Fluid status detector

Details Fluid status detector Fluid status detector

1987-11-05

1989-08-08

Levy, Stewart J.

Communications: electrical

Condition responsive indicating system

With particular system function

73 492, G08B 1900, G01M 332

Patent

active

048557145

ABSTRACT:
There is a controller connected to a plurality of probes via a transmission line. Each probe includes sensors which provide voltage signals related to the fluid status in the probe environment. The voltage signals are applied to a voltage controlled oscillator which in turn provides an oscillating signal for transmission to the controller. A counter in the controller is controlled by a timer to count the number of oscillations of the transmitted signal over a predetermined time period. The count is represented by a digital signal which is processed to provide an indication of the fluid status of the probes. Probe circuit temperature is also transmitted to the controller for use in correcting the received oscillator frequency.

REFERENCES:
patent: 4646069 (1987-02-01), Andrejasich et al.
patent: 4736193 (1988-04-01), Slocum et al.
patent: 4740777 (1988-04-01), Slocum et al.

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