Industrial process control transmitter with multiple sensors
AssigneeRosemount Inc.
InventorsAndrew J. Bronczyk, Charles E. Goetzinger, Jason H. Rud, Clarence E. Holmstadt, Douglas W. Arntson
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Abstract
An industrial process control transmitter includes a first input configured to couple to a first sensor, and a second input configured to couple to a second sensor. Measurement circuitry is configured to couple to the first and second sensors and provide an output related to a sensed process variable. A multiplexer is configured to selectively couple the first and second sensors to the measurement circuitry. An equalizer circuit is coupled to the first and second sensors and configured to equalize a voltage potential between the first sensor and the measurement circuitry.
Claims24
An industrial process control transmitter, comprising:
- a first input configured to couple to a first sensor;
- a second input configured to couple to a second sensor;
- measurement circuitry configured to couple to the first and second sensors and provide an output related to a sensed process variable;
- a multiplexer configured to selectively couple the first and second sensors to the measurement circuitry;
- and
- an equalizer circuit coupled to the first and second sensors configured to equalize a voltage potential between the first sensor and the measurement circuitry.
A method of measuring sensor values from first and second sensors in an industrial process control transmitter, comprising:
- coupling a first sensor to measurement circuitry;
- measuring a value of the first sensor using the measurement circuitry;
- disconnecting the measurement circuitry from the first sensor;
- coupling the measurement circuitry to a reference potential;
- disconnecting the measurement circuitry from the reference potential;
- and
- measuring a value of the second sensor using the measurement circuitry.
An apparatus for measuring sensor values from first and second sensors in an industrial process control transmitter, comprising:
- means for coupling a first sensor to measurement circuitry;
- means for measuring a value of the first sensor using the measurement circuitry;
- means for disconnecting the measurement circuitry from the first sensor;
- means for coupling the measurement circuitry to a reference potential;
- means for disconnecting the measurement circuitry from the reference potential;
- and
- means for measuring a value of the second sensor using the measurement circuitry.
Dependencies are inferred from the claim text.