Process variable transmitter system with analog communication
First Claim
1. A process variable transmitter system for sensing a first pressure at a first location and second pressure at a second location, comprising:
- a first process variable transmitter having;
a first pressure sensor configured to sense the first pressure; and
a first analog output stage coupled to the first sensor configured to provide a first analog output signal related to the first pressure;
a second process variable transmitter having;
a second pressure sensor configured to sense the second pressure, the second pressure sensor spaced apart from the first pressure sensor;
a second analog output stage configured to provide a second analog output related to the second pressure;
an analog processing stage configured to provide a processed output related to the first and second pressures; and
a two-wire output circuitry configured to provide an analog current output on a two-wire process control loop based upon the processed output.
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Accused Products
Abstract
A process variable transmitter system for sensing a first pressure at a first location and second pressure at a second location, includes a first transmitter having a first pressure sensor configured to sense the first pressure and first analog output stage coupled to the first sensor configured to provide an analog output signal related to the first pressure. A second pressure transmitter includes a second pressure sensor configured to sense the second pressure and spaced apart from the first pressure sensor. A second analog output stage provides an analog output related to the second pressure. An analog processing stage provides a processed output related to the first and second pressures. A two-wire output is configured to provide an analog current output on a two-wire process variable loop based upon the processed output.
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Citations
20 Claims
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1. A process variable transmitter system for sensing a first pressure at a first location and second pressure at a second location, comprising:
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a first process variable transmitter having; a first pressure sensor configured to sense the first pressure; and a first analog output stage coupled to the first sensor configured to provide a first analog output signal related to the first pressure; a second process variable transmitter having; a second pressure sensor configured to sense the second pressure, the second pressure sensor spaced apart from the first pressure sensor; a second analog output stage configured to provide a second analog output related to the second pressure; an analog processing stage configured to provide a processed output related to the first and second pressures; and a two-wire output circuitry configured to provide an analog current output on a two-wire process control loop based upon the processed output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of sensing a first pressure at a first location and a second pressure at a second location comprising:
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sensing a first pressure using a first pressure sensor at the first location with a first process variable transmitter; providing a first analog output signal based upon the first sensed pressure; sensing a second pressure at a second location spaced apart from the first location with a second process variable transmitter; providing a second analog output related to the second pressure; receiving, at the second location in the second process variable transmitter the first and second analog outputs and responsively generating a processed output based upon the first and second analog outputs; and applying a current level to a two-wire process control loop based upon the difference output. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification