Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 305
4. Measure the FID flows with an independent
measurement device such as a bubble meter
or electronic flow meter. Use the FID flow
adapter (part number 19301-60660). It is
very important to measure the actual FID
flow rates and not rely on the front panel
reading for flows. This is because all of the
detector flows are controlled in the EPC
module by controlling a calibrated pressure
against a known restriction built into the
EPC module.
If there are any restrictions in the H
2
/
Makeup gas flow path or any leaks in the
detector gang fitting or the column fitting at
the base of the FID, the actual flows will be
wrong. Measurements from a soap film flow
meter will be affected by atmospheric pres-
sure - the FID EPC module is calibrated at
Normal Temperature and Pressure (25°C/
1 atm). For accurate measurements use a
true mass flow meter like the Agilent Flow
Tracker 1000.
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