Routine Maintenance: Detectors
Maintaining a flame ionization detector (FID)
Released: March 2004 6850 Series II GC User Information page 194 of 256
10. Insert the jet and tighten with the nut driver until it is snug. Re-install the
collector assembly.
11. Install the column and restore normal operating conditions.
Cleaning the jet
It is often more convenient to replace dirty jets with new ones than to clean
them, especially jets that have been badly contaminated. See “Removing,
inspecting, and replacing the jet” on page 191 for more information.
Tools
• Small ultrasonic cleaning bath
• Flame detector cleaning kit (part no. 9301–0985)
Procedure
1. Remove the jet from the detector. See “Removing, inspecting, and
replacing the jet” on page 191.
2. Run a cleaning wire through the top of the jet. Run it back and forth a few
times until it moves smoothly. Be careful not to scratch the jet.
3. Aqueous cleaning procedure:
a. Fill the ultrasonic cleaning bath with aqueous detergent and place the
jet in the bath. Clean for 5 minutes.
b. Use a jet reamer to clean the inside of the jet.
c. Ultrasonically clean again for 5 minutes.
Caution From this point on, handle the parts only with forceps or tweezers!
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