Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1979-12-06
1982-03-30
Groody, James J.
Communications: electrical
Continuously variable indicating
With particular transmitter
34087004, 34087011, G08C 1904, G08C 1932
Patent
active
043227287
ABSTRACT:
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.
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: 3333239 (1967-07-01), Silverman
patent: 3562729 (1971-02-01), Hurd
patent: 3961317 (1976-06-01), De Brem
patent: 4142148 (1979-02-01), Johansson
Groody James J.
Systems, Science and Software
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