Admittance measuring system for monitoring the condition of mate

Electricity: measuring and testing – Conductor identification or location – Inaccessible

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Details

324 58R, 324 57R, 324 585A, 324 58A, G01R 1152, G01R 2726

Patent

active

041468341

ABSTRACT:
A two-wire transmitter includes an admittance sensing probe adapted to sense the conditions and corresponding admittance of materials. The probe is coupled into an admittance responsive network which generates an admittance signal representing the condition of materials. The output current from the transmitter is varied in response to the admittance signal. In one embodiment of the invention, the admittance responsive network comprises a variable frequency oscillator whose frequency varies with the admittance of the materials. In another embodiment, the admittance responsive network comprises a ramp generator with a frequency which varies with the admittance of the materials. In another embodiment, the admittance responsive network comprises a bridge whose balance changes in response to the admittance of the materials.

REFERENCES:
patent: 3626285 (1969-08-01), Hartke
patent: 3648165 (1972-03-01), Shawhan
patent: 3746975 (1973-07-01), Maltby
patent: 3778705 (1973-12-01), Maltby
patent: 3805156 (1974-04-01), Norton et al.

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