Importance

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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.

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First Claim