Routine Maintenance: Detectors
Maintaining a flame ionization detector (FID)
Released: March 2004 6850 Series II GC User Information page 192 of 256
Table 37. Jets for the FID
To change a jet, you must first remove the FID collector assembly. See
“Removing the collector” on page 195.
This procedure is divided into three parts: removing and inspecting the jet,
cleaning the jet (optional), and installing the jet.
Tools
• T-20 Torx screwdriver
• 1/4-inch nut driver
Procedure
1. Load the SERVICE method, or reset the detector and oven temperatures to
OFF, or turn the main power switch off. Allow the detector and oven to
cool to room temperature.
2. Turn the inlet and detector gas pressures off at the sources.
3. When the oven is cool, remove the column and plug the detector to
column fitting.
4. Confirm that the electrometer is turned off. If you are not sure, turn the GC
main power off.
Warning High temperature.
5. Wear heat resistant gloves, if the detector is hot.
6. Remove the three screws holding the collector assembly in place. Lift off
the assembly. The insulator can remain in the collector bottom.
Jet type Part no. Jet tip id
Capillary 19244-80560 0.29 mm
(0.011-inch)
Packed 18710-20119 0.47 mm
(0.018 inch)
Packed wide-bore
(use with high-bleed applications)
18789-80070 0.030 inch
High-temperature
(use with simulated distillation)
19244-80620 0.47 mm
(0.018-inch)
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