2.5.1 Check the gas chromatograph (GC) for leaks
Prerequisites
Leak checking carrier and calibration gas lines requires power and a personal computer
(PC) connected to the GC.
Note
Refer to the analyzer's drawing documentation package that shipped with the GC for leak
checking and identifying vents.
Emerson tested the GC and fittings for leaks at the factory prior to shipment.
Procedure
1. Plug the measure vent (labeled MV) vent line if it is open.
Leave the SV or sample vent line open or unplugged.
2. Slowly pressurize each line in turn; then block-in the line, making sure the pressure
holds.
For example, the carrier gas line should be slowly brought up to 100 psig (689.5
kPa) ± two percent with the dual-stage regulator at the carrier gas cylinder, and the
actuation pressure should be 100 psig (689.5 kPa) maximum.
3. After two minutes, shut the carrier gas bottle valve and observe the high side
regulator gauge on the carrier gas bottle.
a. The gauge should not bleed down more than 100 psig in ten minutes.
b. If helium is lost at a faster rate, leaks are usually found between the carrier
gas bottle and the analyzer. Check and tighten all connections, as well as the
dual-stage regulator.
4. When the leak check is complete, reopen the helium bottle valve. Remove the plug
from the MV line.
5. Shut the metering valve below the rotameter on the front of the flow panel.
Leave the metering valve shhut for now; you will reopen it later during initial
purging and the analyzer's first calibration.
6. Repeat the procedure with sample gas and stream gas.
Note
Do not use a liquid leak detector, such as Snoop
®
, on the valves or components in
the oven.
Note
Refer to the Flow Configuration schematic in the documentation packet that
shipped with the GC for detailed instructions on plugging the flame ionization
detector (FID) and flame photometric detector (FPD) vents..
Quick Start Guide Installation and start-up
00825-0100-3770 July 2020
Rosemount 700XA 47
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