Replacing/Repairing A Flow Manifold Block - HP 5890 SERIES II Service Manual

Replacing/Repairing a Flow Manifold Block

Each detector requires a flow manifold block for gas control. There are various types of blocks, de-
pending upon the particular detector, and upon whether or not capillary makeup gas is also to be
supplied to the detector.
HAZARDOUS VOLTAGES ARE PRESENT IN
`
THE INSTRUMENT WHEN THE POWER CORD
IS CONNECTED.
DANGEROUS
DISCONNECTING
BEFORE WORKING ON THE INSTRUMENT.
FLAME IONIZATION (FID) AND NITROGEN
`
PHOSPHOROUS (NPD) DETECTORS USE
HYDROGEN GAS AS FUEL.
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. Allow time for the oven and heated zones to cool.
4. When the heated zones are cool, turn off all gas
supplies.
6. Remove the two screws securing the left
side panel along its bottom edge.
7. Slide the left side panel towards the rear
of the instrument and lift.
8. Disconnect all plumbing from the block.
When removing the FID or FPD ignitor
connectors, pull on the plug not on its wires.
Pulling on the wires may cause damage.
9. On an FID or FPD block, disconnect the ignitor electrical
connections..
10. Remove the outlet fitting plate from the side of
the flow block by removing the screw securing it
to the block.
11. Disconnect the detector supply gas tubes.
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AVOID A POTENTIALLY
SHOCK HAZARD
THE POWER CORD
BE SURE ALL
SVC 3- 25
BY
AUX
AIR
H
RED O VISIBLE
OFF ON
AIR
IGNITOR
CONNECTORS
H
2
OUTLET
FITTING
PLATE
2