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Installing an Auxiliary Pressure

Agilent 6850 GCs

Accessory G3349B

Control Module

This kit contains:

The module is factory-assembled. Do not disassemble it during installation.

Description

Quantity

Cable tie .062-.625 diameter

Hex nut w/lockwasher

Disposable wrist strap

Minifold label

Restrictor kit

•

FID air restrictor (brown)

•

Blue dot restrictor

•

O-rings (6 pk)

•

Tube zero restrictor

•

External H

flow limiter

•

External Flow Restrictor Install Guide

Aux. press. control module assembly (with covers)

Back panel replacement for the GC

6850 GC user information CD

ChemStation software CD

Installation sheet (this document)

Summary of Contents for 6850 GCs

Page 1: ...eter 2 Hex nut w lockwasher 1 Disposable wrist strap 1 Minifold label 1 Restrictor kit 1 FID air restrictor brown 3 Blue dot restrictor 3 O rings 6 pk 1 Tube zero restrictor 3 External H2 flow limiter 2 External Flow Restrictor Install Guide 1 Aux press control module assembly with covers 1 Back panel replacement for the GC 1 6850 GC user information CD 1 ChemStation software CD 1 Installation she...

Page 2: ...2 Installing an Auxiliary Pressure Control Module Parts identification Parts identification Aux pressure assembly Minifold label Hex nut w lockwasher control module ...

Page 3: ...uired tools 3 Required tools Torx T 20 screwdriver Needle nose pliers Overview Caution Before starting review the safety information listed at the end of this document 1 Disconnect the GC 2 Install the new module 3 Restore the GC to operating condition ...

Page 4: ... replacing the module turn off the hydrogen gas at the source 1 Turn off the GC and unplug the power cord Allow time for all heated zones to cool 2 Disconnect all cables from the GC 3 Turn all gases off at their sources Disconnect the carrier and detector gas tubing from the back panel of the instrument Disconnect gas supply tubing from these fittings ...

Page 5: ...om the GC If you have a Series II GC save this panel Otherwise set this panel aside because you will no longer use it A new panel comes with the kit Install the new module Caution Always hold the module by its support bracket to avoid damaging board components 1 Change one or more auxiliary channel frits if needed See Changing the flow restrictors optional on page 8 Remove ...

Page 6: ...nose pliers to remove the knockouts for the ribbon cable and power cable slots 3 Remove the tape from around the new control module and thread the ribbon cable through the slot in the back panel 4 Attach the ribbon cable to the pneumatics control board at P9 High voltage power Low voltage power Ribbon cable slot Ribbon cable connector ...

Page 7: ...th a cable tie 6 Attach the control module to the back panel by hooking the tabs on the module just inside the ribbon cable slot Position it so you can insert the threaded stud through the hole in the panel On the inside use the hex nut with lockwasher to hold the stud in place 7 Install the back panel Gas tubing Cable tie Control module Nut holding stud in place ...

Page 8: ...assuming there is no significant resistance downstream of the frits If the Zero resistance frit is installed the user must provide flow resistance downstream and generate the pressure flow relationships WARNING When hydrogen is used dangerously high flows are possible if insufficient flow resistance is provided downstream of the supply tube Always use either the High blue dot or Medium red dot fri...

Page 9: ...e 1 Pressure requirements for AUX EPC flow restrictors with air nitrogen or helium 19234 60660 blue dot 19231 60770 red dot 19231 60610 brown dot 10 0 80 20 30 40 50 60 70 Minimum source pressure psig 0 1 100 0 1000 0 1 0 10 0 Gas Flow in mL min Ambient conditions 25 C 14 7 psia ...

Page 10: ...le Figure 2 Pressure requirements for AUX EPC flow restrictors with hydrogen 19234 60660 blue dot 19231 60770 red dot 19231 60610 brown dot 10 0 80 20 30 40 50 60 70 0 1 100 0 1000 0 1 0 10 0 Ambient conditions 25 C 14 7 psia Gas Flow in mL min Minimum source pressure psig ...

Page 11: ...w that holds the block to the pneumatics module Pull the block free of the module and rotate it so that the frits are on top 3 Pull the frit to be changed out of the block Also remove the O ring that seals it 4 Place an O ring on the new frit Place the O ring frit combination in the block 5 Reconnect the block to the pneumatics module Tighten the screw firmly Gang fitting block Aux 5 Aux 4 Aux 3 A...

Page 12: ...n appears An actual flow value appears when gases are off or not connected This is not an error After the gases are connected and the detector is operational the actual flow values are equal to the setpoint values If the screen reads Aux not installed recheck your cable connections 4 Enter 0 in each Aux field 3 4 and 5 to zero the pressure sensors 5 Connect the source gas lines to the module 6 Res...

Page 13: ...Installing an Auxiliary Pressure Control Module Restore the GC to operating condition 13 ...

Page 14: ...irements In the manual A warning calls attention to a condition or possible situation that could A caution calls attention to a condition or possible situation that could On the instrument all phases of operation service and repair of this instrument Failure to the intended use of the instrument Agilent Technologies assumes no cause injury to the user damage or destroy the product or the user s wo...

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