Remove/Replace Fpd Heater And Sensor Cartridges - HP 5890 SERIES II Service Manual

` Remove/Replace FPD Heater and Sensor Cartridges

PERFORM THE PROCEDURE FOR DISCONNECTING/CONNECTING HEATER
`
AND TEMPERATURE SENSOR WIRING ON MAIN PCB BEFORE PERFORMING
THIS PROCEDURE.
FLAME PHOTOMETRIC (FPD) DETECTORS USE HYDROGEN GAS AS FUEL. BE
`
SURE ALL HYDROGEN GAS IS TURNED OFF AT ITS SOURCE BEFORE
REPLACING ANY FLOW COMPONENTS.
1. Allow time for the heated zones to cool.
2. Remove the thumb- screw holding the detector
cover to the top of the HP 5890.
3. Facing the instrument, rotate the detector cover
to your right until the tab on the bottom left
edge of the cover comes free.
4. Raise the back of the cover and slide it towards
the rear of the instrument.
5. Lift the detector top cover to expose the FPD
detector weldment.
6. Release the extension spring securing the PMT
assembly to its support bracket.
7. Remove the photomultiplier tube (PMT) assem-
bly and sulphur filter from the detector assem-
bly and set it aside.
8. Remove the drip tube from the exhaust tube at the top of the detector.
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EXHAUST TUBE
SULPHUR FILTER
(CHIMNEY AND BRACKETRY
REMOVED FOR CLARITY)
SVC 6- 34
PMT ASSEMBLY