5-40 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
To replace the Heater Elements and RTDs (Figures 5-6, 5-7, 5-8, 5-9, and
5-10):
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.
Replacing Parts in the Heater Plate
Maintenance on the Heater Plate is not required unless any of its com-
ponents fail. If failure occurs, it will be necessary to replace the Heater
Elements and RTDs in the Heater Plate.
RTD Resistance Check
Before removing a RTD, test the problematic RTD using the following
table to verify its operation.
!
WARNING
See Fuse Legend
inside Electronics Enclosure
door.
See Chapter 6 for
spare part ordering numbers.
See “Manually Zeroing
the Analyzer” in Chapter 3.
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