Gas Cooling Accessory - TKE€¦ · Cooling Accessory for your protection: Symbol Explanation Indicates the presence of a hazard related to the area or part indicated. Please heed

iTA INSTRUMENTS GAS COOLING ACCESSORY

PN 991426.001 Rev. D (Text and Binder)PN 991426.002 Rev. D (Text Only)Issued November 1999

TA Instruments

Thermal Analysis & Rheology

A SUBSIDIARY OF WATERS CORPORATION

GasCoolingAccessory

Operator's Manual

109 Lukens Drive New Castle, DE 19720

TA INSTRUMENTS GAS COOLING ACCESSORYii

© 1996, 1997, 1998, 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 any results andassumes no obligation or liability. This publica-tion is not a license to operate under or a recom-mendation to infringe upon any process patents.

TA Instruments TA Operating Software andModule, Data Analysis, and Utility Software andtheir associated manuals are proprietary andcopyrighted by TA Instruments, Inc. Purchasersare granted a license to use these softwareprograms on the module and controller withwhich they were purchased. These programsmay not be duplicated by the purchaser withoutthe prior written consent of TA Instruments.Each licensed program shall remain the exclusiveproperty of TA Instruments, and no rights orlicenses are granted to the purchaser other thanas specified above.

iiiTA INSTRUMENTS GAS COOLING ACCESSORY

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

EMC Conformity Specifications .................. vii

Safety .......................................................... viii

Instrument Symbols .............................. viii

Warning! ................................................. ix

Safe Handling of Cryogenic Materials .....x

Handling Liquid Nitrogen ..........................x

If Burned by Liquid Nitrogen ................. xi

Room Ventilation .................................... xi

Oxygen Absorption ................................. xi

Pressure Buildup ................................... xii

Water Condensation ..............................xiv

Electrical Safety ....................................xiv

Lifting the Instrument ............................xiv

Chapter 1: Introducing the GCA ......... 1-1

Introduction ................................................. 1-3

Specifications .............................................. 1-4

Theory of Operation .................................... 1-6

Table of Contents

TA INSTRUMENTS GAS COOLING ACCESSORYiv

Description of Components. ........................ 1-8

Top Section of GCA........................... 1-10

Chapter 2: Installing the GCA ............. 2-1

Unpacking and Inspecting ........................... 2-3

Before Installation ................................ 2-3

Choosing a Location ............................. 2-5

Help Lines ................................................... 2-6

Installing the GCA....................................... 2-7

Installing the Drain Valve ................... 2-12Updating the Software ....................... 2-14

Changing the Settings .................. 2-20

Chapter 3: Filling andUsing the GCA ......................................... 3-1

Introduction................................................. 3-3

Autofilling the GCA .................................... 3-4

Autofilling the GCA forthe First Time ....................................... 3-5

Refilling the GCA Afteran Experiment....................................... 3-6

Manually Filling the GCA........................... 3-7

Table of Contents

vTA INSTRUMENTS GAS COOLING ACCESSORY

Operating Your GCAwith the DMA ........................................... 3-11

Basic Operation .................................. 3-12

Appendix A: Parts Lists ....................... A-1

Parts Lists............................................ A-1

Electrical Safety .................................. A-2

Appendix B: Ordering Information .... B-1

Index ........................................................... I-1

Table of Contents

TA INSTRUMENTS GAS COOLING ACCESSORYvi

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 maybe hazardous to the operator or to the envi-ronment if not followed correctly.

t CAUTION:

NOTE:

Notes, Cautions, and Warnings

!WARNING

viiTA INSTRUMENTS GAS COOLING ACCESSORY

EMC Specifications

EMC SpecificationsIn order to comply with the requirements ofCouncil Directive 89/336/EEC (EMC Directive),the GCA has been tested and found to complywith the following standards on ElectromagneticCompatibility:

� Emissions:

EN 55011: 1991, CISPR 11:1990 Group 1Class B (30-1000 MHz) Radiated

EN 55011: 1991, CISPR 11:1990 Group 1Class 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 Discharge.

� IEC 801-3: 1984. Radiated RF Immunity.

� IEC 801-4: 1988. Electric Transients.

TA INSTRUMENTS GAS COOLING ACCESSORYviii

Safety

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

In order to comply with the requirements ofCouncil Directive 73/23/EEC (Low VoltageDirective), amended by 93/68/EEC, the GCAhas been evaluated and tested, and found tocomply with the following standards on safety:

� IEC 1010-1/1990, A1/1992, and A2/1995� IEC 1010-2-010/1992, A1/1996� EN 61010-1/1992� EN 61010-2-010/1994� UL 3101-1, First Edition.

Instrument Symbols

The following label is displayed on the GasCooling Accessory for your protection:

Symbol Explanation

Indicates the presence ofa hazard related to thearea or part indicated.

Please heed these labels and take the necessaryprecautions when dealing with those parts of theaccessory. The Gas Cooling AccessoryOperator's Manual contains cautions andwarnings that must be followed for your ownsafety. Refer to the information in this sectionfor specific information related to safety.

ixTA INSTRUMENTS GAS COOLING ACCESSORY

Potential Asphyxiant

Liquid nitrogen can cause rapid suffocation withoutwarning.

Store and use in an area with adequate ventilation.

Do not vent GCA container in confined spaces.

Do not enter confined spaces where nitrogen gasmay be present unless the area is well ventilated.

The warning above applies to the use of liquid nitrogen. Oxygendepletion sensors are sometimes utilized where liquid nitrogen isin use. Please refer to the rest of this section for more detailedinstructions regarding safety in the use of the GCA.

WARNING

TA INSTRUMENTS GAS COOLING ACCESSORYx

Safe Handling ofCryogenic Materials

Liquid nitrogen is used as a cooling agent inmany thermal analysis tests. Because of itsextremely low temperature (-196oC) it will burnskin. You must use extreme care when work-ing with liquid nitrogen or other cryogenicmaterials.

Liquid Nitrogen Can:

1. Cause serious skin burns2. Replace the air in the room you are in3. Generate very high pressures if trapped in

lines or containers.

Handling LiquidNitrogen

1. Wear goggles or a face shield and weargloves that are easily removed. Wear high-topped shoes with pant legs outside the topsfor extra protection.

2. Transfer the liquid slowly to prevent thermalshock to the container and excessive turbu-lence to the liquid nitrogen. If liquid nitrogenis poured into a container that is at roomtemperature, the liquid nitrogen will boilviolently. Use extreme caution to preventthe boiling liquid from contacting you.

3. Use only approved low temperaturecontainers.

4. Make sure liquid nitrogen containers arevented to prevent pressure buildup.

Safety

xiTA INSTRUMENTS GAS COOLING ACCESSORY

If Burned byLiquid Nitrogen

1. Flood the area (skin or eyes) IMMEDI-ATELY with large quantities of cool water,then apply cold compresses.

2. See a doctor IMMEDIATELY if the skin isblistered or if the liquid nitrogen came incontact with your eyes.

Room Ventilation

Liquid Nitrogen evaporates quickly at roomtemperature and could replace the air in a room.Only use liquid nitrogen in a well-ventilatedroom. Important�see the Warning on page ix.

Oxygen Absorption

Liquid Nitrogen will absorb oxygen from the air.It is possible for the purity of liquid nitrogen tochange as it evaporates from a container. If yoususpect a lot of liquid nitrogen has evaporatedthe remaining liquid should be analyzed foroxygen content before using if for any purposewhere high oxygen content is dangerous.

SafetySafety

TA INSTRUMENTS GAS COOLING ACCESSORYxii

Pressure Buildup

Liquid Nitrogen should not be stored in a sealedcontainer, as tremendous pressure could resultand an explosion is possible.

The GCA is designed to always be vented to theroom when not supplying nitrogen gas to the testinstrument. The pressure build up in the GCA,when it is supplying nitrogen gas to the instru-ment, is limited by the controller. Pressure reliefvalves are also designed into the system.

If the feed line pressure relief valve is venting,either the bulk storage tank pressure is too high,or the bulk storage tank valve has been closed,trapping liquid nitrogen in the feed tube. Verifythat gas is flowing through the vent and coolantfeed valve before continuing normal operation byrunning the following method:

1 Jump to -50°C2 Isothermal for 1 min.

� While the method is running vapor should becoming from the DMA furnace assembly.If no vapor is apparent, stop the method andcheck the coolant transfer tube forblockage. If no blockage is found, call TAInstruments for service. If a blockage isfound, clear it and run the method again.

� When the method has completed, you shouldhear gas venting from the GCA. If you donot hear the gas venting, call TAInstruments for service.

Safety

xiiiTA INSTRUMENTS GAS COOLING ACCESSORY

Always make sure the GCA system is installedcorrectly. Make sure the fill line from the bulkstorage tank is hooked up properly.

Never allow liquid nitrogen to be trapped in thefill line from the bulk storage tank to the GCA.

The sequence for opening and closing valves isimportant to prevent trapping liquid nitrogen inthe fill tube. When the bulk storage feed tube isconnected for autofilling, it is important that youdo not ever close the manual valve on the bulkstorage tank, unless the bulk storage tank isempty, or at least 15 minutes has elapsed sincethe solenoid valve at the GCA has closed. (Thesolenoid valve closes at the end of Autofill.) Thistime allows the liquid nitrogen to vaporize beforesealing the area between the solenoid valve andthe valve on the bulk storage tank.

Never remove the GCA Autofill line at the bulkstorage tank without closing the bulk storagetank valve first.

When connecting and removing the GCAAutofill line remember to wear goggles andgloves.

Do not use high pressure bulk tanks [greaterthan 25 psi (175 kPa)]. The GCA is designedfor lower pressure bulk tanks. Using highpressure tanks will cause the GCA to workimproperly and raise the potential for injury.

tCAUTION:

tCAUTION:

tCAUTION:

Safety

!WARNING

TA INSTRUMENTS GAS COOLING ACCESSORYxiv

Safety

Water Condensation

The GCA surfaces get cold during use of theGCA for both filling and supplying cold nitrogento the instrument. The cold surfaces causecondensation and, in some cases, frost to buildup. This condensation may drip to the floor.Provisions to keep the floor dry should be made.If any moisture does drip to the floor, be sure toclean it up promptly to prevent a slipping hazard.

Electrical Safety

High voltages (120 Vac) are present in thisinstrument, only qualified service personnelshould remove covers and make repairs.

The power at the instrument must be turnedoff, and the interface cable and power cordmust be removed before any service or repairwork is started.

Hazardous voltage is present inside the GCA.Do not remove the clamp securing the cap tothe dewar. There are no user-serviceableparts inside the GCA. Call TA Instruments forservice.

Lifting the Instrument

The GCA is a fairly heavy accessory. In orderto avoid injury, particularly to the back, pleasefollow this advice:

Roll the GCA on its wheels to move it, when-ever possible. If you must lift it, use twopeople to lift and/or carry the instrument.The instrument is too heavy for one person tohandle safely.

!WARNING

!WARNING

!WARNING

TA INSTRUMENTS GAS COOLING ACCESSORY 1–1

Chapter 1: Introducing the GCA

Introduction ................................................. 1-3

Specifications .............................................. 1-4

Theory of Operation .................................... 1-6

Description of Components. ........................ 1-8

Top Section of GCA........................... 1-10

TA INSTRUMENTS GAS COOLING ACCESSORY

Introducing the GCA

1–2


IntroductionThe GCA (Gas Cooling Accessory) is a coolingaccessory for use with the TA InstrumentsDynamic Mechanical Analyzer (DMA) 2980.

The GCA has been designed for automaticrefilling from a low pressure [25 psi (175 kPa)maximum] bulk storage tank that can be locatedwithin 6 feet (1.8 meters) of the GCA. TheGCA is also capable of being filled manually bydisconnecting it from the instrument and movingit to a bulk storage source.

Before proceeding, be sure you understand andfollow the safety precautions in the prefix of thismanual.

Introduction

NOTE:


Introducing the GCA

1–4

SpecificationsThe specifications in Tables 1.1, and 1.2 apply tothe Gas Cooling Accessory.

Table 1.1GCA TechnicalSpecifications

GCA Liquid 50 LitersNitrogenCapacity

Size 107 cm (42") high46 cm (18") in diameter

Powerrequirements 120 volts at 8 amps,

50-60 Hz.

Weight empty: 100 lbs (45.5 kg)full: 190 lbs (86.4 kg)

Cooling �145oCCapacity

Pressure Relief 10 psi (70 kPa) reliefvalve on tank.50 psi (345 kPa) on fillline.

(table continued)


Table 1.1(continued)

Liquid Transfer: 6 ft (1.8 m)Nitrogen insulated from GCATubes to instrument.

Feed: 6 ft (1.8 m) insulat-ed with shutoff solenoidfrom bulk storage toGCA.

GCA Automatic: Bulk storageFill Modes within 6 ft (1.8 m) of

GCA.

Manual: Remote filling atbulk storage location.

Bulk Storage Use low pressure supplyTank tank only. Recommended

filling pressure is 20 to 25psi (140 to 170 kPa).

The GCA vents to the atmosphere, if no filling ortesting is currently in progress.

Specifications

NOTE:


Introducing the GCA

1–6

Theory ofOperation

The GCA uses up to eight selectively switched100-watt heaters to vaporize the liquid nitrogenand obtain required pressures of up to 9 psi (62kPa). The pressurized gas is forced out of thetank and into the DMA 2980 furnace assembly.The number of heaters that are turned on dependon the cooling rate desired.

The operation of the GCA is very simple. Whencooling gas is needed by the instrument, thefollowing events occur (refer to Figure 1.1 for anillustration of the numbered parts):

1. Instrument requests cooling gas.1. Heater in the GCA is turned on.2. Feed solenoid valve #1 opens.3. Vent valve #2 is closed.

2. Instrument no longer requests coolant.1. Heater in the GCA is turned off.2. Feed Solenoid valve #1 closes.3. Vent valve #2 is opened.


Figure 1.1GCA SchematicOperation

Theory of Operation


Introducing the GCA

1–8

Description ofComponents

The following illustration shows the major partsof the TA Instruments GCA. Refer to Table 1.2for a descriptions of these parts.

Figure 1.2Major Parts ofthe GCA

SolenoidTransfer Valve

Bulk Storage Feed Tube(from bulk supply)

Coolant Transfer Tube(to instrument)

Dewar


Description of Components

Table 1.2GCA Components

Item Description

50 Liter dewar The thermally-insulatedstorage vessel for liquidnitrogen.

Bulk Storage Allows the automatic andFeed Tube manual filling of the 50

liter GCA dewar from abulk storage source.

Coolant Supplies gaseous nitrogenTransfer from the GCA to theTube instrument.

Feed An automatic solenoidSolenoid valve that opens to supplyValve gaseous nitrogen to the

instrument.

Interface Cable Provides the controlsignals from the instru-ment to the GCA.

GCA Fill (not shown) An auto-Valve matic solenoid valve that

is used to refill the GCAautomatically.


Introducing the GCA

1–10

Top Sectionof GCA

The top section of the GCA contains severalitems important to the operation of the accessoryand the instrument. Figure 1.3 illustrates theparts of the top left side of the GCA. Refer toTable 1.3 for a description of the individual parts.

Figure 1.3Top Left Section ofthe GCA

Bulk StorageAutoFillConnection

PowerCable

ResetButton

ReadyLamp

LoadButton

AccessoryConnection

InstrumentConnection


Description of Components

Table 1.3Parts of the TopLeft Section of the GCA

Item Description

Instrument Connects the GCA withConnection the instrument to commu-

nicate information such asGCA tank pressure,heater regulation, etc.between the GCA and theinstrument.

Accessory Connects the GCA toConnection accessories such as the

Gas Switching Accessory.

Load Used to place the GCA inload mode. See �Updat-ing the Software� forinstructions.

Ready Lamp Glows when the GCA hasfinished its confidence testand is ready for operationwith the instrument. Ifthis lamp blinks, it signalsa fatal error during theconfidence test�call TAInstruments for service.

Reset Button Press to reset the GCAand run the confidencetest again.


Introducing the GCA

1–12

Several other parts of importance to the opera-tion of the GCA are contained on the back of thetop section as seen in the figure below. SeeTable 1.4 for a description of these parts.

Figure 1.4Back of the TopSection of the GCA

ON/OFF Switch

Bulk StorageAutoFill Connection

Bulk StorageFeed Tube

PowerCable

Fuse


Table 1.4Parts on the Backof the Top Section

Item Description

Bulk Storage Allows the GCA to beAutoFill refilled automaticallyConnection by connecting a bulk

storage tank.

ON/OFF Turns the GCA power on.Switch This switch must be on for

the GCA to supply coolantto the instrument and torefill the GCA automati-cally from the bulk liquidnitrogen storage container.

Power Cable Plugs into a source ofelectrical power to providepower for the operation ofthe GCA and its heaters.

Fuse An 8A, 125/250V normalblow fuse is located in thetop section of the GCA.If this fuses blows, youwill get no response fromthe unit when you attemptto turn it on.


Introducing the GCA

1–14


Chapter 2: Installing the GCA

Unpacking and Inspecting ........................... 2-3

Before Installation ................................ 2-3

Choosing a Location ............................. 2-5

Help Lines ................................................... 2-6

Installing the GCA....................................... 2-7

Installing the Drain Valve ................... 2-12

Updating the Software ....................... 2-14Changing the Settings................... 2-20


Installing the GCA

2–2


Unpacking and Inspecting

Unpacking andInspecting

By the time you are reading this manual, youhave already done a certain amount of unpack-ing. Continue to unpack and inspect the contentsof the GCA shipping box. Retain the shippingcontainer and packing materials until the unit hasbeen successfully installed and verified to befunctioning correctly.

If the GCA received rough handling in shipmentand signs of damage are apparent, contact thecarrier immediately for advice on how to make aclaim. Please call TA Instruments to advise usof the problem. DO NOT use or install theinstrument until an authorized representative ofTA Instruments has repaired it.

Contact your TA Instruments representative ifparts are missing.

Before Installation

There are a few items to check before you begininstalling the GCA to the instrument. Pleasecheck the following:

Read the safety precautions for handlingcryogenic materials (located in the prefix of thismanual) before installing the GCA. Weargoggles or a face shield and gloves large enoughto be removed easily whenever you handle liquidnitrogen.

!WARNING


Installing the GCA

2–4

� Check the clamp holding the GCA topsection to the dewar. The clamp is locatedbelow the sheet metal covers. The clampmust be tight for proper operation of theequipment.

� Connecting the GCA to an instrumentrequires that a specific interface cable beused. Make sure the proper cable is beingused for this installation.


Choosinga Location

Because of the sensitivity of experiments usingthe GCA, it is important to choose a locationusing the following guidelines:

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

ventilation space around the instru-ment. (Refer to the technical speci-fications in Chapter 1 for the instru-ment�s dimensions.)

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 DMA 2980.

Awayfrom. . . dusty environments.

. . . exposure to direct sunlight.

. . . direct air drafts (fans, room air ducts).

. . . poorly ventilated areas.

After you have decided on the location for yourinstrument and GCA, refer to the next severalsections to unpack and install the GCA.

Unpacking and Inspecting


Installing the GCA

2–6

Help Lines

United States of America

For Technical Assistance......... (302) 427-4070

To Order Instrumentsand Supplies ............................. (302) 427-4000

For Service Inquiries ................ (302) 427-4050

Sales ......................................... (302) 427-4000

TA Instruments has a worldwide network ofrepresentatives, please refer to Appendix B for alist of subsidiaries. To obtain more detailedinformation about how to contact your localrepresentative, call the Sales number above orsend a request by Fax to International Sales at(302) 427-4186.


Installing theGCA

Installing the GCA primarily consists of attachingthe cables and lines to the instrument and thebulk liquid nitrogen source. Use the followingbasic steps to install the GCA.

1. Position the GCA within 6 feet (1.8 meters)of the instrument.

2. Attach the coolant transfer tube to the GCAat the fitting labeled N2 Gas to Instrument/LN2 Manual Fill.

3. Remove the air cool line (if present) fromthe 90° elbow fitting on the DMA, andattach the coolant transfer tube (see thefigure below). Make sure the fittings aretight.

Figure 2.1Attaching the CoolantTransfer Tube to the DMA

Installing the GCA

DMA 2980

Cooling HoseAccessoryInlet

CoolantTransferTube

90° ElbowFitting


Installing the GCA

2–8

4. Make sure the power switch on the GCA isin the off position.

The instrument power switch should be offbefore connections are made.

5. Connect the interface cable to left side ofthe GCA at the connection marked IN-STRUMENT as shown in the figure below.

Figure 2.2Left Side ofGCA Top Section

6. Connect the other end of the interface cableto the rear of the instrument at the connec-tion marked Serial, as shown in the figure onthe next page.

t CAUTION:


PowerCable



Figure 2.3Rear of DMA

7. Attach the power cable to the back of theGCA (see Figure 2.4). Then plug the powercable into the 120 Vac power source.

8. Turn the power switch to the ON position(see Figure 2.4). When the ready lightglows, the accessory is ready to be used.

The GCA is designed to be filled automaticallyfrom a low pressure, 20 to 25 psi (140 to 175kPa), bulk storage liquid nitrogen container.

If you will not be using the autofill feature, turnto page 3-7 for manual filling instructions.

To use the auto refill capability, follow the nextseveral steps.

If your liquid nitrogen source has more than 25psi (175 kPa), then a pressure regulator mustbe added to insure no more than 25 psi (175kPa) is delivered to the GCA. Failure to limitthe pressure may result in damage to the fillsolenoid valve, cause excessive fill times,and cause the safety pressure relief valve toactivate.

SerialConnection

t CAUTION:

Installing the GCA


Installing the GCA

2–10

9. Arrange the low pressure bulk storagesource physically close enough, within 6 ft(1.8 m), to the GCA so that the autofill tubecan be easily connected between the sourceand the GCA. Likewise the GCA and theinstrument need to be in close proximity toallow connection of the control cable and the6-ft (1.80-m) coolant transfer tube.

10. Attach the bulk storage feed tube to theGCA. Use a wrench to tighten the bulkstorage autofill connector. See the figurebelow.

Figure 2.4Bulk Storage Feed TubeAttached to GCA

ON/OFF Switch

PowerCable


Bulk StorageFeed Tube


Installing the GCA

11. Attach the other end of the bulk storage feedtube assembly to the liquid feed connector onthe bulk storage container.

Figure 2.5GCA Attachedto DMA 2980


Installing the GCA

2–12

Installing the Drain Valve

Ice and frost are created during normal use ofthe Gas Cooling Accessory. The GCA catchtrough is designed to prevent water from drippingonto the floor creating a potential hazard whenthe ice and frost melt.

The drain valve may be needed to occasionallyempty water from the catch trough. To installthe condensate drain valve, use a 5/8-inchwrench on the swage nut, screw the elbow intothe fitting until it is hand tight with the valvepointing down (see the figure below).

Figure 2.6Drain Valve Installation

Catch Trough

Swage Nut

Elbow

Plastic Valve

GCA

Condensate Drain Valve


Installing the GCA

Empty the GCA catch trough periodically byopening the valve and draining the water into asuitable container, or a hose can be connected tothe valve and routed to a floor drain or largecontainer.

During manual filling operations, do not over fillthe GCA tank causing liquid nitrogen to spill intothe catch trough.

The software used to run the GCA has alreadybeen loaded at TA Instruments. However, youmay need to update that software with a newversion. Follow the instructions in the nextsection to update the GCA program.

After the GCA has been completely installed,and the software updated, if necessary, you canturn to the next chapter for the instructionsneeded to fill the accessory with liquid nitrogen.

t CAUTION:


Installing the GCA

2–14

Updating the Software

If you need to update the software with a newversion, follow these instructions to connect theGCA to the controller and to run the TA Instru-ments Accessory Loader program:

The windows appearing in this section reflectthe Thermal Solutions/Advantage software. Ifyou are using the OS/2 controller software, thewindows will appear slightly different but theprocedure is still basically the same.

1. Disconnect the RS-232 interface cable fromthe DMA (see pages 2-8 and 2-9 forlocation).

2. Connect the RS-232 interface cable fromyour GCA to your controller. (You mayneed to disconnect both ends of the RS-232cable, then reverse the ends so that theproper gender connectors match.)

You can connect the RS-232 cable from thecontroller to either the INSTRUMENT or ACCES-SORY connection on the GCA.

3. Start the TA Instruments Accessory Loaderprogram from the Start/Programs menu.The window shown in the figure on the nextpage is displayed.

4. Select the Start button to begin loading theprogram. The program will check to makesure a TA Instruments accessory is con-nected to a communications (COM) port onthe controller (see pages 2-8 to 2-9 toconnect the GCA to the controller).

NOTE:

NOTE:


Installing the GCA

The button will change to read �Pause,� toallow you to halt the loading process, ifdesired.

Figure 2.7Accessory Loader Window

Refer to Table 2.1, on the next page, for adescription of the parts of the Main window.

Start\Pause\Resume\ExitButton

StatusMessageArea

PercentCompleteArea


Installing the GCA

2–16

Table 2.1Parts of theMain Window

Part Description

Status As the program is loading,Message this area will display textArea describing the action in

progress.

Percent A status bar is filledComplete in from left to right as theArea program loads, providing a

visual method to track thepercent completion of theprocedure.

Start/ This main control buttonPause/ changes depending on theResume/ current point in theExit Button loading process. �Begin�

is used to start the loadingprocess. �Suspend� isused to halt the programand place it on hold.�Resume� is used torestart the program after itwas suspended. �Exit� isused, after the programhas completely loaded thesoftware, to end theprogram.


Installing the GCA

If no GCA is found, you can change theprogram settings, if needed, by following theinstructions found in the section entitled�Changing the Settings� on page 2-20.

If the GCA is located successfully, thefollowing message is displayed.

Figure 2.8Load Button Message

3. Locate the recessed Load button on the sideof the GCA, shown in the figure below.

Figure 2.9GCA Top LeftSection

Reset ButtonReady LampLoad Button


Installing the GCA

2–18

4. Using a blunt-end tool, such as a pen tip,depress the Load button. The Ready lampshould go off to indicate that you havesuccessfully placed the accessory into the�load� state.

5. Click the Resume button on the AccessoryLoader window.

You can halt and cancel the download processby selecting the Cancel button.

The window shown below is displayed.

Figure 2.10Select Loader File Window

6. Select the proper HEX file (Gca.hex), thenselect OK.

The program will read the file and send theappropriate information to the accessory.

NOTE:


Installing the GCA

The Download Status area will reflect thestatus of the procedure. Then the messageshown in the figure below will be displayed.

You can pause and resume the operation at anytime during the downloading procedure usingthe appropriate button. You can also end theprocedure by closing the window.

Figure 2.11Reset Accessory Message

7. After the software has been successfullyloaded, press the Reset button on the side ofthe GCA top section, see Figure 2.9 for itslocation. This will retrieve the calibrationinformation used for the GCA and reset theaccessory. (You may need to turn thepower to the GCA off, and then on again, ifthe Reset is not successful.)

The status message area on the Mainwindow will display �Software DownloadSuccessful!�

8. Select the Exit button.

NOTE:


Installing the GCA

2–20

Changing the Settings

The Gas Cooling Accessory has been set up torun using the default settings used in the Acces-sory Loader program. Therefore, we recom-mend that you keep the settings as shown in thefigure below.

To access the Communications Settingswindow, select the Settings button on theAccessory Loader window.

Figure 2.12Communications SettingsWindow

The table on the following page provides a briefexplanation of the settings shown.


Installing the GCA

Table 2.2CommunicationsSettings

Setting Description

Port The communications portNumber used to connect an

accessory to your control-ler. Select either COM 1or COM 2 depending uponyour system setup.Default setting = COM1

Data Bits Number of bits percharacter.Default setting = 8.

Handshaking The required sequence ofsignals for communicationbetween the GCA and thecontroller.Default setting = DTRControl.

Baud Rate The transmission rate fordata signals.Default setting = 9600

Stop Bits The last element of acharacter that signals theend of the character.Default setting = 1.

(table continued)


Installing the GCA

2–22

Table 2.2Accessory LoaderSettings (cont'd)

Setting Description

Parity A bit, transmitted beforethe stop bit, that is used tocheck for errors incommunications.Default setting = None.


Chapter 3:Filling and Using the GCA

Introduction................................................. 3-3

Autofilling the GCA ................................... 3-4

Autofilling the GCA forthe First Time ....................................... 3-5

Refilling the GCA Afteran Experiment ...................................... 3-6

Manually Filling the GCA ......................... 3-7

Operating Your GCAwith the DMA ........................................... 3-11

Basic Operation .................................. 3-12


Filling the GCA

3–2


IntroductionThe GCA tank must be filled with liquid nitro-gen before it can be used for cooling experi-ments with the DMA 2980. There are twomethods you can use to fill the GCA, dependingon your laboratory setup:

� If you have the available space and are ableto keep a bulk storage reservoir near theinstrument, you can use the autofill feature.This allows you to automatically refill theGCA with liquid nitrogen from your bulkstorage reservoir, when the GCA is notactively cooling.

� If you must take the GCA to the bulkstorage reservoir for refilling, you will needto use the manual method to fill the GCAtank with liquid nitrogen.

Refer to the appropriate section in this chapterfor the method of filling desired.

Read the safety precautions for handlingcryogenic materials (located in the prefix ofthis manual) before filling the GCA. Weargoggles or a face shield and gloves largeenough to be removed easily whenever youhandle liquid nitrogen.

This chapter also includes guidelines on when touse the GCA with your DMA instrument andbasic operation of the GCA.

!WARNING


Filling the GCA

3–4

Autofilling the GCAAutofilling refers to the automatic refilling ofthe GCA from the bulk storage tank, providing areadily available cooling source for experiments.This section tells you how to set up the GCAand the connected instrument to allowautofilling. See page 3-7 for information onmanually filling the GCA.

The autofill feature ensures that a ready supplyof liquid nitrogen is available for subambientexperiments. It reduces the effort and timeinvolved with refilling the GCA manually.Following is a list of the features associated withautofilling:

� It allows the bulk storage supply of liquidnitrogen to automatically refill the GCA ondemand from the instrument.

� Typical fill times for automatic refilling willbe approximately 20 minutes, if the tank iscompletely empty. The time for automaticrefilling is much shorter (about 10 minutes),if there is any liquid nitrogen left in thetank.

� Any autofill cycle will automatically stop ifa test is started on the instrument. Autofillcan only occur when a method is not inprogress.

For information on running subambient experi-ments refer to the appropriate chapter in theDMA 2980 operators manual.


Autofilling the GCAfor the First Time

The GCA must be filled before cooling experi-ments can be performed on the DMA 2980.When you have completely installed the GCA asdirected in Chapter 2, and are ready to use theautofill system, follow these steps:

1. Open the liquid feed valve on the lowpressure [25 psi (175 kPa) maximum] bulkstorage container. Do not close this valveagain until the bulk storage container isempty, or wait until 15 minutes after the fillsequence has been completed.

2. Select Control/GCA fill on the ThermalSolutions DMA Instrument Control MainMenu. The GCA will be filled automati-cally. (See the Thermal Solutions UserReference Guide for further information.)

The autofill will shut off when the dewar is full,the bulk storage tank is empty, or the GCA tankpressure is below one psi for more than oneminute.

Cold gas will escape from the GCA vent valve andmay escape from the relief valve under certainfilling conditions. The fill process normally takesabout 20 minutes.

Frost will build up on the tubing and parts of theGCA and storage tank while the liquid nitrogen isbeing transferred. The insulation on the bulkstorage feed tube will become stiff and brittleduring the autofill process. Allow the tube toreturn to room temperature before attempting tomove or bend the tube.

Autofilling the GCA

NOTE:

NOTE:


Filling the GCA

3–6

Refilling the GCAAfter an Experiment

To automatically refill the GCA with liquidnitrogen after an experiment is completed, yousimply set the method-end conditions to selectautofilling at the end of a method.


Manually Fillingthe GCA

The GCA is designed so that it can be filledmanually as well as automatically. The auto-matic filling procedure has been discussedpreviously. The instructions found in thissection explain the method used to manually fillthe GCA. The manual fill mode should only beused when a bulk storage reservoir cannot beplaced close to the GCA.

Follow the directions below to fill the GCAmanually. Refer to Figures 3.1 and 3.2 for thelocation of the items called out in the procedure.

Adapters, which are not supplied, may berequired.

1. Make sure that the bulk storage source thatwill be used for filling the GCA is a lowpressure [25 psi (175 kPa) maximum]container. Use a regulator if the pressure isgreater than 25 psi (175 kPa).

2. Turn off the POWER switch on the GCAand disconnect the power cable (cableshown on Figure 3.1, page 3-8).

3. Disconnect the controller interface cablefrom the INSTRUMENT connection(connection shown on Figure 3.1, page 3-8).

Manually Filling the GCA

NOTE:


Filling the GCA

3–8

Figure 3.1Left Side of GCA

4. Disconnect the coolant transfer tube fromthe GCA. This is the hose, shown in thefigure below, which runs from the GCA tothe instrument.

Figure 3.2Manually Filling the GCA


PowerCable


Remove this CoolantTransfer Tube formanual filling. TheBulk Storage FeedTube will be usedinstead.

“N2 Gas to Instrument/

LN2 Manual Fill” Fitting


5. Wheel the GCA to your bulk storage reser-voir location.

6. Connect the bulk storage feed tube from thebulk storage reservoir to the N2

Gas toInstrument/ LN2 Manual Fill fitting on theGCA (shown in Figure 3.2). Tighten allfittings.

7. Open the valve on the bulk storage reservoirand begin filling the GCA.

Cold gas will escape from the GCA vent valve andmay escape from the relief valve under certainfilling conditions. The fill process normally takesabout 20 minutes.

Frost will build up on the tubing and parts of theGCA and storage tank while the liquid nitrogen isbeing transferred. The insulation on the bulkstorage feed tube will become stiff and brittleduring the autofill process. Allow the tube toreturn to room temperature before attempting tomove or bend the tube.

8. Fill the GCA with liquid nitrogen until itweighs 175 lbs. The tank will be aboutthree-quarters full.

If the GCA is overfilled, the excess liquid nitrogenwill automatically be boiled off when the GCA isconnected to the instrument.

9. Close the valve on the bulk storage reser-voir. Allow time for the liquid within thetransfer tube to evaporate (approximately 15minutes).

NOTE:

Manually Filling the GCA

NOTE:

NOTE:


Filling the GCA

3–10

10. Disconnect the feed tube from the GCA.

Use care when wheeling the full GCA to anotherlocation. The agitation will cause increasedventing of the liquid nitrogen, and it may tip overeasily.

11. Wheel the GCA back to the instrument andreconnect the coolant transfer tube from theinstrument to the GCA.

12. Reconnect the interface cable to the IN-STRUMENT connection and plug in thepower cord. (See Figure 3.1 on page 3-8.)

13. Turn on the POWER switch. The GCA isready to operate.

t CAUTION:


Operating Your GCAwith the DMA

During experiments the DMA 2980 monitors theneed for coolant and automatically communi-cates the need for the power to the GCA heaters.This enables the variation of the coolant flow,as needed, to obtain the set temperature requiredin your experiments. The operation of the DMA2980 is controlled by both its keypad and theThermal Solutions Instrument Control software.

The Gas Cooling Accessory is generally usedwith the TA Instruments DMA 2980 in thefollowing situations:

� When a subambient heating segment is usedthat is slower than the intrinsic heating rateof the furnace (which is approximately 2-3°C/min.).

� When any cooling segment is used in amethod.

� When an isothermal segment is used at atemperature below 100°C.

Even if you are not using the GCA for cooling,it will still be active so that the normal boil-offof the gas from the tank will purge the furnaceand sample with dry nitrogen.

For more information on method segments, seethe Thermal Solutions User Reference Guide.

Operating Your GCA with the DMA


Filling the GCA

3–12

Basic Operation

Follow these basic steps to use the GCA withthe DMA 2980.

1. Connect and fill the GCA as directed in thismanual.

2. Mount the sample in the DMA clamp. Seethe DMA 2980 Operator�s Manual fordetails.

3. Make sure the DMA power, DMA heater,and GCA power switches are switched on.

4. Use the Thermal Solutions software to setup and start your experiment. See theThermal Solutions User Reference Guide forinformation.

TA INSTRUMENTS GAS COOLING ACCESSORY A–1

Parts Ordering Information

Appendix A: Parts ListsService should only be performed by quali-fied service personnel. Please contact TAInstruments at one of the offices listed in Appen-dix B for service or replacement parts. Toensure that you receive the correct part for yourunit, be sure to include the part number, descrip-tion, instrument type, model number, and serialnumber.

Table A.1GCA Parts List

Part No. Description

264064.001 Gasket, Neoprene Tank,3" Dia., GCA

991426.001 GCA Operator's Manual

991075.902 Tank, GCA Replacement

205225.037 Fuse

991441.001 Tube, Instrument Feed

991442.001 Tube, Tank Fill, GCA

270712.001 Cable, RS232

890035.901 Power Cord


Appendix A

A–2

Electrical Safety(repeated from Safety section)

High voltages (120 Vac) are present in thisinstrument, only qualified service personnelshould remove covers and make repairs.

The power at the instrument must be turnedoff, and the interface cable and power cordmust be removed before any service or repairwork is started.

Hazardous voltage is present inside the GCA.Do not remove the clamp securing the cap tothe dewar. There are no user-serviceable partsinside the GCA. Call TA Instruments forservice.

!WARNING

!WARNING

TA INSTRUMENTS GAS COOLING ACCESSORY B–1

Appendix B: Ordering Information

TA 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 assistance with 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: 0-11-44-1372-360363Fax: 0-11-44-1372-360135

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

TA Instruments BelgiumA Division of Waters s.a./n.v.Raketstraat 60B-1130 BrusselsTelephone 32-2- 706 00 80Fax 32-2- 706 00 81

Appendix B

B–2 TA INSTRUMENTS GAS COOLING ACCESSORY

TA Instruments The NetherlandsA Division of Waters Chromatography B.V.Florijnstraat 194879 AH Etten-LeurTelephone 31-76- 508 72 70Fax 31-76- 508 72 80

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-YvelinesCedex, FranceTelephone: 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


Index

I–1

Index

Symbols

50 Liter dewar 1-9

A

Accessory Loader program 2-14 to2-22

changing settings 2-20exiting 2-19starting downloading 2-14

Autofill feature 2-9

autofilling 3-4 to 3-7fill times 3-4for the first time 3-5 to 3-6shut off 3-5

B

Baud Rate 2-21

bulk storage feed tube 1-9, 3-9

bulk storage reservoir 3-7pressure 3-7

bulk storage tank 1-3, 1-5, 2-9location for autofill 2-10

burnsfrom liquid nitrogen xi

C

cableinterface 2-4, 2-8

installation 2-8power 1-13, 2-9RS-232 2-14

capacitycooling 1-4liquid nitrogen tank 1-4

catch trough 2-12emptying 2-13

clampcheck of 2-4

componentsdescription 1-8list 1-9

condensation xiv, 2-12

connectionaccessory 1-11bulk storage fill 1-13GCA 2-8instrument 1-11, 2-8

Coolant Transfer Tube 1-9

cooling experiments 3-3

cryogenic materialshandling 3-3safe handling x

Index

I–2 TA INSTRUMENTS GAS COOLING ACCESSORY

D

damagesigns of 2-3

Data Bits 2-21

description 1-3

dewar 3-5

DMA 3-11rear 2-9

drain valvecondensate 2-12installation 2-12

E

electrical safety xiv, A-2

environment 2-5

F

fileHEX 2-20

fill modes 1-5

filling the GCA 2-9

frost 3-5

G

GCAenvironment of 2-5Load button 2-19manual filling 3-7 to 3-11operation 3-11parts list A-1refilling 3-6resetting 2-21

GCA Fill Valve 1-9

GCA shipping box 2-3

GCA tankautofilling 3-3filling 3-3manual filling 3-3

H

Handshaking 2-21

Help Lines 2-6

HEX file 2-18

I

inspecting 2-3

installationchecks before 2-3coolant transfer tube 2-7drain valve 2-12interface cable 2-8power cable 2-9procedures 2-7 to 2-9


Index

I–3

Interface Cable 1-9

interface cableconnection 2-8

L

LEDs 2-17

liquid nitrogen 3-3absorption of oxygen xibulk storage tank 1-5bulk tank 2-9handling x, 3-3pressure build-up xiitank pressure 2-9

Load button 1-11

M

manual filling 3-7

N

Notes, Cautions and Warnings vi

O

ON/OFF switch 1-13

operation 3-11schematic 1-7theory 1-6

oxygenabsorption by liquid nitrogen xi

P

Parity 2-22

partsreplacement A-1top section 1-11

parts listGCA A-1

phone numbers 2-6

Port 2-14, 2-21

power requirements 1-4

power cable 1-13installation 2-9

power requirements 2-5

pressurebulk storage reservoir 3-7liquid nitrogen xii

pressure relief 1-4

R

Ready Lamp 1-11

refillingautomatically 3-6

after experiment 3-6

refilling tank 2-9

Index

I–4 TA INSTRUMENTS GAS COOLING ACCESSORY

Reset Button 1-11

resetting 2-19

RS-232 cable 2-14

S

Safety viii to xivelectrical xiv, A-2handling liquid nitrogen x, x to xilabels viii

size 1-4

softwareupdating 2-14

Solenoid Transfer Valve 1-9, 2-7

specifications 1-4

Stop Bits 2-21

subambient experiments 3-4

T

Table of Contents iii to vi

tankbulk storage 1-5

theory of operation 1-6

Thermal Solutions 3-5

timefor autofilling 3-4

top section 1-10

tubebulk storage feed 3-9coolant transfer 2-10

installation 2-7feed 1-5, 2-10fill 1-5

U

unpacking 2-3

W

water condensation xivhandling xiv

weight 1-4

Documents

Gas Cooling Accessory - TKE€¦ · Cooling Accessory for your protection: Symbol Explanation Indicates the presence of a hazard related to the area or part indicated. Please heed