Multichannel remote transducer monitoring system

摘要

A transducer monitoring system includes a transducer assembly positioned at a remote location which operates to measure the change in at least two separate physical phenomena. The transducer assembly is coupled to a central location, such as at the top of an oil drilling platform, by means of a single conductor with a grounded shield. The transducer assembly includes a stepper switch for separately selecting each of said transducer elements and for enabling current applied to said cable and transducer assembly to generate an output voltage representative of the present state of the resistance of each such transducer element. The improved invention requires only a single constant current pulse to both generate said output voltage and to switch the stepper switch to the next contact. Calibration and comparison resistors are also included in said transducer assembly.