Through the probe performance audits of continuous ambient air analyzers
- California Air Resources Board, Sacramento, CA (United States)
The California Air Resources Board (CARB) has been conducting through the probe (TTP) performance audits of continuous ambient air analyzers since 1981. TTP performance audits are conducted by presenting audit gases through the probe inlet of ambient air monitoring stations, as opposed to presenting audit gases to the back of the analyzers. This technique tests the integrity of the air monitoring station`s entire sampling system. The CARB uses the TTP audit technique to audit criteria as well as non-criteria analyzers. The CARB`s Quality Assurance Section (QAS) uses a self-sufficient audit van to conduct TTP audits. The audit gas concentrations are generated in the van using a gas calibrator to dilute multi-blend gases with zero air. The audit gas is then delivered to the station through a presentation line. The gas calibrator is capable of generating ozone for ozone audits and gas phase titration of nitrogen oxide. The TTP audit technique and the use of multi-blend gas cylinders allow for simultaneous audits of multiple analyzers.
- OSTI ID:
- 617776
- Report Number(s):
- CONF-9704195--
- Country of Publication:
- United States
- Language:
- English
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