gas switching accessory manual - tke · 2015. 9. 7. · gas switching accessory 2 ta instruments...

TA INSTRUMENTS GAS SWITCHING ACCESSORY 1

109 Lukens Drive New Castle, DE 19720

Thermal Analysis & Rheology

A SUBSIDIARY OF WATERS CORPORATION

Gas Switching Accessory

Operator's Manual

PN 992305.001 Rev. BIssued August 1999


2 TA INSTRUMENTS GAS SWITCHING ACCESSORY

© 1997, 1999 by TA Instruments, Inc.109 Lukens DriveNew Castle, DE 19720

Notice

The material contained in this manual is believedadequate for the intended use of this instrument.If the instrument or procedures are used forpurposes other than those specified herein,confirmation of their suitability must be obtainedfrom TA Instruments. Otherwise, TA Instru-ments does not guarantee results and assumesno obligation or liability. This publication is not alicense to operate under or a recommendation toinfringe upon any process patents.

TA Instruments TA Operating System, Instru-ment, Data Analysis, and Utility Software andtheir associated manuals are proprietary andcopyrighted by TA Instruments, Inc. Purchasersare granted a nonexclusive, nontransferablelicense to use these software programs on theinstrument and controller with which they werepurchased. These programs may not be dupli-cated by the purchaser without the prior writtenconsent of TA Instruments. Each licensedprogram shall remain the exclusive property ofTA Instruments, and no rights or licenses aregranted to the purchaser other than as specifiedabove.


Table of ContentsNotes, Cautions, and Warnings .......................4

Ordering Information ......................................5

Safety ..............................................................7

CE Compliance .........................................7

Electrical Safety .......................................8

Operating Safety ......................................8

Introducing the GSA .......................................9

Description ...............................................9

Specifications ..........................................11

Principles of Operation ...........................12Auto Mode .......................................12Manual Mode ...................................13

Installing the GSA .........................................15

Unpacking the GSA................................15

Choosing a Location ...............................15

Connecting the GSA ...............................16

Operating the GSA .......................................20

The GSA Front Panel .............................20

The GSA Rear Panel .............................22

Using the GSA .......................................23

Maintaining the GSA.....................................25

Fuse Replacement ..................................25

Table of Contents



Notes, Cautions and WarningsThis manual uses Notes, Cautions, and Warningsto emphasize important and critical instructions.

A NOTE highlights important information aboutequipment or procedures.

A CAUTION emphasizes a procedure that maydamage equipment or cause loss of data if notfollowed correctly.

A WARNING indicates a procedure that may behazardous to the operator or to the environ-ment if not followed correctly.

t CAUTION:

NOTE:

!WARNING


Ordering InformationTA Instruments, Inc.109 Lukens DriveNew Castle, DE 19720Telephone: 1-302-427-4000 or 1-302-427-4040Fax: 1-302-427-4001

HELPLINE�U.S.A.For technical assistance with current orpotential thermal analysis applications,please call the Thermal Analysis Help Deskat 1-302-427-4070.

SERVICE�U.S.A.For instrument service and repairs,please call 1-302-427-4050.

TA Instruments Ltd.Europe House, Bilton CentreCleeve RoadLeatherhead, Surrey KT22 7UQEnglandTelephone: 44-1372-360363Fax: 44-1372-360135

TA Instruments GmbHMax-Planck-Strasse 11D-63755 AlzenauGermanyTelephone: 49-6023-9647-0Fax: 49-6023-9647-77

TA Instruments BeneluxOttergemsesteenweg 461B-9000 GentBelgiumTelephone: 32-9-220-79-89Fax: 32-9-220-83-21

Ordering Information



TA Instruments JapanNo. 5 Koike Bldg.1-3-12 KitashinagawaShinagawa-Ku, Tokyo 140JapanTelephone: 813/3450-0981Fax: 813/3450-1322

TA Instruments FranceB.P. 60878056 Saint-Quentin-YvelinesCedexFranceTelephone: 33-1-30-48 94 60Fax: 33-1-30-48 94 51

TA Instruments SpainWaters Cromatografía, S.A.División TA InstrumentsAvda. Europa, 21. Pta. Baja28108 AlcobendasMadrid, SpainTelephone: 34-91-661-8448Fax: 34-91-661-0855

TA Instruments AustraliaUnit 338-46 South StreetRydalmere NSW 2116AutstraliaTelephone: 61-29-9331-705Fax: 61-29-8981-455

TA Instruments ItalyDivision of Waters SpAvia Achille Grandi 2720090 Vimodrone (MI), ItalyTelephone: 39-02-27421-1Fax: 39-02-250-1827

Printed in U.S.A.


SafetyRead this section and understand the Safetyprecautions before proceeding with installing orusing the GSA.

This accessory has been designed to complywith the following standards on safety:

� IEC 1010-1/1990, A1/1992, and A2/1995� IEC 1010-2-010/1992, A1/1996� UL 3101-1, First Edition.

CE ComplianceIn order to comply with the requirements ofCouncil Directive 89/336/EEC (EMC Directive)and Directive 73/23/EEC (Low Voltage Direc-tive), as amended by 93/68/EEC, the followingspecifications apply to the Gas Switching Acces-sory:

� Safety:EN 61010-1/1993 and A2/1995EN 61010-2-010/1994

� Emissions:EN 55022:1995, Class B (30-1000 MHz)RadiatedEN 55022:1995, Class B (0.15-30 MHz)Conducted

� Immunity:

EN 50082-1: 1992, ElectromagneticCompatibility�Generic immunity standardPart 1. Residential, commercial, and lightindustry.� IEC 801-2: 1991. Electrostatic Dis-

charge.� IEC 801-3: 1984. Radiated RF Immu-

nity.� IEC 801-4: 1988. Electric Transients.

Safety



Electrical Safety

Voltages up to 120 Vac are present in thissystem. Always disconnect the unit from thepower source before performing any mainte-nance.

DO NOT REMOVE THE CABINET COVERS.Dangerous voltages are present in this instru-ment. Repair procedures requiring internalaccess to this compartment must be per-formed only by TA Instruments or otherqualified service personnel.

Operating Safety

When operating the GSA, keep in mind that themaximum pressure allowable is 138 kPa (20 psi),using the following gases: nitrogen, oxygen, air,helium, or argon. If you want to use any othergases, contact the TA Instruments HelpLine forinformation.

When using oxygen with the GSA, you must beable to minimize the buildup of oxygen in orderto avoid a fire hazard. We recommend that youeither direct the vent gas to an exhaust systemor operate in an environment that has adequateventilation to ensure sufficient dilution.

!WARNING

!WARNING


Introducingthe GSA

The TA Instruments Gas Switching Accessory(GSA) allows you to manually or automaticallyswitch purge gases during your experiments. Itcan be used with any of the appropriate ThermalAnalysis instruments.

This manual provides the information necessaryto understand, install, operate, maintain, andorder parts for the TA Instruments Gas Switch-ing Accessory (PN 992300.901).

Specifications in this manual are given in theInternational System of Units (Sl), with Englishequivalents in parentheses.

Description

The Gas Switching Accessory is a solenoid-controlled gas manifold which enables selectiveswitching between two purge gases. The GSAhas two modes of operation, automatic andmanual. In the AUTO(matic) mode the GSA iscontrolled with a contact closure in the thermalanalyzer through an interconnecting cable. TheMANUAL mode permits operator control of thegas switching by a front panel switch. SeeFigure 1 for an illustration of the front panel.See page 17 for operation of the front panel.

NOTE:

Introducing the GSA



Figure 1Gas Switching AccessoryFront Panel

The rear panel of the Gas Switching Accessory,shown in Figure 2, provides entry connections fortwo purge gases, an exit gas connection to theinstrument, an exhaust vent connection, twoelectrical input connectors for automatic activa-tion/deactivation of the solenoid manifold, powerswitch, and a power entry instrument AC-lineconnector.

Figure 2Gas Switching AccessoryRear Panel

50 mA 250 V

35 mA


Introducing the GSA

Specifications

The specifications for the Gas Switching Acces-sory are found in the table below.

Table 1GSA TechnicalSpecifications

Dimensions Depth: 25.4 cm (10")Width: 21.6 cm (8.5")Height: 11.4 cm (4.5")

PowerRequirements 120 Vac + 10 %,

50/60 Hz

Weight 2.9 kg (6.4 lb)

Energy 4.2 wattsConsumption

Control Front panel switchselection. Rear panelremote, J2, J3.

Fuse Type 35 mA, Type T, 250 V

Flow Rate Up to 1 L/min

Automatic Input jacks locatedGas Control on rear panel of GSA

Maximum 138 kPa (20 psi)

Pressure Relief Both input lines haveValves a 175 kPa (25 psi)

pressure relief valve.

Operating 15 to 30°CTemperature



Principles of Operation

Two solenoid valves and two metering valvesare the main elements of the Gas SwitchingAccessory. A printed circuit board is used tocontrol the solenoid valves.

Two purge gases, designated as GAS 1 andGAS 2, are admitted to the gas switchingaccessory through two separate inlet ports.

� One gas flows from the INSTRUMENTport to the instrument.

� The second, �unused� gas flows out theVENT port to an exhaust system.

Gas switchover is accomplished by electricallyactivating the solenoid valves.

The next two sections provide general informa-tion on the two modes of operation: automaticand manual. For details on operating the GSAturn to page 20.

Auto ModeIf you want to program gas selection into anexperimental method automatically, through theuse of the instrument control software, you willfirst need to place the GSA in automatic mode.To do this, push the OPERATION pushbuttonswitch on the GSA front panel until it is in theAUTO mode. When the accessory is in theAUTO mode, activation of the solenoid valves isaccomplished by means of contact closure(completion of the circuit) in the thermal ana-lyzer.


When the gas solenoid valves are deactivated:

� GAS 1 flows to the INSTRUMENT port� GAS 2 flows to the VENT port.

Conversely, when the solenoid valves areactivated:

� GAS 2 flows to the INSTRUMENT port� GAS 1 flows to the VENT port.

GAS 1 may also be directed to the INSTRU-MENT port by disconnecting the contact closurecable.

After the GSA is in automatic mode, you canturn purge gas 1 and 2 on or off using theInstrument Control software. See thesoftware�s online documentation for informationon how to include gas control in an experimentalmethod, if desired.

Manual Mode

If you want to manually choose a particularpurge gas flow to the instrument, you can switchto MANUAL mode by following these steps:

1. Push the OPERATION pushbutton switch sothat it is in the MANUAL position. This willoverride the automatic operation.

2. Use the SELECT pushbutton switch tochoose either GAS 1 or GAS 2 to flow to theINSTRUMENT port. The SELECTpushbutton switch only functions when theOPERATION pushbutton switch is in theMANUAL mode.

Introducing the GSA



A typical mode of operation for the Gas Switch-ing Accessory during actual experiments uses aninert gas such as nitrogen to be GAS 1, and areactive gas such as oxygen to be GAS 2.Typical end-use applications include oxidativestability studies and TGA decomposition analy-ses.


Installingthe GSA

The Gas Switching Accessory can be used withvarious thermal analysis instruments, such as theDSC and TGA. This section describes unpack-ing, selecting a location, and installing the GSA.

Unpackingthe GSA

The accessory was inspected mechanically andelectrically before shipment. After unpacking,inspect the accessory for mechanical damage.If it is damaged in transit, or fails to operateproperly upon receipt, notify the carrier and TAInstruments immediately. Also check that youreceived all items on the shipping list.If any item is missing, notify TA Instrumentsimmediately.

Choosinga Location

Because of the sensitivity of many experiments,it is important to choose a location for theinstrument using the following guidelines:

In . . . a temperature-controlled area.. . . a clean environment.. . . an area with ample working

space around the accessory. (Referto the technical specifications onpage 11 for the dimensions.)

Installing the GSA



Near . . . a power outlet (120 Vac, 50 or 60 Hz,10 amps). A step up/down line trans-former may be required if the unit isoperated from a higher or lower linevoltage.

. . . your TA Instruments thermal analysiscontroller and instrument.

. . . purge gas supply for use duringexperiments.

Your air source must be clean, dry, and oil-freeto ensure proper operation.

Connectingthe GSA

To connect the Gas Switching Accessory toeither the Module Interface, a 2900 seriesinstrument, or a 2000 series instrument, followthe directions below. See Figure 3 on page 18 foran example of the installation of the GSA to aDSC instrument. See Figure 4 on page 19 forthe installation of the GSA to a TGA instrument.

1. Plug the power cord (PN 890035.901 for CEinstruments) into the connection on the GSArear panel. Then plug the cord into yourprimary power source outlet. (Your powersource should be 120 Vac only�if yourmain voltage is higher or lower, a trans-former will be required.)

2. Connect the appropriate cable between theGAS connector on the instrument and jacksJ2 (+) and J3 (-) on the Gas SwitchingAccessory. (Use cable PN 990906.901for 2900/2000 series instruments,

t CAUTION:


PN 890014.901 for CE instruments, or PN992119.901 for MIM-based instruments.)

The cable connectors may differ slightly inappearance, depending on the instrumentinvolved.

The GSA can be used with the following gases:nitrogen, oxygen, air, helium, or argon. If youwant to use any other gases, contact the TAInstruments HelpLine for information.

3. Connect the lines from the purge gassources to the appropriate inlet ports on therear panel of the GSA. To facilitate thehookup of rubber tubing to the four threaded,brass gas fittings on the rear of the GasSwitching Accessory, install the four ta-pered, 1/4-inch brass tube hose connectors(PN 992302.001).

Install the brass hose connectors until they arefinger tight and then tighten them with a wrenchuntil significant resistance is felt. Do notovertighten!

Inert gases (such as nitrogen) are typicallyconnected to the GAS 1 inlet, and reactivegases (such as oxygen) are connected to theGAS 2 inlet.

4. Connect the INSTRUMENT outlet line fromthe rear panel of the GSA to a flowmeter.Connect the outlet end of the flowmeter tothe desired TA instrument.

5. Connect the VENT line on the rear panel ofthe GSA to a hood or some other appropriateexhaust system.

Installing the GSA

!WARNING

NOTE:

t CAUTION:

NOTE:



Figure 3Typical Gas SwitchingAccessory Installation toa DSC 2910 or 2920 Instrument

Vent Flowmeter

Gas SwitchingAccessory

DSC Instrument


Figure 4Typical Gas SwitchingAccessory Installation toa TGA 2950 or 2050 Instrument

Installing the GSA

Flowmeter

TGA Instrument

Gas SwitchingAccessory

BalancePurge

FurnacePurge

This configuration maintains an inertpurge through the TGA balance chamber.



Operatingthe GSA

Before operating the GSA, it is important tobecome familiar with the various items locatedon the front and rear panels of the accessory.

The GSAFront Panel

Figure 5 provides an illustration showing thefront panel and its controls. (See Figure 6 forthe rear panel items.) Refer to Table 2 (on thenext page) for a description of each item on thefront panel.

Figure 5GSA Front Panel

OPERATIONPushbuttonSwitch

SELECTPushbuttonSwitch

Gas IndicatorLights

FlowRegulationKnobs


Table 2GSA FrontPanel Controls

Name Description

SELECT A two-position switchpushbutton that allows you toswitch select either GAS 1 or

GAS 2.

This switch functionsonly when the OPERA-TION pushbutton switchis in the MANUAL mode.(This switch can be usedto test operation of theGSA for troubleshootingpurposes.)

OPERATION A two-position pushbut-pushbutton ton switch that enablesswitch you to manually control

the selection of gases orplace the accessory inAUTO mode.

Gas Indicator Two indicator lights thatLights light selectively to

indicate which purge gasis flowing to the instru-ment.

Flow Regulation Used to regulate the flowKnobs of gases to the instrument

and to the vent.

Operating the GSA



NOTE:

Connectors forGas Lines

Connectionfor PowerCable

POWERSwitch

Connectorsfor Cable

50 mA 250 V

35 mA

Flow regulation knobs are not to be used as “on-off” valves.

The GSARear Panel

Figure 6 provides an illustration showing therear panel. (See Figure 5 for the front panelitems.) Refer to Table 3 below for a descriptionof the rear panel power switch.

Figure 6GSA Rear Panel

Table 3GSA RearPanel Control

Name Description

POWER Controls power to theswitch accessory. The �O�

position is off.


Using the GSA

Follow these steps to start and operate the GasSwitching Accessory.

1. Adjust the regulator valves on the pressur-ized gas supply tanks to 14 to 35 kPa(2 to 5 psi).

Do not exceed a supply tank pressure of 138kPa (20 psi).

2. Press POWER switch on the Gas SwitchingAccessory rear panel to the ON position.

3. Press the SELECT pushbutton switch to theGAS 1 position (switch shows a highprofile).

4. Press the OPERATION pushbutton switchto the MANUAL mode position (switchshows a low profile). The indicator light forGAS 1 should light.

Do not exceed an inlet pressure of 138 kPagauge (20 psi).

5. Set the GAS 1 flow rate to the instrument byadjusting the GAS 1 knob on the GSA frontpanel for the desired flow rate (typically 50to 75 mL/min) as indicated on a flowmeter(not supplied). A flowmeter needle valvemay also be used in combination with theGAS 1 knob to obtain the required flow rate.

6. Press the SELECT pushbutton switch to theGAS 2 position.

!WARNING

!WARNING

Operating the GSA



NOTE:

7. Set the GAS 2 flow rate to the instrument byadjusting the GAS 2 knob on the GSA frontpanel for the desired flow rate (typically 50to 75 mL/min) as indicated on a flowmeter(not supplied). A flowmeter needle valvemay also be used in combination with theGAS 2 knob to obtain the required flow rate.

If you want to conserve gas, you can connect arestrictor or another flowmeter to the vent outletand adjust the flow rate accordingly using theneedle valve on the flowmeter. If the vent flow isrestricted too much, a pressure spike may occurwhen the GSA switches from GAS 1 to GAS 2.The pressure spike may appear in your data.

8. Press the OPERATION pushbutton switchto the AUTO mode position. The GSA isready for operation.

9. Use the controller software to set up andstart the experiment.


Maintaining the GSA

Maintainingthe GSA

The TA Instruments Gas Switching Accessoryonly requires an occasional cleaning for mainte-nance of proper operation. To clean the GSA,simply wipe any dirt or dust off the accessoryusing a cloth that has been damped with waterand a mild detergent, if desired.

Fuse Replacement

If the fuse should need replacement, followthese instructions to remove and replace a blownfuse.

1. Important: Unplug the power cord beforeperforming any further steps.

2. Slip the end of a small screwdriver under thefuse carrier tab and slide the carrier out ofthe GSA.

3. Remove the blown fuse from the fusecarrier. A spare fuse is located in a smallcompartment in the fuse carrier. You canremove the spare fuse by sliding out thecompartment drawer using the end of thescrewdriver.

4. Insert the new fuse in the plastic clip.

5. Obtain a new 35 mA, Type T, 250 V fuseand place it in the spare fuse compartment.Then replace the compartment and slide thefuse carrier back into the GSA.

gas switching accessory manual - tke · 2015. 9. 7. · gas switching accessory 2 ta instruments...

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