11 Maintaining the FID
To Check the FID Leakage Current
Maintaining Your GC 197
To Check the FID Leakage Current
1 Load the analytical method.
• Make sure flows are acceptable for ignition.
• Heat the detector to operating temperature or 300 °C.
2 Perform a Leakage Current Test from the touchscreen: Diagnostics > Diagnostics Tests >
Detectors, select FID# Leakage Current Tests. Read the Test Details screen then press
Start Test.
3 Turn off the FID flame.
4 Show the detector output signal in Status. On the GC touchscreen go to Home > Status
listing > +Add. Select Detector’s Output from the drop-down list, then touch Add.
5 Verify that the output is stable and < 1.0 pA.
If the output is unstable or > 1.0 pA, turn off the GC and check for proper assembly of the
upper FID parts and contamination. If this contamination is confined to the detector,
bakeout the FID. See “To Bakeout the FID” on page 200.
6 Turn on the flame.
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