Two-wire transmitter with totalizing counter

Details Two-wire transmitter with totalizing counter Two-wire transmitter with totalizing counter

1976-10-05

1978-04-11

Yusko, Donald J.

Communications: electrical

Systems

Call station

235 92FL, 73194VS, G01F 132, G01R 2306, G08C 1902

Patent

active

040841553

ABSTRACT:
A two-wire transmitter operating in conjunction with a meter whose output signal varies in frequency as a function of the metered variable. The meter signal is changed into an analog voltage that is converted by the transmitter into a corresponding output current and conveyed to a receiving station over a two-wire line which also supplies operating voltage to the transmitter. In the transmitter, the analog voltage is applied to a differential amplifier which converts the voltage into an output current via a transistor acting as a variable impedance across the line to make up the difference between the operating current drawn by the transmitter and the output current. This make-up current is stored to provide an energy source for operating a totalizing counter coupled to the meter to determine the total amount of the variable passing through the meter.

REFERENCES:
patent: 3783248 (1974-01-01), Sugden, Jr.
patent: 3873814 (1975-03-01), Mirdadian
patent: 3948098 (1976-04-01), Richardson

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