Clean/Replace Fpd Filter - HP 5890 SERIES II Service Manual

Clean/Replace FPD Filter

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
`
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 gas supply to the detector by means of
the manifold on/off valves.
4. Allow time for the detector module 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.
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