发明名称 |
PROCESS CONTROL LOOP CURRENT VERIFICATION |
摘要 |
Some embodiments are directed to a process device comprising a process variable sensor configured to generate an output signal indicative of a sensed process variable; loop current output circuitry configured to control a loop current on a two wire process control loop to a value based on the output signal; loop current measurement circuitry coupled to the process control loop and configured to generate a measured loop current value based on the loop current; and loop current verification circuitry configured to approximate the loop current value based on the output signal and properties of a low pass filter, and generate a diagnostic signal based on a comparison of the approximated loop current value and the measured loop current value. |
申请公布号 |
US2013325381(A1) |
申请公布日期 |
2013.12.05 |
申请号 |
US201213816333 |
申请日期 |
2012.05.29 |
申请人 |
VARNAK VALENTIN G.;SCHMIDT PAVEL P.;BELOV LEONID I.;ROSEMOUNT INC. |
发明人 |
VARNAK VALENTIN G.;SCHMIDT PAVEL P.;BELOV LEONID I. |
分类号 |
G01R19/00 |
主分类号 |
G01R19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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