307 domnick hunter air compressor

Installation, Operating & Maintenance Instructions

Breathing Air Purification Modules

domnick hunter

dh

1

ARRANGEMENT DRAWINGS

Section Page

1. BAM102 - BAM110 4

2. BA-DME012 to BA-DME030 6

3. BA-DME040 7

4. BA-DME050 to BA-DME060 8

5. BA-DME080 9

MAXI DRYER

Section Page

1. General Description 12

2. Technical Specification 12

3. Operation of DDS Controller 13

4. DDS Heatless Control Schematic (See Figs.) 14

5. Installation 17

6. Maintenance 17

7. Known Misuse 18

8. Fault Finding 18

9. Warranty 19

MIDI DRYER

Section Page

Safety Warning 21



3. Unpacking 23

4. Installation 23

5. Electrical Details 26

6. Operation 27

7. Maintenance 28

8. Fault Diagnosis 29

9. Known Misuse 29

10. Declaration 30

11. Warranty 31

2

PURIFIERS BAH101

Section Page

1. Installation 33

2. Service Life 35

3. Maintenance 35

PURIFIERS BAH102 - BAH106

Section Page

1. Installation 37

2. Service Life 39

3. Maintenance 39

OIL - X FILTERS

Section Page

1. Declaration 41


3. Installation 42

4. Maintenance 43

5. Element Replacement 44

6. Differential Pressure Gauge 46

7. Accessories 47

8. Declaration of Conformity 48

CARBON MONOXIDE MONITOR

Section Page


2. Operation 51

3. Maintenance 53

Internal and external wiring looms V4 55

3

Breathing Air (Maxi) Purification ModulesGeneral Notes

Flow Rate @ 7 barg 160 to 800 scfm

Max.Operating Pressure 13 bargMin.Operating Pressure 4 barg

Max. Inlet Temperature 50ºCMin. Outlet Temperature 5ºC

Power Supply 230V. 110V. or Pneumatic

Breathing Air Maxi Modules 110V

Breathing Air Maxi Modules 240V

Breathing Air Maxi Modules Pneumatic

4

BAM102 - BAM110

5

Breathing Air Midi Purification ModulesType DDS 230V / 1PH / 50-60Hz

Breathing Air Midi Purification ModulesType 230V / 1PH / 50-60Hz

Breathing Air Midi Purification ModulesType 110V / 1PH / 50-60Hz

Technical SpecificationGeneral Notes

Flow Rates @ 7bar g - 24 to 176 cfmMax. Working Pressure BA-DME012-D to BA-DME040-D - 16 bar gMax. Working Pressure BA-DME050-D to BA-DME080-D- 13 bar g

Min. Operating Pressure 4 bar gRecommended Max. Inlet Temperature 30˚C

Absolute Max. Inlet Temperature 50˚CAbsolute Min. Inlet Temperature 5˚C

Dewpoint -40˚C

MODEL COMP.REF. DIM DIM FLOW MAX.INLET WEIGHT INLET OUTLET OUTLET INLETA B @7bar TEMP˚C Kg BSP BSP FILTER FILTER

BA-DME012 606033110 1045 476 24 50 37.6 1/2 3/8 0013G 0013G

BA-DME015 606033120 1211 490 32 50 42.6 1/2 3/4 0040G 0025G

BA-DME020 606033130 1376 490 42 50 47.6 1/2 3/4 0040G 0025G

BA-DME025 606033140 1541 490 53 50 52.6 1/2 3/3 0040G 0025G

BA-DME030 606033150 1707 521 65 50 57.6 1/2 3/4 0040G 0040G

BA-DME040 606033160 1960 732 88 50 73.9 3/4 3/4 2X0040G 0040G

BA-DME050 606033170 1750 1275 106 50 211.0 1 1 BAH101 0080G

BA-DME060 606033180 1916 1275 130 50 223.8 1 1 BAH101 0080G

BA-DME080 606033190 2076 1200 176 50 224 1 1 BA102 0080G


BA-DME012 606033210 1045 476 24 50 37.6 1/2 3/8 0013G 0013G

BA-DME015 606033220 1211 490 32 50 42.6 1/2 3/4 0040G 0025G

BA-DME020 606033230 1376 490 42 50 47.6 1/2 3/4 0040G 0025G

BA-DME025 606033240 1541 490 53 50 52.6 1/2 3/3 0040G 0025G

BA-DME030 606033250 1707 521 65 50 57.6 1/2 3/4 0040G 0040G

BA-DME040 606033260 1960 732 88 50 73.9 3/4 3/4 2X0040G 0040G

BA-DME050 606033270 1750 1275 106 50 211.0 1 1 BAH101 0080G

BA-DME060 606033280 1916 1275 130 50 223.8 1 1 BAH101 0080G

BA-DME080 606033290 2076 1200 176 50 224 1 1 BA102 0080G


BA-DME012 606033310 1045 476 24 50 37.6 1/2 3/8 0013G 0013G

BA-DME015 606033320 1211 490 32 50 42.6 1/2 3/4 0040G 0025G

BA-DME020 606033330 1376 490 42 50 47.6 1/2 3/4 0040G 0025G

BA-DME025 606033340 1541 490 53 50 52.6 1/2 3/3 0040G 0025G

BA-DME030 606033350 1707 521 65 50 57.6 1/2 3/4 0040G 0040G

BA-DME040 606033360 1960 732 88 50 73.9 3/4 3/4 2X0040G 0040G

BA-DME050 606033370 1750 1275 106 50 211.0 1 1 BAH101 0080G

BA-DME060 606033380 1916 1275 130 50 223.8 1 1 BAH101 0080G

BA-DME080 606033390 2076 1200 176 50 224 1 1 BA102 0080G

6

BA-DME012 to BA-DME030

7

BA-DME040

8

BA-DME040 to BA-DME060

9

BA-DME080

DESICCANT AIR DRYERHEATLESS

Dewpoint Dependant Switching

domnick hunter

dh

Installation Operating & Maintenance Instructions

Do not operate the dryer until the instructions in the operation section of this manual have been readand understood by all personnel concerned.

It is essential that personnel employ safe working practices and observe all related regulations and legalrequirements for safety when operating the dryer.

When handling, operating or carrying out maintenance on the dryer, personnel must employ safe engineeringpractices and observe all relevant local health and safety requirements and regulations. The attention of UKusers is drawn to the Health and Safety at Work Act 1974, and the Institute of Electrical Engineers Regulations.

Most accidents which occur during the operation and maintenance of machinery are the result of failure toobserve basic safety rules or precautions. An accident can often be avoided by recognising a situation that ispotentially hazardous.

Improper operation or maintenance of the dryer could be dangerous and result in an accident causing injury oreven death.

domnick hunter can not anticipate every possible circumstance which may represent a potential hazard. TheWARNINGS in this manual cover the most common potential hazards and are therefore not all-inclusive. If theuser employs an operating procedure, an item of equipment or a method of working which is not specificallyrecommended by domnick hunter he must ensure that the dryer will not be damaged or made unsafe and thatthere is no risk to persons or property.

IMPORTANTSafety Signs

Operations or procedures involving specific hazards which could cause injury or death if precautions are notheeded, are identified by the following symbols which are displayed on the desiccant air dryer to indicatepotential danger points.

IT IS STRONGLY RECOMMENDED THAT THE INSTALLATION AND OPERATING INSTRUCTIONS AREREAD THOROUGHLY BEFORE PROCEEDING ANY FURTHER.

PLEASE NOTE: YOUR WARRANTY MAY BE INVALIDATED IF THE EQUIPMENT HAS NOT BEENINSTALLED, COMMISSIONED OR MAINTAINED BY domnick hunter OR ITS APPROVED AGENTS.

WARNING: RISK OF DANGER

CAUTION: RISK OF HIGH PRESSURE

CAUTION: RISK OF ELECTRIC SHOCK

SAFETY WARNING!

11

12

MODEL

Code Suffix

Pressure Dewpoint

Controls

Electrical Supply

Dewpoint Display

Analogue Output

Alarm Output

Indicators

WITH DEWPOINT DISPLAY

DS

-40˚C

Cam Timer fitted with fullHygrometer

240V 1ph 50Hz110V 1ph 60Hz

Digital LCD

4 to 20 mA linear(Max Load 800Ω)

0 to 1V linear

Volt free contact;rated 2A 240 Vac or 30 Vdc

Power On

Dewpoint Switching Active

Dewpoint Alarm

WITHOUT DEWPOINT DISPLAY

DS-ND

-40˚C

Cam Timer fitted with PCB

240V 1ph 50Hz110V 1ph 60Hz

None

1 to 6V non-linear

Volt free contact;rated 2A 240 Vac or 30 Vdc

Power On

Dewpoint Switching Active

Dewpoint Alarm

The adsorptive capacity of the desiccant within the dryer is essentially constant whereas the moisture loadingand the air flow through the dryer are continuously varying. In order to maintain the specified air qualitydownstream of the dryer, it has to be sized for the worst case conditions, namely lowest pressure, highest flowand highest inlet temperature. These conditions may only occur for a small part of the service life of the dryer,for example, the highest inlet temperatures may only be present during the summer months. This means thatthe moisture loading on the desiccant beds is below the dryer’s capacity for much of its service life e.g. quietperiods in between shifts usually have lower air supply requirements.

To gain access to this adsorptive capacity, a moisture sensor is fitted which monitors the downstream dewpoint,this system is known as Dewpoint Dependent Switching (DDS). This interrupts the normal sequence of thecontroller which then instructs the dryer to change over only when the desiccant has adsorbed moisture to itscapacity. This effectively elongates the drying cycle. However, as regeneration has been optimised for a fullyladen desiccant bed, this remains of constant duration resulting in a period of zero energy consumption; purgingis discontinued. In this way energy savings are obtained when compared to the operation of a fixed cycle,without sacrificing the resulting air quality.

Dewpoint Dependent Switching (DDS) is available in two variants, with or without dewpoint monitoring display.

This manual describes the operation of and equipment used in the DDS system only, and should be used inconjunction with the standard PNEUDRI I.O.M.I.

1. GENERAL DESCRIPTION

2. TECHNICAL SPECIFICATION

13

1. INTRODUCTION

The Dewpoint Switching Systems with and without dewpoint display options incorporate two relaysdesignated Alarm 1 and Alarm 2. These relays are preset by domnick hunter and are configured such thatAlarm 1 controls the dewpoint switching function and Alarm 2 operates the fault and remote alarmfunctions. Alarm 1 is configured HI normally closed, and Alarm 2 is configured HI normally closed. The HIfunction causes an alarm signal to be generated when a high moisture content (i.e. wet dewpoint) isencountered.

2. OPERATION OF DEWPOINT DEPENDENT SWITCHING

References should be made to Figure 1 (PCB option without dewpoint display) and Figure 2 (HygrometerDisplay).

Alarm 1 on both options controls the activation of the Dewpoint Dependent Switching. When the dryeroutlet dewpoint is wetter than the set point for Alarm 1, an alarm signal is generated. Consequently thenormally closed contact of the Alarm 1 relay opens and the cam timer relay coil is de-energised, thenormally closed contact of the cam timer relay remains closed and the cam timer operates.

Conversely, when the outlet dewpoint of the dryer becomes drier than the set point for Alarm 1, an alarmsignal is not generated, and the normally closed Alarm 1 relay contact closes. The cam timer coil becomesenergised causing the normally closed contact of the cam timer relay to open, thereby stopping the camtimer and producing a period of zero energy consumption. This will only occur when the offline bed hasbeen fully regenerated and repressurised.

3. OPERATION OF ALARM (FAULT) FUNCTION

Alarm 2 on both options controls the activation of the fault alarm function. When the dryer outlet dewpointis wetter than the set point for Alarm 2 an alarm signal is generated which opens the normally closedcontact of the Alarm 2 relay. This causes the fault alarm relay coil to become de-energised, the normallyclosed contact of the fault alarm relay closes and the alarm lamp illuminates.

Conversely, when the outlet dewpoint of the dryer becomes drier than the set point for Alarm 2 an alarmsignal is not generated. Consequently the normally closed contact of the Alarm 2 relay remains closed andthe fault alarm relay coil becomes energised. The normally closed contact of the fault alarm relay opens,and the alarm lamp does not become illuminated.

4. FAILURE MODES

Should a fault develop on the system the normally closed contacts on the cam timer relay and fault alarmrelay close, thereby allowing continued operation of the cam timer and illuminating the alarm lamp. Inaddition a pair of volt free contacts are provided which open on alarm, these may be used to provideremote indication that a fault has occurred. In the event of a power failure (i.e. transformer fault or blownfuse) the normally closed contacts of the fault alarm relay will close thereby activating a remote alarm. Theremote alarm contacts are rated at 240Vac and any external equipment or remote indicators should notexceed this level.

5. INDICATION OF DRYER DEWPOINT

A voltage output (1-6V) corresponding to the dewpoint being monitored by the hygrometer sensor may betaken from the PCB on the non-display option and this may be used to indicate the dryer dewpoint.However this output is non-linear and direct conversion to a dewpoint value requires the linearisation datafor the sensor version used (available on request). If the full display hygrometer is fitted, a linear 4 to 20mA (max load 800Ω) and linear 0 to 1V analogue outputs are available.

3. OPERATION OF DDS CONTROLLER

14

4. DDS HEATLESS CONTROL SCHEMATIC

FIG. 1 PCB Option Without Dewpoint Display

15

FIG. 2 Hygrometer Display

16

FIG. 3 Pneumatic Schematic

17

Rear View of Control Box

1) Hygrometer Power Connection 2) Power Connection 3) Remote Alarm (where fitted)(Display Variant)

Hygrometer Sensor(PCB Variant)

4) Indicator Lights 5) Solenoid Side A 6) Solenoid Side B

7) Hygrometer Alarm Cable A) Constant Pressure B) Column Pressure Side A(with display option only)

C) Column Pressure Side B

5.1 REMOTE OUTPUTSTwo remote outputs are available. The first is a remote alarm which provides fault indication via the voltfree contacts (and the normally open contact on the fault alarm relay). The second is an analoguevoltage output which may be taken from the hygrometer display or PCB board on the non-display optionto remotely indicate the dryer dewpoint.

5. INSTALLATION

6. MAINTENANCE

The controller is designed to be maintenance free, however, if required, periodic replacement of theAA0003G filter element upstream of the sensor may be undertaken, in addition to annual recalibration of thehygrometer sensor.

If any other maintenance or repair work is deemed to be required, please contact domnick hunter , or adomnick hunter approved distributor.

4

56 7 B C

A

321

18

(Please ensure that the following situations do not occur in your installation)

* Tampering with the controller.

* Disconnection of hygrometer sensor.

* Kinking of pneumatic tubing

* Tampering with hygrometer settings.

* Operation of dryer whilst the ON/OFF switch is in the OFF position.

* Power not connected to the controller

VISUAL INDICATIONCam timer not running

Warning lamp illuminated

Power on lamp not illuminating

Dewpoint Switching inoperative

Energy saving lamp notilluminating

Dryer always in DewpointSwitching mode

Hygrometer displaypermanently indicates -80

Dryer never in DewpointDependent Switching mode

PROBABLE CAUSEPower failure

Dryer in DDS mode

Controller faultCam timer faultHygrometer sensor faultDewpoint wetter than set point forAlarm 2Controller faultHygrometer settings incorrectBlown bulbNo incoming power

Dewpoint wetter than set point forAlarm 1

Controller faultLoss of pneumatic signals tocontrollerBulb blownDryer not in Dewpoint Switchingmode

Dewpoint Switching InoperativeDewpoint dryer than DDSsetpoint

Sensor fault (open circuit)Controller faultDewpoint dryer than -80˚CSensor fault (open circuit)Controller faultDewpoint wetter than set point forAlarm 1Alarm fault active

Controller faultLoss of pneumatic signal tocontroller

CHECKIs power lamp on?Incoming supply present?Fuses intact?Is dewpoint dryer than set pointfor Alarm 1? Use serviceengineers sensor simulator tosimulate wet dewpoint

Use service engineers sensorsimulator to simulate dry dewpoint

Bulb intact?Incoming supply present?Fuses intact?

Simulate dry dewpoint usingservice engineers sensorsimulator

Kinking of pneumatic tubing, airleakageBulb intact?Is dewpoint wetter than set pointfor Alarm 1 (use serviceengineers sensor simulator)As aboveSimulate wet dewpoint usingservice engineers sensorsimulator

Simulate wet dewpoint usingservice engineers sensorsimulatorUse service engineers sensorsimulator to simulate dry dewpointIs Dewpoint wetter than set pointfor Alarm 2

Kinking or leaks from pneumatictubing

REMEDYCheck for incoming supply,replace fuses if blown

If Dewpoint drier than set pointthen DDS is functioning correctly.If not call service engineer

Call service engineerCall service engineerCall service engineerCall service engineer

Call service engineerCall service engineerReplace if necessaryReplace fuses if blownIf fault persists call serviceengineerCall service engineer

Call service engineerRectify kinking of tube if possible,otherwise call service engineerReplace if necessaryCall service engineer

Call service engineerCall service engineer

Call service engineerCall service engineerCall service engineerCall service engineerCall service engineerCall service engineer

If not, call service engineer

Call service engineerRectify kinking or leaks from tubeif possible, otherwise call serviceengineer

7. KNOWN MISUSE

8. FAULT FINDING

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9. WARRANTYThis warranty applies to dryers and associated pre-filters (the Equipment) manufactured andsupplied by domnick hunter.

Use of the dryer without the recommended genuine domnick hunter manufactured filtrationor genuine parts, will expressly invalidate the warranty.

Should the Equipment by defective as to materials or workmanship, domnick hunter warrants thatit will remedy such defect for a period of 12 months from the date of despatch. Where theEquipment is a desiccant dryer, the warranty period will be 12 months from the date ofcommissioning or 18 months from date of despatch, whichever is the earlier, provided suchcommissioning is carried out by domnick hunter or it’s authorised agent. In the case of Equipmentother than a desiccant dryer, the warranty period shall commence from the date of despatch.Should any defect occur during the warranty period and be notified in writing to domnick hunter orit’s authorised agent within the said period, domnick hunter will, at it’s sole option, remedy suchdefects by repair or by provision of a replacement part, provided that the Equipment has been usedstrictly in accordance with the instructions provided with each item of the Equipment and has beenstored, installed, commissioned, operated and maintained in accordance with such instruction andgood practice. domnick hunter shall not be under any liability whatsoever under the warranty if,before giving notification in writing to domnick hunter as aforesaid, the Customer or any third partymeddles, interferes, tampers with or carries out any work whatsoever (apart from normalmaintenance as specified in the said instructions) in relation to the Equipment or any part thereof.

Any accessories, parts and equipment supplied by domnick hunter but not manufactured bydomnick hunter, shall carry whatever warranty the manufacturer has given domnick hunterprovided it is possible for domnick hunter to pass on such warranty to the Customer.

To claim under the warranty, the goods must have been installed and continuously maintained inthe manner specified in the Installation, Operating and Maintenance Instruction (I.O.M.I.). OurProduct Support Engineers are qualified and equipped to assist you in this respect. They are alsoavailable to make repairs that may become necessary in which event they will require an officialorder before carrying out the work. If such work is to be the subject of warranty claim, the ordershould be endorsed ‘for consideration under warranty’.

Any substitution of parts not manufactured or approved by domnick hunter will expresslyinvalidate the warranty.

domnick hunterdh

HIGH EFFICIENCYCOMPRESSED AIR DRYERS

USER GUIDE

MIDI PLUS

Do not operate the dryer until the instructions in this manual have been read and understood by allpersonnel concerned.

When handling, installing or operating, personnel must employ safe engineering practices and observe allrelated regulations, health and safety procedures, and legal requirements for safety.

Most accidents that occur during the operation and maintenance of machinery are the result of failure toobserve basic safety rules and procedures. Accidents can be avoided by recognising that any machinery ispotentially hazardous.

domnick hunter can not anticipate every possible circumstance which may represent a potential hazard.The WARNINGS in this manual cover the most known potential hazards, but by definition cannot be allinclusive. If the dryer user employs an operating procedure, item of equipment or a method of working whichis not specifically recommended by domnick hunter the user must ensure that the dryer will not be damagedor made a potential hazard to persons or property.

IMPORTANT DME Facia

Caution: PowerRisk of Electric Shock

Attention

PLEASE NOTE THAT YOUR WARRANTY MAY BE INVALIDATED IF THE EQUIPMENT HAS NOT BEENINSTALLED, COMMISSIONED OR MAINTAINED BY domnick hunter OR A domnick hunter APPROVEDAGENT.

The MIDI PLUS range of compressed air dryers are designed to remove moisture from compressed air by

utilising state of the art technology to obtain dewpoints of -40oC, and by appropriate de-rating,

-70oC.

The MIDI PLUS range of dryers have been designed to require minimal maintenance and can be installed

virtually anywhere.

The MIDI PLUS dryer consists of an inlet and an outlet manifold joined together with an aluminium column.

The column has twin internal chambers both filled with desiccant material. During operation one chamber ison-line (drying) while the other is regenerating, using the Pressure Swing Adsorption (PSA) process.

Pressure Swing Adsorption (PSA)A small percentage of dried air is taken from the dryer output flow and is used to regenerate the saturatedchamber by expanding the dried air from line pressure to atmospheric pressure. During this process, themoisture is physically removed from the regenerating chamber and vented to atmosphere through theexhaust silencers.

Dewpoint Dependent Switching (DDS) - OptionalIf DDS is fitted, this will adjust the dryers cycle in line with the moisture loading placed upon it, by constantlymonitoring the processed air moisture content. Also available as a retrofit to all DME dryer models.

21

SAFETY WARNING!


Power on LED

ECO (DDS) LED

22

KEY1 By-pass Valve2 Inlet Valve3 Inlet Filter4 By-pass Line5 Outlet Valve6 Outlet Filter7 Outlet Sight Glass8 Pressure Gauges9 Control Box

10 Feed Line(Optional with Dewpoint Dependent Switching)

IN

1

2

3

4

5

6

7

108

9

OUT

2. TECHNICAL SPECIFICATION

Type HeatlessModel DME

Operating flow range 14 cfm - 299 cfm ( 0.4m3/min - 8.47 m3/min )

Dewpoint: Nominal -40oC (-40oF)

Optional -70oC (-94oF)Air quality : inc filtration (dirt. water. oil) SO 8573.1 Class 1.2.1. Class 1.1.1 OptionalMaximum operating pressure DME012 to DME040 16 Bar(g) (232 psig)

DME050 to DME080 13 Bar(g) (188 psig) Minimum operating pressure 4 Bar(g) (58 psig)

Maximum inlet temperature 50oC (122oF)

Minimum inlet temperature 5oC ( 41oF)Regeneration Pressure Swing Adsorption (PSA)Nominal pressure drop across desiccant bed 140 mBar (g) (2 psi g)Standard electrical supply ( ± 10% ) 230 VAC . 1phase. 50/60 Hz(Others on request) 110 VAC . 1phase. 50/60 HzControls Electronic Control TimerNoise level <75 dB (A) Media DesiccantMaterial Column High tensile extruded aluminium.

Inlet/Outlet head Pressure die cast high tensile aluminium.Finish Alocrom anti-corrosion protection and dry powder

epoxy painted.Construction Column snow storm filled with desiccant material

and contained between the inlet and outlet head using high tensile bolts.

23

Every care is taken during product packaging by domnick hunter . It is advisable after carefully unpackingthe dryer to carry out a thorough visual inspection of the unit for any signs of transit damage incurred afterleaving our factory.

If any damage is found please report this immediately to the carrier and the distributor involved (if applicable),or directly to domnick hunter ltd.

1. GeneralCare must be taken to ensure that the dryer is not subject to flows (even peaks) in excess of the dryers ratedcapacity.

The dryer must be vertical, and level, with the inlet at the bottom.

Position the dryer to allow safe maintenance and operation.

The dryer can be free standing or secured to the floor via the fastener points provided in the base.

The purge air flow is factory set for 6 Bar g (87 psi g) minimum system pressure. Should your minimumpressure be lower, the purge air flow must be reset by trained domnick hunter personnel to maintainspecified dewpoint.

Suitably rated pipework and connections must be used during installation. All pipework must be secure andsafely positioned.

If required the exhaust assembly can be piped away, remote from the dryer.

DME012 to DME040 rangeTwo inlet port connections are available. Only remove the fitted sight glass from the port chosen as the inletto the dryer.

Two outlet port connections are available. Only remove the fitted sight glass from the port chosen as theoutlet side from the dryer.Note: The remaining sight glass will adsorb moisture from the atmosphere and require replacing if the outlethead is not piped up immediately.

DME050 to DME080 rangeOne port is available for the inlet to the dryer.

One port is available for the outlet from the dryer only. Remove the fitted plug.Note: The sight glass will adsorb moisture from the atmosphere and require replacing if the outlet head is notpiped up immediately.

Dewpoint Dependent Switching (DDS) - OptionalThe DDS system requires a sampling point to be inserted in the pipework at the outlet of the dryer,downstream of the after-filter but before the isolation valve. P.T.F.E. tubing must be used to link the samplingpoint to the 4mm push-in connector of the DDS system on the dryer.

2. Filtrationdomnick hunter inlet and outlet filtration must be fitted to the dryer, e.g. WS (optional) , AO(recommended), an AA grade pre-filter and an AR grade after-filter are essential. All filtration must beinstalled using the practices described in the User Guide supplied with the filters.

3. UNPACKING

4. INSTALLATION (Refer to figure 1)

26

3. By-pass lineIt is recommended that a by-pass line is installed to ensure a constant air supply, and safety, duringmaintenance. This allows untreated air to by-pass the dryer, at the customers discretion during dryermaintenance. The by-pass valve should only be open when the dryer is undergoing maintenance followingthe shut down procedure.

4. ValvesIsolation valves are recommended on the inlet, outlet and by-pass lines.

This only applies to electrically powered units.

Competent qualified electricians must work on dryer supply circuitry.

Check the rating plate for power supply requirements.

Correct isolator switches must be provided at a safe and accessible point near to the dryer.

The dryer must be connected with a live, neutral and earth. The live pin on the dryer has a fuse fitted.

Connect power to the dryer via an IEC320 socket cord set, and retain with clip.

5.ELECTRICAL DETAILS

L

N

AC MODELS

FUSE BAY

27

Start up procedureEnsure the dryer inlet and outlet isolation valves are fully closed and that all covers on the dryer are secure.

Ensure that a suitable supply of compressed air to within the dryers technical specifications is available.Turn ON external electrical isolator, the yellow power on LED should illuminate and the dryer shouldcommence cycling.NB - all valves must be opened and closed graduallyProceed as follows

Using by-pass lineWith the by-pass valve fully open, introduce air into the dryer by opening the inlet valve until fully open.Allow the dryer to fully pressurise to full system pressure, then open the outlet valve while simultaneouslyclosing the by-pass valve.The dryer is now on stream.

Without by-pass lineIntroduce air into the dryer by opening the inlet valve until fully open.Allow dryer to fully pressurise to full system pressure, then open the outlet valve.The dryer is now on stream.

During operationDuring normal operating conditions the dryer is fully automatic and requires no further attention until shut-down. The yellow power on LED should be “ON” continuously.

The dryer column contains two chambers of desiccant material. Whilst one chamber is drying thecompressed air (adsorption) the other chamber is simultaneously undergoing regeneration (desorption).Every two minutes the chambers are reversed in function, this is the changeover point.Changeover is characterised by a immediate venting of compressed air from the chamber enteringregeneration.The adsorption chamber is indicated by the relevant pressure gauge on the dryer reading full system airpressure.The desorption chamber is indicated by the relevant pressure gauge on the dryer reading virtually zero.After 1 1/2 minutes the desorption chamber repressurises to equal the adsorption chamber pressure, readyfor changeover of the chambers.

The pressure gauges and sight glass moisture indicator are for indication purposes only.

Dewpoint Dependent Switching (DDS) - optionalThe DDS system operates as described above, with the following modifications.If the dryer is producing air at a better dewpoint than specified the DDS system will hold the dryer at a pointjust before the changeover occurs. The green “ECO” LED will illuminate. Both pressure gauges will read fullsystem pressure.The dryer will resume normal operation the instant the DDS system monitors a fall in dewpoint to thespecified level.

The crystals in the outlet sight glass moisture indicator should be blue for correct operation, however, if thesechange colour to pink the dryer is producing a wetter dewpoint than required, and the cause of this must beinvestigated (refer to fault diagnosis table).

Shut-down procedureThe dryer can be shut down at any point in its cycle.

6. OPERATING THE DME DESICCANT AIR DRYER

28

Using by-pass lineClose the dryer outlet valve whilst simultaneously opening the by-pass valve.Close the dryer inlet valve.The air will now by-pass the dryer, allow the dryer to depressurise before isolating electrical supply, ventpressure from inlet and outlet filters using methods described in the filter User Guide. The dryer may still bepressurised if this is not done.

Without by-pass lineClose the dryer outlet valve.Close the dryer inlet valveAllow the dryer to depressurise before isolating electrical supply, vent pressure from inlet and outlet filtersusing methods described in the filter User Guide. The dryer may still be pressurised if this is not done.

DailyEnsure yellow “POWER ON” LED is not flashing.Visually check crystals in sight glass moisture indicator for blue colour.

WeeklyCheck dryer seals, fittings and pipe work for air leaksCheck inlet and outlet filtration for indication of element blockage (see User Guide for Filters)Ensure correct operation of filtration condensate drainage (if applicable).

The desiccant material in the dryer has a finite life dependent upon operating conditions but it will typicallyexceed 10,000 hours use before it needs replacing. It will also require replacing if contaminated. Care mustbe taken prior to any routine pipe flushing operations.

The outlet sight glass moisture indicator requires replacing once the crystals are no longer blue. A servicekit is available.

Desiccant changes, service kits and service training courses are available for the MIDI PLUS range of dryers

on request. Service kits must only be used by domnick hunter trained personnel.

Only domnick hunter trained personnel can remove the covers on the dryer.

7. MAINTENANCE RECOMMENDATIONS

29

8. FAULT DIAGNOSIS TABLE

Problem Indication Probable cause Remedy

Poor Dewpoint Crystals go pink in outlet Entrained water Check pre-filtration and pre-filtration drainsmoisture indicator

Excessive air flow demand Check actual flow against rated flow of dryerCheck for recent additions to air system

Inlet pressure too low Check against technical specification

Excessive inlet air temperature Check against technical specification

Insufficient purge air flow Factory set for 6 bar g (87 psig) system pressure.

domnick hunter trained personnel to adjust

Exhaust silencers blocked Change by domnick hunter trained personnel

Contaminated desiccant Eliminate source of contamination. Desiccantchange by domnick hunter trained personnel

Electrical fault Flashing Yellow LED Hardware fault Contact domnick hunter customer services

High differential pressure Pressure gauges Excessive outlet flow Check and regulate air demand

Failure to purge No depressurisation Purge valve blocked or shut. domnick hunter trained personnel to adjust and poor dewpoint Exhaust silencers blocked Change by domnick hunter trained personnel

Outlet air flow stops Downstream pressure drops Electrical fault Contact domnick hunter customerservices

Yellow LED “OFF” Blown fuse in plug Change by competent personnel

Constant depresurisation Erratic air flow from exhaust Damaged valve Change by domnick hunter trained personnel

9. KNOWN MISUSE

FiltersLack of filtration.Installation of inlet filters remote from the dryer inlet head, allowing possible condensation to occur betweenfilters and dryer.Blow down valve upstream of filters causing back flow / possible collapse of filter element.Installing filters in wrong flow direction.Opening inlet valve too quickly, causing initial high differential pressure across filter element.Differential pressure gauge/indicator fitted wrong way around giving false differential pressure reading.Combining drain pipes from filters to a single drain valve.

Inlet / outlet headPipe diameter too small.Pipework unsupported.Inlet pipework taken from low point of manifold range, allowing bulk water intrusion into the dryer.

Control box/electric’sIncorrect wiring configuration by user, or incorrect supply voltage.No neutral or earth wire fitted by user to dryer.

Additional ItemsUse of non recommended componentry.Untrained / unauthorised maintenance or installation personnel used.Subsequent increase in air consumption without relation to dryer flow capacity.Purging of pneumatic system and dryer with cleaning agents that have the potential to damage desiccantmaterial.Covers removed or loose during operation.

30

DECLARATION OF CONFORMITY

98/37/EC

Name of manufacturer or supplier:

domnick hunter limited

Full postal address including country of origin

Dukesway, Team Valley Trading Estate,

Gateshead, Tyne & Wear, England, NE11 0PZ

Description of product Adsorption Dryer

Name type or model, batch or serial numberDME012, DME015, DME020, DME025, DME030,

DME040, DME050, DME060, DME080.

Standards used, including number, title,

issue date and other relative documents

EN292-1 : 1991, EN292-2 : 1991, EN50081-2:1994, EN50081-1:1992EN50082-1:1998, EN50082-2:1995, EN61010-1:1993

Place of issue: GATESHEAD, TYNE & WEAR, ENGLAND

Name of authorised representative

ERIC W. BLAKIE

Position of authorised representative

MANAGING DIRECTOR (INDUSTRIAL DIV.)

Full postal address if different from manufacturers

Declaration

I declare that as the authorised representative, the above information in

relation to the supply/manufacture of this product, is in conformity with the

stated standards and other related documents following the provisions of

the 98/37/EC Directive.

Signature of authorised representative:

GB

Declaration of Conformity

31

This warranty applies to dryers and associated pre-filters (the Equipment) manufactured andsupplied by domnick hunter.

Use of the dryer without the recommended genuine domnick hunter manufactured filtration orgenuine parts, will expressly invalidate the warranty.

Should the Equipment by defective as to materials or workmanship, domnick hunter warrants that itwill remedy such defect for a period of 12 months from the date of despatch. Where the Equipment isa desiccant dryer, the warranty period will be 12 months from the date of commissioning or 18 monthsfrom date of despatch, whichever is the earlier, provided such commissioning is carried out bydomnick hunter or it’s authorised agent. In the case of Equipment other than a desiccant dryer, thewarranty period shall commence from the date of despatch. Should any defect occur during thewarranty period and be notified in writing to domnick hunter or it’s authorised agent within the saidperiod, domnick hunter will, at it’s sole option, remedy such defects by repair or by provision of areplacement part, provided that the Equipment has been used strictly in accordance with theinstructions provided with each item of the Equipment and has been stored, installed, commissioned,operated and maintained in accordance with such instruction and good practice. domnick hunter shallnot be under any liability whatsoever under the warranty if, before giving notification in writing todomnick hunter as aforesaid, the Customer or any third party meddles, interferes, tampers with orcarries out any work whatsoever (apart from normal maintenance as specified in the said instructions)in relation to the Equipment or any part thereof.

Any accessories, parts and equipment supplied by domnick hunter but not manufactured by domnickhunter, shall carry whatever warranty the manufacturer has given domnick hunter provided it ispossible for domnick hunter to pass on such warranty to the Customer.

To claim under the warranty, the goods must have been installed and continuously maintained in themanner specified in the User Guide. Our Product Support Engineers are qualified and equipped toassist you in this respect. They are also available to make repairs that may become necessary in whichevent they will require an official order before carrying out the work. If such work is to be the subject ofwarranty claim, the order should be endorsed ‘for consideration under warranty’.

Any substitution of parts not manufactured or approved by domnick hunter will expresslyinvalidate the warranty.

11. WARRANTY

CATALYST/ACTIVATED CARBON PURIFIER MODEL BAH101

dh

USER GUIDE

domnick hunter

33

Figure 2

1. The purifier should besecurely mounted on asuitable structure, which isfree from vibration. It shouldbe secured using the two Ø12holes through the centre ofthe column.

2. Filtration

a. Pre-filtration

This must be positioned asclose to the inlet as possible.domnick hunter grade AO andAA filters must be fittedupstream of the inlet to preventcontamination of the activatedcarbon ‘bed’.

In case of extreme watercontamination, a domnickhunter Water separator shouldalso be incorporated into thesystem prior (upstream) to theAO filter.

b. After-filtration

A domnick hunter grade AR filtermust be fitted downstream ofthe purifier to prevent activatedcarbon dust carryover.

1. INSTALLATION Figure 1

OUTLET HEAD

GASKET PLATE

HEAD BOLTS

INLET HEAD

3/4” BSPPFEMALE THREADEDCONNECTIONS

34

* Grade AO - General purpose filter : particle removal down to 1 micron, maximum remainingoil content 0.5 mg/m3 at 210C.

Grade AA - High efficiency filter: particle removal down to 0.01 micron, maximum remainingoil content 0.01 mg/m3 at 210C.

Note - Fixing kits are available for bolting AO and AA filters together dispensing withunnecessary inter-connecting pipework for 0058G/G and 0145G/G order Fixing Kit FXK3.

** Grade AR - Dust filter: 100% particle removal down to 1 micron, 98% removal at 0.3 micron.

C.Filter Sizing

It is recommended that each purifier bank has its own filtration. Filter sizes for eachpurifier are shown in Table 1.

5. Shut-off valves (Figure 2) should be fitted to the inlet and outlet pipework of each purifier toallow isolation for maintenance.

6. By-pass lines should be avoided whenever possible as contamination may leak throughvalves and by-pass filters.

7. In line valves should be opened slowly to avoid high surge flows.

8. The inlet valve should be carefully opened to pressurise the purifier, then slowly opening theoutlet valve will bring the purifier on-line.

Table 1

MODEL Nominal Flow Rate Dim A Pipe Recommended Filtration Filter/Dryer

NL/s@ 7 scfm @ (see fig.2) conns. Inlet * Outlet ** Dryer Pipe sizebar g 100 psi g mm

BAH 101 61 130 535 3/4” AO-0080G/G AR-0080G/G BADME050 1”AA-0080G/G BADME060

35

MODEL Replacement dh Comp. Gasket dh Comp. Additional Service ToolDesiccant Pack No. Seal Kit No.

BAH 101 RP 101 605009772 COL. GKT. 608202114 Snow Storm Filler

The service life of the purifier is determined by the temperature of the air flowing through it.With mineral type compressor oils the expected service life of the purifier at a line pressure of7 bar g is:6000 hours at an air temperature of 300C, and 2000 hours at an air temperature of 450C.

2. SERVICE LIFE

1. Replacing Activated Carbon/Catalyst

To replace the activated carbon/catalyst the top head should first be removed by unboltingthe head bolts (see Figure 1). The top gasket then removed. The activated carbon/catalystmay now be extracted using an industrial vacuum cleaner (the use of a suitable face maskis recommended during this operation).

Replacement activated carbon/catalyst packs are available from domnick hunter (seetable 2). The use of a snow storm filling device (see table 2) is essential to achievemaximum packing of new carbon/catalyst. New gasket seals should be fitted. The top headreplaced and head bolts tightened in sequential manner to a torque of 25 lb.ft (34Nm).

Note - Do not attempt to remove heads or replace activated carbon/catalyst whilst ACpurifier is pressurised. Always check that purifier is not pressurised.

3. MAINTENANCE

Table 2

Note - If replacing both top and bottom heads please order 2-off of the Gasket Seal Kits.

2. Maintenance Plans

domnick hunter offers service plans which are tailored to each customer’s requirements.Through these plans, the service/maintenance responsibility becomes domnick hunter’s .For details please contact our Service Department.

CATALYST/ACTIVATED CARBON PURIFIER MODELS BAH102 - BAH106

User Guide

domnick hunter

dh

37

Figure 1

Figure 2

EYE BOLTS

HEAD BOLTSOUTLET FLANGE

COLUMNS

OUTLETMANIFOLD

MOUNTINGFEET

MANUAL DRAINVALVE

FEMALETHREADED/FLANGEDCONNECTIONS

1. Provision is made for liftingthe purifier as a completeunit by two eye bolts locatedin the top of the unit (seeFigure 1). Ensure that theeye bolts are screwed fullyhome before attempting alift (each bank of a multi-bank system should be liftedseparately.)

2. The purifier should besecurely mounted on asuitably structured, flat andlevel floor or base which isfree from vibration. It maybe secured to the base usingbolts located through theslots in the mounting feet.

3. A clearance of approximately 2 metres around the purifierand 300mm between banksallow comfortable access formaintenance.

4. Filtration

a. Pre-filtration

This must be positioned asclose to the inlet as possible.domnick hunter grade AOand AA filters must be fittedupstream of the inlet toprevent contamination of theactivated carbon ‘bed’.

In case of extreme watercontamination, a domnickhunter Water separatorshould also be incorporatedinto the system prior(upstream) to the AO filter.

b. After-filtration

A domnick hunter grade ARfilter must be fitteddownstream of the purifier toprevent activated carbon dustcarryover.

1. INSTALLATION

38

C. Filter Sizing

It is recommended that each purifier bank has its own filtration. Filter sizes for eachpurifier are shown in Table 1.

5. Shut-off valves (Figure 2) should be fitted to the inlet and outlet pipework of each purifierto allow isolation for maintenance.

6. By-pass lines should be avoided whenever possible as contamination may leak throughvalves and by-pass filters.

7. In line valves should be opened slowly to avoid high surge flows.

8. The inlet valve should be carefully opened to pressurise the purifier, then slowly openingthe outlet valve will bring the purifier on-line.

Table 1

MODEL Nominal Flow Rate Dim A Pipe Weight Recommended Filtration Filter/Dryer

NL/s@ 7 scfm @ (see fig.2) conns. kg Inlet * Outlet ** Dryer Pipe size

bar g 100 psi g mm

BAH 102 132 280 521 2” 66 AO-0220G/G AR-0220G/G DX104BA 2”

AA-0220G/G

BAH 103 198 420 628 2” 90 AO-0220G/G AR-0220G/G DX105 BA 2”

AA-0220G/G

BAH 104 264 560 734 2” 114 AO-0405G/G AR-0405G/G DX107 BA 2.5”

AA-0405G/G


AA-0405G/G


AA-0405G/G

* Grade AO - General purpose filter : particle removal down to 1 micron, maximumremaining oil content 0.5 mg/m3 at 210C.

Grade AA - High efficiency filter: particle removal down to 0.01 micron, maximumremaining oil content 0.01 mg/m3 at 210C.

Note - Fixing kits are available for bolting AO and AA filters together dispensing withunnecessary inter-connecting pipework for 0220G/G and 0405G/G order Fixing Kit FXK4.

** Grade AR - Dust filter: 100% particle removal down to 1 micron, 98% removal at 0.3micron.

39

MODEL Replacement dh Comp. Gasket dh Comp. Additional Service ToolDesiccant Pack No. Seal Kit No.

BAH 102 RP 102 605009240 GK 102 605009190 Snow Storm Filler 608200622BAH 103 RP 103 605009250 GK 103 605009200 Snow Storm Filler 608200622BAH 104 RP 104 605009260 GK 104 605009210 Snow Storm Filler 608200622BAH 105 RP 105 605009270 GK 105 605009220 Snow Storm Filler 608200622BAH 106 RP 106 605009280 GK 106 605009230 Snow Storm Filler 608200622

The service life of the purifier is determined by the temperature of the air flowing through it. With mineraltype compressor oils the expected service life of the purifier at a line pressure of 7 bar g is:6000 hours at an air temperature of 300C, and 2000 hours at an air temperature of 450C.

2. SERVICE LIFE

1. Routine Maintenance

Any build-up of carbon dust in the outlet manifold may be cleared by opening the manual drain valve(in an anticlockwise direction) located on the underside of the outlet manifold.

2. Replacing Activated Carbon/Catalyst

To replace the activated carbon/catalyst the top manifold should first be removed by unbolting thehead bolts (see Figure 1). The top gaskets are then removed. The activated carbon/catalyst may nowbe extracted using an industrial vacuum cleaner (the use of a suitable face mask is recommendedduring this operation).

Replacement activated carbon/catalyst packs are available from domnick hunter (see table 2). Theuse of a snow storm filling device (see table 2) is essential to achieve maximum packing of newcarbon/catalyst. New gasket seals should be fitted. The top manifold replaced and head boltstightened in sequential manner to a torque of 25 lb.ft (34Nm).

Note - Do not attempt to remove manifolds or replace activated carbon/catalyst whilst AC purifier ispressurised. Always open manual drain valve (on underside of inlet manifold) to check that purifier isnot pressurised.

3. MAINTENANCE

Table 2

Note - If replacing both top and bottom manifolds please order 2-off of the Gasket Seal Kits.

3. Maintenance Plans

domnick hunter offers service plans which are tailored to each customer’s requirements. Throughthese plans, the service/maintenance responsibility becomes domnick hunter’s . For details pleasecontact our Service Department.

domnick hunter

dh

User Guide

OIL-XFilters for compressed air and gasses

0009G-0620G(PF, AO, AA, ACS, AX, AR, AAR)

AC-0006G-0085G

41

?THIS FILTER MUST BE INSTALLED AND MAINTAINED BY A

COMPETENT PERSON

TECHNICAL SPECIFICATION

Maximum working pressure and temperature

with auto drain

16 bar g • 232 psi

with manual drain

20 bar g • 290 psi AO, AA, AR

1.5°C(35°F)

66°C(151°F)

AC, ACS

1.5°C(35°F)

30°C(86°F)

42

PF AO AA

ACAC

INSTALLATION

PF AO AA ACS

PF AO AA

ACSPF AO AA

43

MAINTENANCE

SEE ACCESSORIES

0205G-0620G0009G-0145G

AC-0006G-0085G

A B C

B

B

B

C

C

C

A

A

A

44

FILTER ELEMENT REPLACEMENT

(1) ISOLATE AIR SUPPLY

(2) DEPRESSURISE FILTER HOUSING

(3)

(6)

(4)

!

PF, AO, AA, ACS, AX, AR, AAR

0009G-0620G

(5)

(7)

45

FILTER ELEMENT REPLACEMENT

(1) ISOLATE AIR SUPPLY

(2) DEPRESSURISE FILTER HOUSING

AC0006G-0085G

46

FITTING DIFFERENTIAL PRESSURE GAUGE

!ISOLATE AIR SUPPLY

DEPRESSURISE FILTER HOUSING

DPG DPGL DPI

1/2AA

47

ACCESSORIES

AUTOMATIC DRAIN MANUAL DRAIN

No. 60864

0009G MBK10017G-0030G MBK20058G-0145G MBK30205G-0330G MBK40405G-0620G MBK5

MOUNTING BRACKET KIT FIXING KIT

DPISGK1

No. 69203

0009G FXK10017G-0030G FXK20058G-0145G FXK30205G-0330G FXK40405G-0620G FXK5

0009G MAK10017G-0030G MAK20058G-0145G MAK30205G-0330G MAK40405G-0620G MAK5

DPGL DPG

48

DECLARATION OF CONFORMITY

98/37/EC

Name of manufacturer or supplier:

domnick hunter limited

Full postal address including country of origin

Dukesway, Team Valley Trading Estate,

Gateshead, Tyne & Wear, England, NE11 0PZ

Description of product OIL-X FILTERS FOR COMPRESSED AIR AND GASSES

Name type or model, batch or serial number

PF, AO, AA, ACS,AX, AR, AAR-0009G-0620G AC-0006G-AC-0085G

Standards used, including number, title,

issue date and other relative documents

EN292-1:1991 EN 292-2:1991

Place of issue: GATESHEAD, TYNE & WEAR, ENGLAND

Name of authorised representative

ERIC W. BLAKIE

Position of authorised representative

MANAGING DIRECTOR (INDUSTRIAL DIV.)

Full postal address if different from manufacturers

Declaration

I declare that as the authorised representative, the above information in

relation to the supply/manufacture of this product, is in conformity with the

stated standards and other related documents following the provisions of

the 98/37/EC Directive.

Signature of authorised representative:

GB

Declaration of Conformity

Installation, Operating & Maintenance Instructions

domnick hunter

dh


50

CO MONITOR GENERAL DETAILS

Sample/testGas Inlet LED Display Test Button

80mm(3.15")

160mm (6.30")85mm depth (3.35")

90dba Alarm Horn

Remote AlarmConnection

ElectricalConnection

FromTransformer

Exhaust Gas

MODE

UP

DOWN

ENTER

PPMCO


1.1 The ANOLOX 3050 instrument is designed to measure and indicate the concentration ofCarbon Monoxide (CO) in the gas sample presented to its input port. The range ofmeasurement can be specified by the user, but the present design is configured for 0 to50ppm with a resolution of approximately 0.3ppm.

1.2 CO concentration is measured using an electro-chemical sensor the electrical signal isthen passed to a microprocessor, which carries out the following functions :

a. Linearisation of the signal using calibration constants.b. Conversion of the signal into a form, suitable for the instrument display.c. Monitoring for an alarm condition with reference to a pre-set level.d. Provide facilities for audible and visual gas alarms.e. Provide simple means of user calibration.f. Provide authorised personnel access to change the alarm set-point.g. Carry out continuous monitoring of the battery condition and warns when low.

2.1 SWITCHING ON

When the instrument is first switched on, it carries out a self test procedure and duringthis operation, the display will show the word ‘TEST’. This procedure takes about 5seconds and also allows a period for the electro-chemical sensor to stabilise. After thistime, the instrument is ready to monitor the input gas.

2.1.1 Carbon monoxide concentration in the input sample is indicated on the 4 Digit LCDdisplay.

2.2 GAS ALARM

2.2.1 As long as the measured CO concentration remains below the pre-set alarm level (see2.2.4), the relay will be energised and the normally open contact will be connected to thecommon contact. The alarm LED and audible alarm will be inactive.

2.2.2 If the CO concentration exceeds the pre-set alarm level, then the following actions willtake place :

a. The relay will de-energise resulting in the common contact connecting to thenormally closed contact and breaking the connection to the normally open contact.

b. The alarm LED will be turned on.c. The audible alarm will be activated.

2.2.3 These conditions will prevail until the measured CO concentration drops 1ppm below thealarm set-point.

2.2.4 The alarm set-point value depends on local health and safety regulations and variesdepending on country of use. The instruments are normally pre-set at the factory to10ppm but authorised personnel may be instructed on the procedure for changing thissetting.

51


2. OPERATION

52

2.3 CALIBRATION

2.3.1 This is a fairly simple procedure which should be carried out at least every 12 months, or afterchanging the sensor. Calibration requires a source of clean, CO free air or nitrogen, and a mixture ofCO/air of concentration around 50ppm CO.

IT SHOULD BE CARRIED OUT WITH CARE, SINCE THE ACCURACY OF THE SUBSEQUENTREADINGS IS ONLY AS GOOD AS THE ACCURACY OF THE LAST CALIBRATION.

2.3.2 The procedure uses the four membrane keys on the front panel, just to the left of the display,marked ‘MODE’, ‘UP’ , ‘DOWN’ and ‘ENTER’ . The keys carry out simple functions allowing the ‘zero’and ‘span’ calibration points to be entered.

2.3.3 The information entered during this procedure is stored in non-volatile memory which means that itis not lost when the Instrument is switched off or when the battery is being replaced.

2.3.4 The basic key functions are :

a. ‘MODE’ key - is used to initiate the calibration process. It also acts as an abort key, if say thecalibration process is entered accidentally or the user realises that a wrong value has been enteredand he wishes to cancel the operation.

b. ‘UP’ key - is used to increment the displayed value, during the span calibration process. 1 is added to the displayed value, each time the key is pressed and released.

c. ‘DOWN’ key - is used to decrement the displayed value, during the span calibration process. 1 issubtracted from the displayed value, each time the key is pressed and released.

d. ‘ENTER’ key - is used to confirm the end of each step in the calibration procedure. When pressedand released it automatically advances the calibration process to the next level.

2.3.5 During the first two stages of the calibration procedure, a 3 digit number will appear on the display.These numbers DO NOT actually mean anything to the user, they are only used to indicate a steadyinput condition.

2.3.6 Setting zero - connect a source of clean air or nitrogen to the calibration or gas inlet and adjust theflow rate to between 30 and 60 Litres/Hour. Press and release the ‘MODE’ key once. The display willshow three short horizontal bars in the left hand digit position followed by three numbers. As the‘zero’ gas flows, the numbers on the display will change. Wait until the reading is steady (the righthand digit may flicker (1 Digit) and then press the ‘ENTER’ Key. The display will change to show‘CXXX’ where XXX are the three digits which were displayed before the ‘ENTER’ key was pressed.

2.3.7 Setting span - connect a source of air/CO having a concentration of around 50ppm CO and adjustthe flow rate to between 30 and 60 litres/hour. Observe the display and ensure that the numeric valueis increasing. Wait until the reading is steady - this should occur at about 200 with a 50ppm air/COmixture. When the reading is steady, press and release the ‘ENTER’ key. The display will then changeto show ‘E050’.

NOTE : If a reading of between 180 and 220 cannot be achieved then the sensor is probablyexhausted. The calibration procedure should be aborted by pressing the ‘MODE’ key and thesensor should be replaced. (See section 3.2 below).

2.3.8 Setting the gas concentration - when the display is showing ‘E050’, pressing and releasing the ‘UP’key will add 1 to the displayed value and pressing the ‘DOWN’ key will subtract 1 from the displayedvalue. Use the ‘UP’ and ‘DOWN’ keys to change the displayed reading to match the actualconcentration of the air/CO mixture being used. When the air/CO concentration

53

reading is correct, press the ‘ENTER’ key and the process is complete.

2.3.9 Note that there are built-in upper and lower limits for the air/CO gas concentration. These are set at55ppm and 35ppm respectively. Values outside these limits, cannot be entered during the process in2.4.8

2.3.10 The procedure may be aborted at any time up to this point, simply by pressing the ‘MODE’ key. Thedata entered during the previous calibration will then be used to linearise the measurement.

2.3.11 Pressing the keys in combinations other than as described above, will have no effect on theInstrument’s operation. During the operation of the keys the actual effect of the key only takes placewhen it is released.

3.1 Sensor replacement - the electrochemical sensor has a life, in air, of about 18 months. However, thiswill be shortened if it is constantly subjected to carbon monoxide, particularly high concentrations.

3.1.1 Switch off the instrument and disconnect the DC supply. Undo the four corner screws in the frontpanel (they are captive in the front panel) and carefully withdraw the panel from the housing body.Disconnect the wiring loom from the front panel by releasing the small retaining clips on the 2 x whiteplastic connectors and remove the front panel. Locate the sensor cell - this is a 32mm diametercomponent at the end of the printed circuit board. It is a plug-in device having 4 small pins. Carefullyease the sensor out of its 4 sockets.

3.1.2 Replacement sensors are supplied in a gas tight package, which should NOT be opened until theyare to be fitted in an instrument. Examine the new sensor and note that there is a thin spring shortingclip fitted to three of the gold pins. Remove this spring clip and carefully fit the new sensor in to the 4PCB sockets, ensuring that it is secure. Check that the ‘O’ ring seal is correctly located on the front ofthe sensor and that there is no foreign matter on the face of the seal. At this point, it is a good policyto make a note of the sensor serial number and enter the date of replacement in a record book, sothat the next replacement may be anticipated.

3.1.3 Refit the white plastic connectors on the front panel and refit the front panel to the housing bodychecking that the orientation is correct, i.e. that the sensor will mate with the gas flow adaptor in thehousing body. Secure the 4 corner screws and re-connect the battery.

3.1.4 Switch on the instrument and allow the new sensor to settle for about 30 minutes, then carry out afull calibration procedure, as described in section 2 above.

3.1.5 There are no other user-serviceable parts in the instrument. If the instrument fails to perform asexpected, then contact domnick hunter ltd for assistance.

3. MAINTENANCE

54

All replacement parts are available directly from domnick hunter ltd or its approvedagents. The adoption of a regular servicing policy is strongly recommended and will helpto ensure that correct performance is achieved and maintained.

Serial numbers and customer order numbers should be referred to in any communicationsregarding this equipment. Any warranty will be invalidated if any part is substituted with anon-original manufacturers part. Substitute parts could reduce the performance or servicelife of this equipment in addition to creating potential hazards.

domnick hunter ltd standard conditions of sale and warranty apply to this equipment.

55

INTERNAL AND EXTERNAL WIRING LOOMS V4

dh, and domnick hunter, are registered trademarks of domnickhunter limited.

a member of the domnick hunter group plc Copyright domnick hunter limited 1999Stock No: 176033090 REV 002

domnick hunter limited has a continuous policy of productdevelopment and although the Company reserves the right to changespecifications, it attempts to keep customers informed of any alterations.This publication is for general information only and customers arerequested to contact our Industrial Division Sales Department fordetailed information and advice on a products suitability for specificapplications. All products are sold subject to the Company’s standardconditions of sale.

domnick hunter limitedDukesway, Team Valley Trading Estate,

Gateshead, Tyne and Wear,England NE11 0PZ

Tel: +44 (0)191 402 9000 Telefax: +44 (0)191 482 6296

http://www.domnickhunter.com

Your Partner in

Compressed Air TreatmentYour Partner in

Compressed Air Treatment

For the latest information visit the domnick hunterwebsite on http://www.domnickhunter.com

domnick hunter pty ltdTel: +61 (0)3 9762 9922Telefax: +61 (0)3 9762 9911

hb-domnick hunterequipamentos ItdaTel: +55 (0)11 3766-3977Telefax: +55 (0)11 3768-1421

domnick hunter Canada incTel: (905) 820-7146Telefax: (905) 820-5463Toll Free: 1-888-342-2623

domnick hunter ChinaTel: +86 10 646 33523 Telefax: +86 10 646 33521

domnick hunter Skandinavien A/STel: +45 47 38 06 44 Telefax: +45 47 38 06 43

domnick hunter France S.A.Tel: +33 4 74 62 34 51 Telefax: +33 4 74 62 35 44

domnick hunter gmbhTel: +49 (0) 2151 83660 Telefax: +49 (0) 2151 395779

domnick hunter India Pvt LtdTel: +91 11 61 92172 Telefax: +91 11 6185279

P.T. domnick hunterIndonesia Tel: +62 21 458 40488 Telefax: +62 21 452 4323

domnick hunter NihonTel: +81 (0)78 391 8055 Telefax: +81 (0)78 391 8056

domnick hunter - RL(Malaysia) Sdn BhdTel: +60 3 733 3415 Telefax: +60 3 735 1699

domnick hunter group PolskaTel: +48 22 7230367 Telefax: +48 22 7230368

domnick hunter group PteLtdTel: +65 744 4088 Telefax: +65 744 9959

domnick hunter IbericaTel: +34 93 351 4807Telefax: +34 93 351 7102

domnick hunter SweTec ABTel: +46 (0)31 748 0610 Telefax: +46 (0)31 748 0621

domnick hunter - RL(Thailand) Co. LtdTel: +66 2 255 5305Telefax: +66 2 255 5340

domnick hunter incTel: +1 (704) 921 9303Telefax: +1 (704) 921 1960Toll Free: 1-800-345-8462

ORDEM e PROGRESSO

dh

307 domnick hunter air compressor

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