Long term particle monitoring

Details Long term particle monitoring Long term particle monitoring

1990-07-19

1992-03-10

Wieder, Kenneth A.

Electricity: measuring and testing

A material property using electrostatic phenomenon

Frictionally induced

324 711, G01N 2760

Patent

active

050952757

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.

REFERENCES:
patent: 2209614 (1940-07-01), Rowley
patent: 3699348 (1972-10-01), Hocherl
patent: 4714890 (1987-12-01), Dechene et al.
patent: 4904944 (1990-02-01), Dechene et al.
patent: 4961147 (1990-10-01), Moore

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