INDUSTRIAL PROCESS CONTROL TRANSMITTER WITH MULTIPLE SENSORS
First Claim
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1. An industrial process control transmitter, comprising:
- a first input configured to couple to a first sensor;
a second input configured to couplet 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.
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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.
174 Citations
24 Claims
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1. An industrial process control transmitter, comprising:
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a first input configured to couple to a first sensor; a second input configured to couplet 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of measuring sensor values from first and second sensors in an industrial process control transmitter, comprising:
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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. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus for measuring sensor values from first and second sensors in an industrial process control transmitter, comprising:
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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.
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Specification