Transmitter with an improved span adjustment

Details Transmitter with an improved span adjustment Transmitter with an improved span adjustment

G - Physics

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G01L 19/04 (2006.01) G01D 3/02 (2006.01) G01G 7/06 (2006.01) G01G 19/413 (2006.01) G01G 23/01 (2006.01) G01L 9/12 (2006.01)

Patent

CA 1307940

ABSTRACT OF THE DISCLOSURE A transmitter senses a process variable and provides a two-wire output adjusted by a span adjustment. The transmitter has a sensor which senses the process variable and provides a sensor signal. An output circuit provides a two-wire output representative of the sensed process variable. A span-controlling circuit is coupled between the sensor and the output circuit and receives a span adjustment. The span-controlling circuit includes an amplifier coupled to a potentiometer which adjusts the span based on the span adjustment. The wiper of the potentiometer is connected to the amplifier output so that one portion of the potentiometer resistance provides feedback from the amplifier output to the amplifier input. A second portion of the potentiometer resistance is coupled between the amplifier output and the output circuit. Both portions of resistance affect both the span and the resolution of the output. The arrangement provides an improved resolution over a wide turn-down-ratio.

548905

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