Pressure transmitter employing non-linear temperature...

Details Pressure transmitter employing non-linear temperature... Pressure transmitter employing non-linear temperature...

G - Physics

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G01L 9/04 (2006.01) G01D 3/036 (2006.01) G01D 5/16 (2006.01) G01L 1/22 (2006.01) G01L 9/06 (2006.01) G01L 19/04 (2006.01)

Patent

CA 1174077

ABSTRACT OF THE DISCLOSURE A pressure transmitter is provided for producing a voltage signal representative of the magnitude of pressure being applied to a diaphragm of the transmitter, wherein a network including strain-sensitive resistors that are formed in the diaphragm is coupled to the output of a constant-current power supply for producing the voltage signal in response to the strain generated by the applied pressure in the diaphragm and a feedback circuit operates in a non-linear manner for generating a control signal in response to a temperature signal produced by the network. The power supply coupled to receive the control signal is responsive thereto for changing the current supplied to the network so that compensation is thereby provided for errors in the pressure measurement caused by changes in the temperature of the network resistors.

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