Replace Detector Base Weldment - HP 5890 SERIES II Service Manual

Replace Detector Base Weldment

HAZARDOUS VOLTAGES ARE PRESENT IN THE INSTRUMENT WHEN THE
`
POWER CORD IS CONNECTED. AVOID A POTENTIALLY DANGEROUS SHOCK
HAZARD BY DISCONNECTING THE POWER CORD BEFORE WORKING ON THE
INSTRUMENT.
FLAME PHOTOMETRIC (FPD) DETECTORS USE HYDROGEN GAS AS FUEL. BE
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SURE ALL HYDROGEN GAS IS TURNED OFF AT ITS SOURCE BEFORE
REPLACING ANY FLOW COMPONENTS.
1. Set the main power line switch to the off
position.
2. Disconnect the power cable from its receptacle.
3. Turn off the hydrogen, air (or oxygen), and aux-
iliary nitrogen supplies to the detector (at the
flow control panel).
4. Allow time for the heated zones to cool.
5. Remove the thumb- screw holding the detector
cover to the top of the HP 5890.
6. Facing the instrument, rotate the detector cover
to your right until the tab on the bottom left
edge of the cover comes free.
7. Raise the back of the cover and slide it towards
the rear of the instrument.
8. Lift the detector top cover to expose the FPD detector weldment.
9. Release the extension spring securing the PMT assembly to its support bracket.
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