Long term particle monitoring
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United States of America Patent
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-
Mar 10, 1992
Grant Date -
N/A
app pub date -
Jul 19, 1990
filing date -
Jul 19, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Monitoring apparatus (10) of particles in a gas stream comprising a probe (12) and circuit (14) for detecting electrical activity of the probe and an actuator (20) for insertion and retraction of the probe into and out of the stream, the circuit providing periodic measurement of the retracted probe and self-adjustment to compensate for changing probe characteristics. The apparatus also provided probe cleaning and protection means (30, 32, 34, 36), which work in interaction with the self-check instrumentation. The self-check tests include baseline, gain and sensitivity monitoring.
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