Two wire transmitter for converting a varying signal from a remo

Details Two wire transmitter for converting a varying signal from a remo Two wire transmitter for converting a varying signal from a remo

1979-01-19

1981-02-10

Robinson, Thomas A.

Communications: electrical

Continuously variable indicating

With particular transmitter

324 60R, 73141R, 34087039, G08C 1910, G06G 720

Patent

active

042504902

ABSTRACT:
A two wire current transmitter provides a current signal representative of a parameter measured by a variable reactance sensor which may be located in a hostile environment, remote from the signal conditioning and transmitter electronics through transmission circuitry from the electronics including a separate transformer winding energized by a pair of twisted cables to reduce the capacitive, inductive and resistive effects of long wires. The transformer circuitry provides power to the sensor which provides the signal conditioning and transmitter electronics a signal, representing the parameter measured, which controls the current control, to modify the total current through the same two wires used to carry power to the signal conditioning and transmitter electronics, so that the total current is representative of the measured parameter.

REFERENCES:
patent: 3271669 (1966-09-01), Lode
patent: 3318153 (1967-05-01), Lode
patent: 3646538 (1972-02-01), Frick
patent: 3680384 (1972-08-01), Grindheim
patent: 3854039 (1974-12-01), Serrano
patent: 3859594 (1975-01-01), Grindheim
patent: 3975719 (1976-08-01), Frick
patent: 3997733 (1976-12-01), Sanders
patent: 4118977 (1978-10-01), Olsen et al.
patent: 4146834 (1979-03-01), Maltby et al.

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