Source: http://www.google.com/patents/US6754601?dq=5960409
Timestamp: 2014-07-24 09:47:39
Document Index: 613428124

Matched Legal Cases: ['art 2', 'art 3', 'art 3', 'art 2', 'art 2', 'art 2', 'art 4', 'art 4']

Patent US6754601 - Diagnostics for resistive elements of process devices - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsDiagnostic circuitry of a process device is used to detect degradation of a resistive element of the process device while the process device remains online, without the use of an additional power source. In addition, once degradation of the resistive element is detected, the diagnostic circuitry can...http://www.google.com/patents/US6754601?utm_source=gb-gplus-sharePatent US6754601 - Diagnostics for resistive elements of process devicesAdvanced Patent SearchPublication numberUS6754601 B1Publication typeGrantApplication numberUS 09/409,098Publication dateJun 22, 2004Filing dateSep 30, 1999Priority dateNov 7, 1996Fee statusPaidPublication number09409098, 409098, US 6754601 B1, US 6754601B1, US-B1-6754601, US6754601 B1, US6754601B1InventorsEvren Eryurek, Steven R. Esboldt, Gregory H. RomeOriginal AssigneeRosemount Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (107), Non-Patent Citations (158), Referenced by (20), Classifications (14), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetDiagnostics for resistive elements of process devicesUS 6754601 B1Abstract Diagnostic circuitry of a process device is used to detect degradation of a resistive element of the process device while the process device remains online, without the use of an additional power source. In addition, once degradation of the resistive element is detected, the diagnostic circuitry can be compensated for automatically. The diagnostic circuitry includes a testing circuit and a processing system. The testing circuit is coupled to the resistive element and is configured to apply a test signal to the resistive element. The test signal heats the resistive element and causes the resistive element to generate a response signal. The processing system compares a change in the response signal to a corresponding reference to detect degradation of the resistive element.
SUMMARY Diagnostic circuitry of a process device is used to detect degradation of a resistive element of the process device while the process device remains online, without the use of an additional power source. In addition, once degradation of the resistive element is detected, the diagnostic circuitry can be compensated for automatically. The diagnostic circuitry includes a testing circuit and a processing system. The testing circuit is coupled to the resistive element and is configured to apply a test signal to the resistive element. The test signal heats the resistive element and causes the resistive element to generate a response signal. The processing system compares a change in the response signal to a corresponding reference to detect degradation of the resistive element.
Data pertaining to the process and control signals used to control the process are two forms of process device information. Process device information can be transmitted between control room 6 and process devices 4 over control loops 8 by adjusting the current flowing through control loops 8. For example, two-wire process devices 4 typically adjust the current flowing through loop 8 between a lower alarm level IL and an upper alarm level IU, commonly 4 mA and 20 mA, respectively, to indicate a value of the process variable being monitored. Additionally, digital information can be transmitted over the control loops 8 in accordance with Highway Addressable Remote Transducer (HART�), FOUNDATION� Fieldbus, Profibus, or Ethernet protocols as is common in the industry.
Process device circuitry 30 can communicate with a process control system over control loop 8 using device input-output (I/O) circuit 62, shown in FIG. 4. In one embodiment of the invention, device I/O circuit 62 communicates with the process control system by adjusting current I between 4 and 20 mA in accordance with a known communication protocol. Suitable communication protocols include HART�, FOUNDATION� Fieldbus, Profibus, and Ethernet communication protocols. Additional protocols can also be used, for example, a four-wire configuration may be employed in which power is received from a separate source. If process device circuitry 30 is used in a process measurement transmitter, process device circuitry 30 can produce a process variable output, that is indicative of the value of the process variable being measured, using device I/O circuit 62. For example, if process device circuitry 30 is used in a temperature transmitter that utilizes RTD sensor 32 to measure the temperature of a process medium, then process device circuitry 30 can produce a process variable output, that is indicative of the temperature of the process medium, using device I/O circuit 62.
Another embodiment of diagnostic circuitry 14 can use a set of if�then rules to reach a conclusion on the status of the resistive element 12, such as that used in an RTD sensor 32. The difference D is monitored and its present value is compared to upper and lower boundaries. The upper and lower boundaries are empirically set by testing of many RTD sensors 32. A decision is made based upon the comparison.
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