Multichannel remote transducer monitoring system

Details Multichannel remote transducer monitoring system Multichannel remote transducer monitoring system

1981-07-29

1984-08-07

Groody, James J.

Communications: electrical

Continuously variable indicating

With particular transmitter

73151, 34087004, 34087011, 34087039, G08C 1904, G08C 1932

Patent

active

044646607

ABSTRACT:
A transducer monitoring system includes a transducer assembly positioned at a remote location which operates to measure one or more 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 cable. The transducer assembly comprises only passive components, including 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 periodically applied to the cable to both generate said output voltage and to switch the stepper switch to the next contact. A calibration circuit that measures temperature effects on the transducer assembly and cable is also included.

REFERENCES:
patent: 2132213 (1938-10-01), Locke
patent: 2414862 (1947-01-01), Fearon
patent: 2564198 (1951-08-01), Elkins
patent: 2565271 (1951-08-01), Sealander et al.
patent: 2819408 (1958-01-01), Swift
patent: 2963640 (1960-12-01), Buckner
patent: 3562729 (1971-02-01), Hurd
patent: 3961317 (1976-06-01), De Brem et al.
IBM Technical Disclosure Bulletin, Barr, vol. 13, No. 8, Jan. 1971, pp. 2255-2256.

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