5-18 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Source Lamp Replacement
“P/N “ refers to Part Number.
To replace Source Lamps (Figure 5-2):
Hazardous Locations
Before proceeding, test the area around the analyzer for flammable
gases and proceed only when the area is found to be safe.
Do not open the Electronics Enclosure or other covers/doors, and do
not power up/down the analyzer (or computer) if there is a flammable
gas atmosphere present.
1. Manually Zero the analyzer.
After the Zero is complete, close the Sample Valve and then the Vent
Valve on the ASR900 Sample Probe to isolate the analyzer from the
sample stream.
2. Power down the analyzer:
General Purpose (GP) Analyzers:
Open the Electronics Enclosure and disconnect power from the
analyzer and its temperature zone circuitry by opening the Analyzer,
Oven Heater, and ASR Probe fuses, and by removing the Sample and
Vent Line fuses.
Purged Analyzers (Hazardous Locations):
Open the explosion-proof power-disconnect switch to disconnect
power from the analyzer and its temperature zone circuitry. Open the
Electronics Enclosure.
Wait 5 minutes to allow the high-voltage capacitors in the source-
lamp power supply to discharge.
!
WARNING
!
WARNING
NOTE
See Fuse Legend
inside Electronics Enclosure
door.
See “Manually Zeroing
the Analyzer” in Chapter 3.
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