3-38 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Sample System Leak Check
The analyzer has been checked at the factory for pressure leaks. However,
fittings can loosen during transport, and the Sample, Vent, Instrument
Air, and Calibration Gas lines are installed on-site. Therefore, the entire
sample system should be checked for leaks before any sample gas is intro-
duced into the system for the first time or following the replacement of
any lines/fittings or Measuring Cell parts.
Hazardous Locations
Before proceeding, test the area around the analyzer for hazardous
gases and proceed only when the area is found to be safe.
Preventing leaks in the sample system is critical to ensure proper
analyzer operation. If sample gas migrates into the Optical Bench
Assembly or Reflector Block due to a leak in the Measuring Cell, the
optics will become damaged and most likely require replacement. Most
leaks are preventable with the regular replacement of the Measuring
Cell o-rings.
To leak check the sample system:
1. With the analyzer powered up, open the Aspirator Drive Air
Regulator to allow instrument air into the sample system.
2. Close the Sample and Vent isolation valves on the ASR900 Sample
Probe.
3. Use the Aspirator Drive Air Regulator (Figure 3-5) to increase the in-
strument air pressure to 70 KPAG (10 PSIG).
To avoid damaging the pressure transducer, do not set the pressure
higher than 105 KPAG (15 PSIG).
4. View the CellP (Measuring Cell Pressure) screen and record the nu-
meric value displayed. This value is the absolute pressure reading in
mmHg (or "Hg).
!
CAUTION
!
CAUTION
(CellP) RUNF6 8 6
!
WARNING
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