Source: http://www.google.com/patents/US6519546?dq=5537618
Timestamp: 2017-05-23 01:23:46
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Matched Legal Cases: ['art 2', 'art 2', 'art 3', 'art 3', 'art 2', 'art 2', 'art 4', 'art 4', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09']

Patent US6519546 - Auto correcting temperature transmitter with resistance based sensor - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA transmitter in a process control system includes a resistance-based sensor sensing a process variable and providing a sensor output. Self heating circuitry coupled to the sensor provides a self heating signal related to the sensor. Analog-to-digital conversion circuitry coupled to the sensor output...http://www.google.com/patents/US6519546?utm_source=gb-gplus-sharePatent US6519546 - Auto correcting temperature transmitter with resistance based sensorAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6519546 B1Publication typeGrantApplication numberUS 09/175,832Publication dateFeb 11, 2003Filing dateOct 19, 1998Priority dateNov 7, 1996Fee statusPaidAlso published asCA2346095A1, CN1183377C, CN1323389A, EP1131614A1, US6594603, WO2000023776A1Publication number09175832, 175832, US 6519546 B1, US 6519546B1, US-B1-6519546, US6519546 B1, US6519546B1InventorsEvren Eryurek, Jogesh WarriorOriginal AssigneeRosemount Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (241), Non-Patent Citations (145), Referenced by (108), Classifications (15), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetAuto correcting temperature transmitter with resistance based sensor
One aspect of the invention includes a new technique for determining the self heating (SH) index of an RTD sensor. Typically, prior art self heating index measurement was performed by monitoring temperature change in the RTD due to an applied current. However, in a transmitter it is impractical to perform such a measurement due to power limitations and the necessity of a separate temperature measurement. The present invention includes defining the self heating index as the change in sensor resistance for a given change in the power input to the RTD sensor. This technique is preferable for a temperature transmitter because it does not require the RTD to be calibrated. Furthermore, the technique does not require the RTD to be removed from the process such that real-time data can be collected without the trouble and cost of interrupting the process. The self heating index can be calculated in a transmitter by applying two different input currents, for example, 5 mA and 15 mA. The resulting voltages across the RTD are measured and the resistance of the sensor is calculated at the two different currents using the equation R =V/I. The power applied to the RTD is determined at the two different currents as P =I·V. The self heating index is calculated in accordance with equation 1: SHI = R 1 - R 2 P 1 - P 2 Eq .  1 The invention can be practiced in any of a number of places in a process system control system. In particular, the present invention as realized in software and a microprocessor, can reside in a central controller or even a final control element 12 such as a valve, motor or switch as shown in FIG. 1. Furthermore, modern digital protocols such as Fieldbus, Profibus and others allow for the software which practices the present invention to be communicated between elements in a process control system, and also provide for process variables to be sensed in one transmitter and then sent to the software.
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KGFunktionselektronikmodulWO2007106803A3 *Mar 13, 2007Nov 20, 2008Huamin CaiAdaptive temperature controller* Cited by examinerClassifications U.S. Classification702/130, 374/172, 374/1, 374/E15.001, 702/99International ClassificationG08C19/02, G05B23/02, G07C3/00, G01K15/00Cooperative ClassificationG01K15/00, G07C3/00, G08C19/02European ClassificationG01K15/00, G07C3/00, G08C19/02Legal EventsDateCodeEventDescriptionOct 19, 1998ASAssignmentOwner name: ROSEMOUNT INC., MINNESOTAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ERYUREK, EVREN;WARRIOR, JOGESH;REEL/FRAME:009541/0709;SIGNING DATES FROM 19980812 TO 19981019Jan 27, 2004CCCertificate of correctionJun 13, 2006FPAYFee paymentYear of fee payment: 4Jul 31, 2010FPAYFee paymentYear of fee payment: 8Aug 11, 2014FPAYFee paymentYear of fee payment: 12RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services