resetting to the factorydefaults using the LtAb function described insection 6.11, each additional break-point should beadded before the highest existing breakpoint.The first additional break-point should be addedbefore the default break-point 1 :1 which will resultin a display of 1 : 2. If more new break-points are

required, using the * button select the newhighest break-point 2 : 2 and add the secondadditional break-point by operating the ( pushbutton which will result in a display of 2 : 3. Repeatthe sequence until the required number of break-points has been entered.

The input current and at which each break-pointoccurs and the corresponding indicator displaymay now be entered as described above.

7.2 Lineariser calibration using the internalreference.

The 5Et function enables the lineariser to becalibrated without the need for an accurateexternal current source. Throughout thecalibration the indicator input current may be anyvalue between 4 and 20mA.

The 5Et functions contains four sub-functions.

Display Summary of function

Add Add a break-pointAdds a new break-point before thedisplayed break-point. The calibration ofexisting break-points is not changed, butthe identification number of allsubsequent break-points is increased byone.

dEL Remove a break-pointRemoves the displayed break-point andjoins the preceding segment to thefollowing segment with a straight line.The identification number of allsubsequent break-points is decreased byone.

in Defines the current at which break-pointoccurs.Enables the required current at eachbreak-point to be defined without havingto input an accurate input current to theindicator.

di5P Defines indicator display at break-point.Enables the indicator display at eachbreak-point to be defined.

The number of break-points required should firstbe entered using the Add and dEL sub-functions.In both these sub-functions the indicator initiallydisplays the current break-point and the totalnumber of break-points being used as shownbelow.

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To add a break-point using the & or * buttonselect 5Et from the configuration menu and press( which will result in the Add sub-function promptbeing displayed. To enter the sub-function press( which will reveal the current break-point andthe total number of break-points which havealready been entered. When adding a break-pointthe insertion position can be selected using the &

and * push buttons followed by ( push buttonto insert the additional break-point. In previouslyuncalibrated linearisers each new break-pointshould be added in front of the highest existingbreak-point, if this sequence is not followed a FaiL

message will occur when the break-points arecalibrated. See example in section 7.2.1.

The delete a break-point, sub-function dEL

operates in exactly the same way as the Add sub-function described above. Once within the dEL

function each time the ( button is pressed abreak-point is removed. When deleting a break-point from a calibrated indicator, the break-point tobe deleted can be selected using the & and *

push buttons. The minimum number of break-points is 2, break-points 0 :1 and 1 :1.

When the required number of linearising break-points has been entered, return to the linearisationsub-menu by pressing ). The indicator willdisplay the Add or dEL prompt depending upon thelast sub-function used. The indicator input currentand corresponding indicator display at each break-point, which is the segment finishing point asshown in Fig 9, can now be entered using the in

and di5P sub-functions.

Using the & or * button select in from the sub-menu and press ( which will reveal the startingpoint for the first segment 0 : n, where n is the totalnumber of break-points entered. Press ( and usethe & and * buttons and the ( button to movebetween digits, to enter the input current inmilliamps at which the first break-point is required,usually 4.000mA. When set as required, press )

to return to the 0 : n prompt from which the nextbreak-point can be selected using the & and *

buttons. When the required break-point has beenselected press ( and enter the indicator inputcurrent at which this break-point is required usingthe & and * buttons and the ( button to movebetween digits. Repeat this procedure until theindicator input current at all the break-points hasbeen defined and then return to the in sub-function by pressing the ) button.

The corresponding indicator display at each of thebreak-points can now be defined using the di5P

sub-function. Using the & and * buttons selectthe di5P sub-function and press ( which willreveal the starting point for the first break-point 0 : n,where n is the total number of break-pointsentered.

Press ( and use the & and * buttons and the( button to move between digits, to enter therequired indicator display at the first break-point.When set as required, press ) to return to the 0 : n

prompt from which the next break-point can beselected using the & or * buttons. When therequired break-point has been selected press( and set the required indicator display at thisbreak-point.

Repeat this procedure until the indicator display atall the break-points has been defined and thenreturn to the 5Et function in the configuration menuby pressing the ) button twice.

Error messageIf during calibration the indicator displaysa FAiL error message the current at whichthe selected break-point is being set is notabove the proceding break-point or is notbelow the following break-point.

7.2.1 ExampleAdding break-points to a new indicator

When adding break-points to a new indicator, or toa lineariser following resetting to the factorydefaults using the LtAb function described insection 6.11, each additional break-point should beadded before the highest existing breakpoint.The first additional break-point should be addedbefore the default break-point 1 :1 which will resultin a display of 1 : 2. If more new break-points arerequired, using the * button select the newhighest break-point 2 : 2 and add the secondadditional break-point by operating the ( pushbutton which will result in a display of 2 : 3. Repeatthe sequence until the required number of break-points has been entered.

7.3 Under and over-rangeThe lineariser does not change the under andover-range indication described in section 6.12. Atinput currents below that specified for the firstbreak-point 0 : n, the indicator will continue to usethe specified slope of the first segment.

At input currents above that specified for the lastbreak-point n : n, the indicator will continue to usethe slope specified for the last lineariser segment.

7.4 Lineariser default configurationWhen the lineariser is reset to the factory defaultsusing the LtAb function described in section 6.11,the defaults conditions are:

Indicator displayBA304G BA324G

BA304G-SS BA324G-SS First break-point 0 :1 4mA 0.0 0.00 Second break-point 1 :1 20mA 100.0 100.00

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8. MAINTENANCE

8.1 Fault finding during commissioningIf an indicator fails to function duringcommissioning the following procedure should befollowed:

Symptom Cause Solution

No display Incorrect wiring

Check wiring

There should be 0.6 to 1.2V between terminals 1 & 3 with terminal 1 positive.

With an optional backlight loop powered, there should be 3.4 to 5Vbetween terminals 3 & 12 with terminal12 positive.

No display0V between terminals 1 & 3.

Incorrect wiring or no power supply

Check supply voltage and voltagedrop caused by all the instruments in the loop.

All decimal pointsflashing.

Overrange or underrange if -ve sign is displayed.

Recalibrate the numerical display.

Unstable display 4/20mA input is noisy.

Eliminate ripple on 4/20mA power supply and/or decrease indicator resolution.

Unable to enter configuration menu.

Incorrect security code entered.

Enter correct security code, or contact BEKA if the code has been lost.

8.2 Fault finding after commissioning

ENSURE PLANT SAFETY BEFORESTARTING MAINTENANCE

Live maintenance is permitted onintrinsically safe equipment installed in agas hazardous area, but only certified testequipment should be used unless a gasclearance certificate is available.

If an indicator fails after it has been functioningcorrectly, follow the procedure shown in section8.1. If this does not reveal the cause of the fault, itis recommended that the instrument is replaced.This can be done without disconnecting power, butwhile the indicator is disconnected the 4/20mAloop will be open circuit.

8.3 ServicingAll BA304G, BA304G-SS, BA324G andBA324G-SS loop powered indicators areinterchangeable if the required optional backlightand alarms are fitted. A single spare instrumentmay quickly be recalibrated to replace anyinstrument that is damaged or fails. No attemptshould be made to repair instruments atcomponent level.

We recommend that faulty instruments arereturned to BEKA associates or to yourlocal BEKA agent for repair.

8.4 Routine maintenanceThe mechanical condition of the instrument andelectrical calibration should be regularly checked.The interval between inspections depends uponenvironmental conditions.

8.5 GuaranteeIndicators which fail within the guarantee periodshould be returned to BEKA associates or our localagent. It is helpful if a brief description of the faultsymptoms is provided.

8.6 Customer commentsBEKA associates is always pleased to receivecomments from customers about our products andservices. All communications are acknowledgedand whenever possible, suggestions areimplemented.

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9. ACCESSORIES9.1 Units of measurement & instrument

identification.New indicators are supplied with a printed scalecard showing the units of measurement and taginformation specified when the instrument wasordered. If this information was not supplied ablank scale card will be supplied which can easilybe marked on-site with a dry transfer or apermanent marker.

Custom printed scale cards are available asaccessories and may be easily fitted as shown insection 5.6 of this manual.

All models can also be supplied with a blank orcustom laser engraved stainless steel legend plate- see Figs 5a and 5b. The plate, which afterinstallation is visable from the front of theinstrument, is supplied loose with two fixing screwsfor securing it to the rear of the instrument's back-box. This plate can typically accommodate:

1 row of 5 alphanumeric characters 10mm high

or 1 row of 6 alphanumeric characters 7mm high

or 2 rows of 10 alphanumeric characters 5mm high

9.2 Display backlightAll models can be supplied with a factory fittedbacklight that may be loop or separately powered.

When loop powered the backlight produces greenbackground illumination enabling the display to beread at night or in poor lighting conditions. Noadditional power supply, intrinsic safety interface orfield wiring are required, but the indicator voltagedrop is increased. When separately powered thebacklight is brighter, but an additional intrinsicsafety interface and field wiring are required.

Fig 10 Terminals for optional backlight

9.2.1 Loop powering the backlightThe backlight is loop powered by connecting it inseries with the indicator’s 4/20mA input as shownin Fig 11, which increases the maximum indicatorvoltage drop from 1.2 to 5V.

Fig 11 Backlight loop powered

The input intrinsic safety parameters of thecombined indicator and backlight are the same asfor the indicator alone. The EC-Type ExaminationCertificate states that for intrinsic safetyconsiderations, under fault conditions the outputvoltage, current and power of the combinedindicator and backlight terminals 12 & 3 will notexceed those specified by clause 5.7 ofEN 60079-11 for simple apparatus, whichsimplifies system design and documentation.

Providing the increased voltage drop can betolerated the intrinsic safety and system designdescribed in sections 3 and 4 of this manualremain valid with the backlight loop powered.

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9.2.2 Separately powering the backlightThe optional backlight may also be powered from aseparate safe area power supply via anintrinsically safe interface as shown in Fig 12.

Fig 12 Backlight separately powered

When separately powered the backlight draws aconstant current providing the supply is equal to orgreater than the minimum specified voltage.Below this supply voltage the backlight continuesto function but with reduced brilliance.

Current Minimum voltageAll models 34.7mA 11V

Any certified Zener barrier or galvanic isolator maybe used, providing the output parameters do notexceed:

Uo = 30V dc Io = 200mAPo = 0.84W

The internal capacitance Ci between terminals 12& 14 should be subtracted from Co of theintrinsically safe interface powering the backlight todetermine the maximum permissible cablecapacitance.

Ci = 3.3nF Ii = 0.008mH (0.01mH)

9.3 AlarmsCAUTION

These alarms outputs should not be usedfor critical safety applications such as anemergency shut down system.

Both models can be supplied with factory fitteddual solid state, single pole alarm outputs. Eachalarm output may be independently configured asa high or low alarm with a normally open ornormally closed output in the non-alarm condition.

When the 4/20mA current powering the indicator isremoved both alarm outputs will open irrespectiveof configuration. The open circuit condition shouldtherefore be chosen as the alarm condition whendesigning an alarm system. Fig 13 illustrates theconditions available and shows which are fail safe.

When an alarm occurs an alarm annunciator onthe indicator front panel is activated and if requiredthe numerical display can alternate between themeasured value and the alarm channelidentification ALr1 or ALr2.

CAUTIONThe alarms are activated by the indicator’snumerical display. Use of the TareFunction tArE will change the numericaldisplay, the alarms will continue tofunction at the original displayed value,but this will correspond to a different inputcurrent.

Fig 13 Alarm outputs

Configurable functions for each alarm includeadjustable setpoint, hysteresis, alarm delay andalarm accept.

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9.3.1 Solid state outputEach alarm has a galvanically isolated single polesolid state switch output as shown in Fig 14. Theoutput is polarised and current will only flow in onedirection.

Ron = less than 5Ω + 0.7VRoff = greater than 1MΩ

Fig 14 Equivalent circuit of each alarm output

9.3.2 Intrinsic safetyEach alarm output is a separate galvanicallyisolated intrinsically safe circuit. The EC-TypeExamination Certificate states that for intrinsicsafety considerations, under fault conditions theoutput voltage, current and power at terminals 8 &9 and 10 & 11 will not exceed those specified byclause 5.7 of EN 60079-11 for simple apparatus.This simplifies system documentation and allowsthe alarm output terminals 8 & 9 and 10 & 11 to beconnected to almost any intrinsically safe circuitprotected by a Zener barrier or galvanic isolatorproviding the output parameters of the circuit donot exceed:

Uo = 30V Io = 200mAPo = 0.84W

The maximum equivalent capacitance andinductance between each set of alarm terminals is:

Ci = 0Li = 0.008mH (0.01mH)

The maximum allowable cable capacitance will bethe same as that permitted by the certificate for thedevice powering the alarm circuit, such as thesolenoid driver or switch transfer galvanic isolatorsshown in Fig 15. The maximum permitted cableinductance will be that specified for the devicepowering the alarm circuit less 0.01mH.

Fig 15 Typical alarm application(Shown without recommended screened cables)

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9.3.3 Configuration and adjustmentWhen optional alarms are fitted to a loop poweredindicator the configuration menu is extended asshown in Fig 16. The additional functions appearbetween the 5Et and the C--P functions for theBA304G and between bAr and C--P for theBA324G indicator. For simplicity, Fig 16 onlyshows the additional functions for alarm 1, butalarm 2 has identical functions.

The following table summarises each of the alarmconfiguration functions and includes a crossreference to more detailed information. Again onlythe functions on Alarm 1 are listed, but alarm 2 hasidentical facilities.

Summary of alarm configuration functions

Display Summary of function

EnbL Alarm enableEnables or disables the alarm withoutchanging the alarm parameters.See section 9.3.4

5P1 Alarm setpoint 1Adjusts the alarm setpoint. The alarm isactivated when the indicator displayequals the setpoint.See section 9.3.5

Hi. Lo Alarm functionDefines the alarm function as High orLow.See section 9.3.6

no . nC Normally open or normally closedoutputSets the alarm output open or closed inthe non-alarm condition.See section 9.3.7

H5tr HysteresisAdjusts the alarm hysteresis.See section 9.3.8

dELA Alarm delay timeIntroduces adjustable delay between thedisplay equalling the setpoint and thealarm output being activated. See section 9.3.9

5iL Alarm silence timeDefines the time that the alarm outputremains in the non-alarm conditionfollowing acceptance of an alarm.See section 9.3.10

FL5H Flash display when alarm occursWhen enabled, alternates the numericaldisplay between process value and alarmreference, ALr1 or ALr2, when an alarmoutput is activated.See section 9.3.11

AC5P Access setpointSub-menu which enables direct accessto the alarm setpoints from the indicatordisplay mode, and defines a separatesecurity code.See section 9.3.12

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9.3.4 Alarm enable: EnbL

This function allows each alarm to be enabled ordisabled without altering any of the alarmparameters. To enable or disable the alarm selectEnbL from the alarm menu and press ( which willreveal the current setting on or oFF. The functioncan be changed by pressing the & or * buttonfollowed by the ) button to return to the alarmmenu.

9.3.5 Setpoint adjustment: 5P1 and 5P2

The setpoint of each alarm may be positionedanywhere in the numerical display of the indicatorproviding that this corresponds to an input currentbetween 3.8 and 20.2mA. e.g. If the indicator hasbeen calibrated to display 0 with 4mA input and10000 with 20mA input, the two alarm setpointsmay be positioned anywhere between -125 and10125.To adjust the setpoint select 5P1 or 5P2 from thealarm configuration menu and press ( which willreveal the existing alarm setpoint. The flashingdigit of the setpoint can be adjusted using the &

and * push-buttons, and the ( button to movecontrol to the next digit. When the requiredsetpoint has been entered press ) to return tothe alarm configuration menu.The alarm setpoints may also be adjusted whenthe indicator is in the display mode, see section9.3.12.

9.3.6 Alarm function: Hi . Lo

Each alarm can be independently configured as ahigh alarm or as a low alarm. To check or changethe alarm function select Hi . Lo from the alarmmenu and press ( to reveal the current setting.The function can be changed by pressing the &

or * button followed by the ) button to return tothe alarm menu.

9.3.7 Alarm output status: no . nC

Configures the solid state alarm output to be openno or to be closed nC in the non-alarm condition.When deciding which is required, care should betaken to ensure that the alarm output is fail safe asillustrated in Fig 13.

no Alarm output open in non-alarm condition

nC Alarm output closed in non-alarm condition

CAUTIONWhen the 4/20mA supply is removed fromthe loop powered indicator, both alarmoutputs will open irrespective ofconditioning. Therefore for fail safeoperation both alarm outputs should beconditioned to be open in the alarmcondition nC.

To check or change the alarm output status, selectno . nC from the alarm configuration menu and press( to reveal the setting. The function may bechanged by pressing the & or * button followedby the ) button to return to the alarmconfiguration menu.

9.3.8 Hysteresis: H5tr

Hysteresis is shown in the units that the indicatorhas been calibrated to display.To adjust the hysteresis select H5tr from the alarmmenu and press ( which will reveal the existingfigure. The flashing digit can be adjusted usingthe & and * push-buttons, and the ( buttonwill move control to the next digit. When therequired hysteresis has been entered press ) toreturn to the alarm configuration menu.

e.g. An indicator calibrated to display 0 to 10000,with a high alarm set at 9000 and hysteresis of 200will perform as follows:

The high alarm will be activated when increasingindicator display equals 9000, but will not resetuntil the indicator display falls below 8800.

9.3.9 Alarm delay: dELA

This function delays activation of the alarm outputfor an adjustable time following the alarm conditionoccurring. The delay can be set in 1 secondincrements between 0 and 3600 seconds. If adelay is not required zero should be entered. Toadjust the delay select dELA from the alarmconfiguration menu and press ( which will revealthe existing delay. The flashing digit of the delaycan be adjusted using the & and * pushbuttons, and the ( button to move control to theother digits. When the required delay has beenentered press ) to return to the alarm menu.

e.g. An indicator with a high alarm set at 9000 andan alarm delay of 30 seconds will perform asfollows:

The alarm annunciator will start to flash when anincreasing indicator display equals 9000, but thealarm output will not be activated until the alarmcondition has existed continuously for 30 seconds.When the alarm output is activated, the alarmannunciator will stop flashing and be permanentlyactivated.

If the FL5H function, which flashes the indicatordisplay when an alarm occurs, has been enabled,it will not start to function until the alarm output isactivated. See section 9.3.11

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9.3.10 Alarm silence time: 5iL

This function is primarily intended for use in smallinstallations where the alarm output directlyoperates an alarm annunciator such as a sounderor beacon. When the alarm silence time, which isadjustable between 0 and 3600 seconds in 1second increments, is set to any figure other thanzero, the ( push button becomes an alarmaccept button. After an alarm has occurred,operating the ( button will cause the alarm outputto revert to the non-alarm condition for theprogrammed alarm silence time. If the alarmcondition still exists at the end of the silence time,the alarm output will be reactivated. During thesilence time the indicator alarm annunciator willflash until the silence time expires or the alarm iscleared.

If the FL5H function, which flashes the indicatordisplay when an alarm occurs has been enabled, itwill only function when the alarm output isactivated, not during the silence time. See section9.3.11

To adjust the alarm silence time select 5iL fromthe alarm configuration menu and press ( whichwill reveal the existing silence time. The flashingdigit of the silence time can be adjusted using the& and * push buttons, and the ( button tomove control to the other digits. When therequired silence time has been entered press )

to return to the alarm menu.

9.3.11 Flash display when alarm occurs: FL5H

In addition to the two alarm annunciators on thetop left hand corner of the indicator display whichshow the status of both alarms, this functionprovides an even more conspicuous indication thatan alarm condition has occurred.

When enabled, the function alternates the indicatordisplay between the numerical value and the alarmreference, ALr1 or ALr2, when the alarm output isactivated. If both alarm outputs are activated, thealarm references are displayed in sequence.

To enable or disable the function select FL5H fromthe alarm menu and press ( which will reveal thecurrent setting on or oFF. The function canchanged by pressing the & or * button followedby the ) button to return to the alarm menu.

9.3.12 Access setpoint in display mode: AC5P

This function enables a separate menu providingaccess to the alarm setpoints from the displaymode by simultaneously operating the ( and *

push buttons. An operator can therefore adjust thealarm setpoints without having access to theindicator configuration menu. Protection againstaccidental adjustment of the setpoints when theindicator is in the display mode is provided by aseparate security code.

This direct setpoint access menu is enabled andthe separate security code entered from the AC5P

function in the alarm configuration menu as shownin Fig 16. To change the menu parameters selectAC5P from the configuration menu and press( which will display the enable prompt EnbL.Press ( again to reveal if the direct access menuis on or oFF. The & or * button will toggle thedisplay between the two conditions.

If oFF is selected, the operator will not have accessto the setpoints from the display mode. Return tothe AC5P prompt in the main menu by pressing )

twice.

If on is selected, the operator will have directaccess to the alarm setpoints from the displaymode via a separate optional security code. Todefine this four digit security code press ( toreturn to the Enbl prompt followed by the & or *

button to select the access code prompt ACCd.Pressing ( will reveal the current security code.Each digit of the code may be changed byoperating the & and * push buttons, and the (

button to move control to the next digit. When therequired code has been entered, press ) twice toreturn to the AC5P prompt in the configurationmenu.

Default code 0000 will disable the security codeallowing direct access to the setpoints in thedisplay mode by pressing the ( and * buttonssimultaneously. Unless otherwise requested newinstruments with alarms are supplied with thisfunction disabled and the security code set to0000.

9.3.13 Adjusting alarm setpoints from thedisplay mode.

Access to the alarm setpoints from the indicatordisplay mode is obtained by operating the ( and* push buttons simultaneously as shown in Fig17. If the setpoints are not protected by a securitycode the alarm setpoint prompt 5P1 will bedisplayed. If the setpoints are protected by asecurity code, Code will be displayed first.Pressing ( again will enable the alarm securitycode to be entered digit by digit using the & and* buttons to change the flashing digit, and the (

push button to move control to the next digit. If thecorrect code is entered pressing ) will causealarm setpoint prompt 5P1 to be displayed.Pressing the & or * button will toggle thedisplay between the two alarm setpoint prompts5P1 and 5P2.

If an incorrect security code is entered, or a buttonis not pressed within twenty seconds, the indicatorwill automatically return to the display mode.

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Fig 17 Setpoint adjustment from the display mode

To adjust an alarm setpoint select 5P1 or 5P2 andpress ( which will reveal the current setting.Each digit of the setpoint may be adjusted usingthe & and * push buttons, and the ( button tomove control to the next digit. When the requiredsetpoint has been entered, pressing ) will returnthe display to the 5P1 or 5P2 prompt from which theother setpoint may be selected, or the indicatormay be returned to the display mode by pressing) again.

Note: With the indicator in the display mode, directaccess to the alarm setpoints is only availablewhen the AC5P menu is enabled - see section9.3.12

9.3.14 Displaying setpoints on BA324G andBA324G-SS bargraph

One of the selectable bargraph formats Alr5P

allows a low or a high setpoint plus the displayedvalue to be represented, or a low and a highsetpoint plus the displayed value to be representedby the bargraph as shown in Fig 18.

Fig 18 Displayed value and setpoints on bargraph

The bargraph area below the low alarm setpointand the area above the high alarm setpoint areactivated. The displayed variable is representedby an activated bar which moves between theselow and high alarm setpoints.

When the activated bar representing the displayedvariable is adjacent to the area representing thelow or high alarm setpoints, the bar flashes.When a displayed variable equals the low or highalarm the complete bargraph representing theactivated alarm flashes irrespective of whether thealarm output has been delayed or cleared.

For this function to operate 5P1 must beconditioned as a low alarm and 5P2 as a highalarm; 5P1 must always be less than 5P2.Incorrect configuration is shown by a flashingbargraph scale with no activated bars.

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9.4 Pipe mounting kitThe BA393G is a 316 stainless steel kit which willsecure any of the indicators to a horizontal orvertical pipe with an outside diameter between 40and 73mm.

Detailed assembly instructions are supplied witheach BA393G pipe mounting kit.

9.5 Panel mounting kitsThree panel mounting kits are available forsecuring field mounting indicators in a panelaperture. Detailed assembly instructions aresupplied with each panel mounting kit.

9.5.1 BA394GThe BA394G kit, which consists of two 316stainless steel brackets, will secure any one of thefour models into a panel aperture. The kit does notseal the joint between the panel and the instrumentand is intended for mounting an indicator onto anopen panel.

9.5.2 BA494GThe BA494G panel mounting kit is manufacturedfrom the same carbon loaded GRP material as theGRP indicator enclosure. It provides an IP66 sealbetween the instrument panel and the indicatorand is therefore suitable for mounting a BA304G ora BA324G in a sealed panel enclosure.

The BA494G has ATEX and IECEx intrinsic safetycertification ITS17ATEX202599X andIECEx ITS 17.0051X confirming that use of the kitdoes not invalidate the intrinsic safety of theindicator.

9.5.3 BA494G-SSThe BA494G-SS panel mounting kit is a gasketassembly which enables a BA304G-SS or aBA324G-SS stainless steel indicator to bemounted into a panel aperture. The kit providesan IP66 seal between the indicator and theinstrument panel, it is therefore suitable formounting a stainless steel indicator in a sealedpanel enclosure.

9.6 Back-box terminal assemblyThis factory fitted option is only available forBA304G and BA324G indicators which have aGRP enclosure.

If it is necessary to terminate the field wiring priorto the installation of the indicator display, a back-box terminal assembly is available as a factoryfitted option for the BA304G and BA324Gindicators. This accessory includes terminals forthe field wiring and diodes which maintain thecontinuity of the 4/20mA loop when the indicatordisplay is unplugged.

When the indicator display is unplugged from theback-box, the voltage drop introduced into the4/20mA loop by the instrument increases to 5V. Ifan optional backlight is fitted and connected forloop powering, the voltage drop increases to 11.5Vwhen the indicator display is unplugged. Thisvoltage drop can be reduced to 7.5V by connectinga 7.5V Zener diode with a minimum rating of 1.3Wat 25ºC (BZX85 or 1N5343) between terminals 3(diode cathode) and 12.(diode anode).

The optional terminal assembly also includesadditional terminals which may be used for linkingcable screens and two terminals connected to thecarbon loaded GRP enclosure. If the enclosure isnot fixed to an earthed structure, one of theseterminals or the earth terminal on the bonding plateshould be connected to the plant's potentialequalising conductor.

Fig 19 Optional back-box terminal assembly

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APPENDIX 1

ATEX Dust Certification

A1.0 ATEX dust certificationIn addition to ATEX certification permittinginstallation in explosive gas atmospheres which isdescribed in the main section of this instructionmanual, all the models also have ATEX dustcertification.

A1.1 Zones, and Maximum SurfaceTemperature

Both indicators have been certifiedEx ia IIIC T80°C Da IP66. When connected to asuitable system they may be installed in:

Zone 20 explosive atmosphere in the formof a cloud of combustible dust inair is continuously present, or forlong periods or frequently.

Zone 21 explosive atmosphere in the formof a cloud of combustible dust inair is likely to occur occasionally innormal operation.

Zone 22 explosive atmosphere in the formof a cloud of combustible dust inair is not likely to occur in normaloperation, but if it does occur, willonly persist for a short period.

Be used with dust in subdivisions:IIIA combustible flyingsIIIB non-conductive dustIIIC conductive dust

Having a Minimum Ignition Temperature of:

Dust cloud 120°C

Dust layer on indicator 155°Cup to 5mm thick

Dust layer on indicator Refer toover 5mm thick. EN 60079-14

At an ambient temperature between -40 and+70°C

A1.2 Installation and maintenanceThe installation requirement described in thismanual for potentially gas explosive atmospheresalso apply when the indicators are installed in adust explosive atmosphere.

The instrument assembly should only be removedfrom the enclosure back-box when dust can notenter the instrument enclosure. Before replacingthe instrument assembly the sealing gasket shouldbe inspected to ensure that it is undamaged andfree from foreign bodies.

It is good practice to prevent dust accumulating onthe indicator enclosure. If this can not be avoided,care should be taken to ensure that the layerthickness does not exceed 5mm for dusts having aminimum ignition temperature of 155°C.

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APPENDIX 2

IECEx certification

A2.0 The IECEx Certification SchemeIECEx is a global certification scheme forexplosion protected products which aims toharmonise international certification standards.For additional information about the IECExcertification scheme and to view the BEKAassociate certificates, please visit www.iecex.com

A2.1 IECEx Certificate of ConformityAll the loop powered indicator models and theoptional accessories have been issued with anIECEx Certificate of Conformity numberIECEx ITS 11.0014X which specifies the followingcertification codes:

Ex ia IIC T5 GaEx ia IIIC T80°C Da IP66Ta = -40°C to 70°C

The specified IECEx gas and dust intrinsic safetyparameters are identical to the ATEX safetyparameters described in the main section andAppendix 1 of this manual.

The IECEx certificate may be downloaded fromwww.beka.co.uk, www.iecex.com or requestedfrom the BEKA sales office.

A2.2 InstallationThe IECEx and ATEX certificates specify identicalsafety parameters and installation requirements forboth approvals as defined by IEC 60079-14. TheATEX installation requirements specified in themain section and Appendix 1 of this manual maytherefore be used for IECEx installations, but thelocal code of practice should also be consulted.

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APPENDIX 3

ETL & cETL certification for installations inUSA and Canada.

A3.0 cETL MarkFor installations in the USA and Canada, all themodels have ETL and cETL intrinsic safety andnonincendive approval, Control Number 4008610.Copies of the Authorisation to Mark may bedownloaded from the BEKA associates websitewww.beka.co.uk or requested from the BEKAassociates sales office

A3.1 Intrinsic safety approvalThe US and Canadian standards used forassessment and certification of the indicators arelisted on the ETL Authorisation to Mark.

Installations must comply with BEKA associatesControl Drawing CI300-83, which is attached tothis appendix.

The ETL safety parameters are the same as theATEX and IECEx parameters, the systems shownin sections 3 and 4 of this manual may thereforealso be used for US and Canadian installationssubject to compliance with the local codes ofpractice and the BEKA Control Drawing.

ETL and cETL intrinsic safety codes

USA & Canada - Division classificationCL I Div 1 Groups A, B, C, D T5 -40ºC ≤ Ta ≤ 70ºCCL II Div 1 Groups E, F, G -40ºC ≤ Ta ≤ 60ºCCL III Div 1 -40ºC ≤ Ta ≤ 60ºC

USA - Zone classificationCL I Zone 0 AEx ia IIC T5 Ga -40ºC ≤ Ta ≤ 70ºCZone 20 AEx ia IIIC T80ºC Da -40ºC ≤ Ta ≤ 60ºC

Canada - Zone classificationEx ia IIC T5 Ga -40ºC ≤ Ta ≤ 70ºCEx ia IIIC T80ºC Da -40ºC ≤ Ta ≤ 60ºC

A3.2 Nonincendive approvalThe indicators also have ETL nonincendiveapproval allowing installation in Class I Division 2hazardous (classified) locations without the needfor Zener barriers or galvanic isolators.

Installations must comply with BEKA associatesControl Drawing CI300-84, which is attached tothis appendix, and with the local codes of practice.

The requirements for nonincendive electricalequipment for use in Class I, Division 2 hazardous(classified) areas is defined by the followingharmonised US / Canadian Standards:

Underwriters Laboratories Inc.UL 121201

Canadian Standards Group.CSA C22.2 No. 213-17

The Standards define the requirements for thedesign, construction and marking of Class IDivision 2 nonincendive equipment and therequirements for the interconnection ofnonincendive equipment and associatednonincendive equipment.

ETL & cETL nonincendive codes US & Canada

CL I Div 2 Groups A, B, C, D T5CL II Div 2 Groups F, G CL III Div 2 -40ºC ≤ Ta ≤ 70ºC

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