Troubleshooting and Error Messages
User Information 179
Pressure Readings
GC goes not ready during a run
When using the AUX EPC to pressurize the vial it is normal for
the GC to go not ready for 10 to 20 seconds during the sample
extraction. The tubing from the AUX EPC module to the shutoff
valve is 1/16-inch OD tubing. The tubing from the shutoff valve
is about 6 inches of 1/8-inch OD copper tubing. If the 1/8-inch
tubing is longer, it can cause a problem.
GC pressure reading does not match Headspace Sampler pressure
reading
Pressure readings at the Headspace Sampler vary slightly from
GC pressure readings. The instruments use a different type of
sensor and the two sensors are calibrated using a different
process. If there are severe differences in the pressure check for
leaks and restrictions. See Leak Test on page 148.
Pressures are below normal operating pressures
If pressures are below normal operating pressures, check the
following:
• Check the pressure of the gas source (tank, generator, or
manifold). For example, the tank may be low on pressure.
• Make sure the shutoff valves on the back of the Headspace
Sampler are on.
• Check for leaks between the source and the bulkhead fittings
of the GC (EPC) or Headspace Sampler (MPC).
• Check for large restrictions or leaks in the Headspace
Sampler. See Leak Test on page 148.
medium_standard.book Page 179 Tuesday, February 17, 2004 10:14 AM
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