Detectors
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 172
Flame photometric detector
Entire detector
1. Turn off power to the gas chromatograph
and disconnect the main power cord. Remove
the detector cover, the right side cover, the
RFI cover, and the top rear panel.
Caution
Always turn the main power off before
replacing the entire detector assembly.
2. Allow time for heated zones to cool to safe
temperatures.
3. Turn off all gas flows at the source.
4. Inside the oven, remove the column to the
FPD.
Caution
To avoid damaging the printed circuit board
electronics, use a grounded wrist strap (part
no. 9300-1408) and connect it to a bare
metal surface of the GC.
5. Trace the wires from the heater/sensor
cables to their connections on the GC. Note
these locations, then remove the heater/
sensor connectors from the GC. If the actua-
tor solenoid bracket is to be removed,
remove the two mounting screws, disconnect
the connector from the main board, and
remove the bracket.
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