10. With valves 1-4 closed, open both cylinder valves and regulate both carriers to
approximately 10 psig.
11. Open V-2 and V-3 simultaneously; then turn both cylinder valves off and let the
carrier gases bleed through the line to the GC until all gauges read 0 psig.
12. Repeat Step 8 and Step 9 twice to purge the line to the GC.
13. Leak check all the fittings carefully.
14. Let the GC run overnight before calibrating.
2.5 Changing the thermistors
Use this procedure to change the helium thermistors to hydrogen comparable
thermistors.
WARNING
EXPLOSION HAZARD
Failure to observe this warning may cause death or serious injury to personnel.
Hydrogen is potentially explosive. Use extreme caution when using hydrogen as the
gas chromatograph's carrier gas.
To prevent ignition of hazardous atmospheres, disconnect from supply circuit before
opening the enclosure. Keep tightly closed when circuits are alive. For division
installations using a conduit, a sealing device must be connected within 18 in. (460
mm).
Procedure
1. Turn off power to the gas chromatograph.
Installation Retrofit Instructions
September 2019 SK-07781
14 Emerson.com/Rosemount
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