G - Physics – 01 – N
Patent
G - Physics
01
N
324/43
G01N 27/12 (2006.01) G01N 27/02 (2006.01) G01N 27/04 (2006.01) G01R 27/02 (2006.01)
Patent
CA 1050114
ABSTRACT An intrinsically safe system for monitoring the condition of mater- ials includes a low power, stable frequency RF oscillator of the class C type comprising a resonant circuit which is coupled to a bridge network including the admittance of materials between a probe electrode and a grounded support member juxtaposed to the materials. The output of the network generates an AC error signal which is applied to a phase sensitive detector including a chopper and a low power chopper drive for generating a DC signal representing the mag- nitude of the AC signal at a predetermined phase angle. The bridge network which may be linearly calibrated is isolated from the oscillator and the output error signal circuitry so as to allow the oscillator and the output error sig- nal circuitry to float with respect to the grounded support member and the power supply associated therewith. The rms voltage across the admittance re- presenting the condition of materials is limited so as to permit the system to comprise a two-wire transmitter wherein the sole source of power for the trans- mitter is derived from a 4-20 milliamp current drawn by the transmitter.
235144
Kramer L. Jonathan
Loewenstern Kenneth M.
Maltby Frederick L.
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