Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1980-08-20
1982-07-13
Brigance, Gerald L.
Communications: electrical
Continuously variable indicating
With particular transmitter
34087039, 324 60C, 324 60CD, G08C 1910
Patent
active
043397506
ABSTRACT:
A low power transmitter has a D.C. Power supply for providing the transmitter with power. The supply is coupled to a voltage regulator for regulating the voltage to the transmitter and the regulator is further coupled to an oscillator which provides a time varying voltage signal to a capacitance sensor which varies as a function of the parameter to be sensed. The charging and discharging current pulses from the sensor, as affected by such sensors, are rectified and fed to an oscillator driver amplifier which controls the time varying voltage as a function of such rectified signals. The rectified signals are also fed to a low power consumption output amplifier which provides a zero based D.C. voltage output signal representative of the parameter to be sensed along two wires. The transmitter operates on low voltage and has a low power consumption.
REFERENCES:
patent: Re27596 (1973-03-01), Hurd
patent: 3271669 (1966-09-01), Lode
patent: 3318153 (1967-05-01), Lode
patent: 3646538 (1972-02-01), Frick
patent: 3775687 (1973-11-01), Machlanski
patent: 3854039 (1974-12-01), Serrano
patent: 3859594 (1975-01-01), Grindheim
patent: 3975719 (1976-08-01), Frick
patent: 4149231 (1979-04-01), Bukosky et al.
patent: 4193063 (1980-03-01), Hitt et al.
E Output Schematic Drawing 1151-135, Rev. H., Rosemount Inc.
Brigance Gerald L.
Rosemount Inc.
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