Remove/Replace Electronic Pressure Control (Epc) Components - HP 5890 SERIES II Service Manual

Remove/Replace Electronic Pressure Control (EPC) Components

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.
5. Remove the two screws securing the left
side panel along its bottom edge.
6. Slide the left side panel towards the rear
of the instrument and lift.
7. Disconnect the tubing nut from the PCOC pro-
portional control valve.
8. Remove the plastic M8 nut securing the septum
purge outlet from the inlet to the septum purge
regulator.
9. Remove the two 7- mm nuts securing the EPC
flow control bracket to the front of the instru-
ment.
10. Remove any hardware attached to the PCOC
purge vent.
11. Loosen the two screws securing the proportion-
al control valve to the EPC flow control bracket.
12. Carefully slide the proportional control valve out
of the EPC flow control bracket to provide ac-
cess to the screw securing the bracket to the
instrument flow carrier.
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AVOID A POTENTIALLY
SHOCK HAZARD
THE POWER CORD
BE SURE ALL
SVC 3- 11
BY
PROPORTIONAL
CONTROL VALVE
SEPTUM
PURGE
REGULATOR
RED O VISIBLE
OFF ON
MOUNTING
NUTS
PCOC
PURGE
VENT