5-24 | IPS-4 Dual Bench (UV / IR) Analyzer
3. Power down the analyzer:
General Purpose (GP) applications:
Open the Electronics Enclosure door and disconnect AC power from
the analyzer and its temperature-control zone circuitry by opening the
Main AC Power, DC Power, Bench Heater, and Oven Heater (if used)
fuses. Refer to the Fuse Legend at the back of the Electronics Enclo-
sure for the locations of these fuses.
Purged Analyzers (Hazardous Locations):
Open the explosion-proof power-disconnect switch to disconnect
power from the analyzer and its temperature zone circuitry. If heated
Sample and Vent Lines are used, disconnect power to them. Open the
Electronics Enclosure.
The Infrared Source runs at an elevated temperature. Allow sufficient
time for the Infrared Source Assembly to cool before handling.
4. GP Analyzers Only:
Turn off the Instrument Air supply to the analyzer and then close the
Aspirator Air valve.
Purged Analyzers:
The Instrument Air supply must always remain on for the Purge By-
pass Switch to operate properly.
5. Disconnect the DC Power Cable circular connector (from the Lamp
Housing) and the 15-pin Ribbon Cable from the underside of the IR
Source Assembly (see Figure 5-1 for location).
6. Loosen the locking clamp on the circular mount and carefully remove
the IR Source Assembly. Remove the Optical Bench cover.
7. Disconnect the wires at TB1 located on the Interface board.
Remove the two screws holding the Infrared Source Assembly in
place, and slide the assembly from the Optical Bench.
8. Insert the new assembly into the optical bench. Coat the three contact
faces with a thin coat of heat-sink compound.
Insert the two screws removed earlier and attach the wires to TB1
Pins 3 (red) and 4 (black).
9. Replace the Optical Bench cover. Slide the Optical Bench back onto its
mounting stud and tighten the locking clamp.
10. GP Analyzers Only:
Turn on the Instrument Air supply to the analyzer and open the Aspi-
rator Air valve.
!
WARNING
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