Source: http://www.google.com/patents/US6356191?ie=ISO-8859-1&dq=6985872
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Patent US6356191 - Error compensation for a process fluid temperature transmitter - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA process fluid temperature transmitter includes circuitry that improves compensation of error due to the presence of one or more non-associated voltage sources in a resistance temperature device (RTD) circuit. A method of compensating for such error is also provided....http://www.google.com/patents/US6356191?utm_source=gb-gplus-sharePatent US6356191 - Error compensation for a process fluid temperature transmitterAdvanced Patent SearchPublication numberUS6356191 B1Publication typeGrantApplication numberUS 09/335,212Publication dateMar 12, 2002Filing dateJun 17, 1999Priority dateJun 17, 1999Fee statusPaidAlso published asDE10084718T0, DE10084718T1, WO2000079501A1Publication number09335212, 335212, US 6356191 B1, US 6356191B1, US-B1-6356191, US6356191 B1, US6356191B1InventorsWilliam R. Kirkpatrick, Eric D. RotvoldOriginal AssigneeRosemount Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (103), Non-Patent Citations (108), Referenced by (27), Classifications (15), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetError compensation for a process fluid temperature transmitterUS 6356191 B1Abstract A process fluid temperature transmitter includes circuitry that improves compensation of error due to the presence of one or more non-associated voltage sources in a resistance temperature device (RTD) circuit. A method of compensating for such error is also provided.
7. The transmitter of claim 2, wherein the loop communicator is adapted to communicate in accordance with a protocol selected from the group consisting of HART�, FOUNDATION� Fieldbus, Profibus, DeviceNet, CAN, and Lonworks.
BACKGROUND OF THE INVENTION The process industry employs process variable transmitters to monitor process variables associated with substances such as solids, slurries, liquids, vapors, and gasses in chemical, pulp, petroleum, pharmaceutical, food and other food processing plants. Process variables include pressure, temperature, flow, level, turbidity, density, concentration, chemical composition and other properties. A process fluid temperature transmitter provides an output related to a sensed process substance temperature. The temperature transmitter output can be communicated over a process control loop to a control room, or the output can be communicated to another process device such that the process can be monitored and controlled In order to monitor a process fluid temperature, the transmitter includes a sensor, such as a resistance temperature device (RTD).
SUMMARY OF THE INVENTION A process fluid temperature transmitter provides a process fluid temperature output that is substantially independent of any non-associated voltage, thus reducing RTD measurement error. The transmitter includes a plurality of terminals that are couplable to a resistance temperature device (RTD) to form a circuit including at least one non-associated voltage source having a non-associated voltage.
DETAILED DESCRIPTION OF THE EMBODIMENTS Although the present invention will be described with reference to embodiments of process fluid temperature transmitters, and the manner in which non-associated voltage correction is effected, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention, which are defined by the appended claims.
Loop communicator 20 is couplable to process control loop 16 (shown in phantom) and is adapted to communicate over process control loop 16. Process control loop 16 is any physical configuration that is capable of passing signals related to process information. For example, process control loop 16 can be a two-wire, 4-20 mA process control loop. A process variable transmitter coupled to such a process control loop controls the amount of current flowing through the loop such that the current corresponds to the process variable. In some process control loop embodiments, the energization levels are low enough to comply with the intrinsic safety specification as set forth in the Factory Mutual Approval Standard entitled �Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1 Hazardous (Classified) Locations,� Class Number 3610, published October 1988. Some process variable transmitters can operate on such low energy levels that they can receive all required electrical power from a 4-20 mA process control loop.
Loop communicator 20 can include a 4-20 mA communication section for analog communication. For digital signals, communicator 20 can include a Highway Addressable Remote Transducer (HART�) communication section, a FOUNDATION� Fieldbus communication section, or any other appropriate section such as a Profibus section, a Controller Area Network (CAN) section, a DeviceNet section, or a Lonworks section. Additionally, various sections can be included together. For example, a 4-20 mA section can be combined with a HART� section to provide both analog and digital communication. Thus, loop communicator 20 is adapted for bi-directional communication over process control loop 16 according to one or more selected protocols in a known manner.
Power supply 42, like loop communicator 20, is couplable to process control loop 16. Power supply 42 is adapted to receive power from process control loop 16 and provide the received power to the various components within transmitters 40, 50 and 60 as indicated by the arrow labeled �TO ALL.� Thus, transmitters 40, 50 and 60 can be wholly powered with power received from process control loop 16. Additionally, such loop powered transmitters can be intrinsically safe, and be couplable to two, three, or four-wire process control loops.
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