[특허]Instrumentation and monitoring systems employing differential temperature sensors

[미국특허] Instrumentation and monitoring systems employing differential temperature sensors 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G08B-021/00
출원번호	US-0196707 (1988-05-20)
발명자 / 주소	Twerdochlib Michael (Oviedo FL)
출원인 / 주소	Westinghouse Electric Corp. (Pittsburgh PA 02)
인용정보	피인용 횟수 : 32 인용 특허 : 12

초록 ▼

Instrumentation and monitoring systems utilize, as differential temperature sensors, heated, split-well thermowells of duplex design, mounted to the sidewall of a pressure vessel and communicating through a penetration in the sidewall with the fluid state within the vessel. Each probe has at least one parallel axial bore therein, a related, selected pair of probes receiving respective heater and temperature sensing elements in the associated bores and together functioning as a differential temperature sensor producing distinguishable, differential temperature outputs representative of the presence of steam versus water. The systems monitor the differential temperature outputs of plural such sensors to produce alarm indications and perform verification and error checking of the sensor output indications. Duplex sensor embodiments permit toggling between different, selected such pairs of probes for on-line testing and verification of monitored conditions represented by the sensor output indications and of the operability of the elements and supporting circuits, under automatic and manual controls, and with on-line substitution of complementary elements in the event of element failure.

대표청구항 ▼

An instrumentation system for monitoring fluid conditions within the interior of a pressure vessel, comprising: at least one duplex differential temperature sensor having a pair of first and second substantially identical probes integrally interconnected at first ends thereof and extending in parallel axial relationship and spaced by a bilateral plane and adapted to be mounted to the sidewall of a pressure vessel with the probes in communication through a penetration in the sidewall with the fluid state within the interior of the pressure vessel, each said probe incorporating a heater element and a pair of associated temperature sensing elements, the heater element and a selected temperature sensing element of said first probe and a selected temperature sensing element of said second probe comprising a first differential temperature sensor component and the heater element of the said second probe and a selected temperature sensing element thereof and a selected temperature sensing element of said first probe comprising a second differential temperature sensor component: heater controller means for selectively supplying electrical power to said respective heater elements of said first and second probes of said sensor, the selected heater element heating the corresponding probe and raising the temperature thereof, in the absence of a fluid in the line contacting and dissipating heat from the probe, and thereby producing a difference between the temperatures sensed by the selected temperature sensing elements associated with the respective, heated and unheated probes of the sensor, said heater controller means further comprising means for determining operability of each of the heater elements of the sensor and producing an inoperative heater element output upon determining the inoperability of a heater element; temperature sensing element controller means for selecting the temperature sensing elements of the first and second probes and for monitoring the sensed temperature outputs of the selected temperature sensing elements, for providing a differential temperature output indicative of the difference between the respective, sensed temperature outputs of the selected temperature sensing elements of the first and second probes, and for determining the operability of the selected temperature sensing elements of the first and second probes; and system control means for controlling said heater and temperature sensing element controller means to select the heater and sensing elements of each sensor corresponding to the first sensor component thereof in a normal monitoring mode of the instrumentation system, for defining a normal differential temperature output condition, for detecting an alarm condition in the normal monitoring mode when the differential temperature output of the selected, first sensor component differs from the normal differential temperature condition, and for producing an alarm output in response to detecting an alarm condition; display means responsive to an alarm output of said system control means for producing an alarm display identified with the corresponding sensor; and said system control means being responsive to an inoperative heater element output from said heater controller for the selected heater of said first probe, corresponding to the first sensor component, for automatically causing said heater controller to select the heater element of the second probe and supply electrical power thereto and thereby to switch from the first to the second sensor component of the given sensor.

이 특허에 인용된 특허 (12) 인용/피인용 타임라인 분석

Watanabe Takao (Hitachi JA), Control system for steam generator.
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Smith Robert D. (Bethesda MD), Coolant condition monitor for nuclear power reactor.
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Lyman Walter G. (Monroeville PA), Dual temperature sensing device having twin well thermowell for dual resistance temperature detectors.
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McQueen Malcolm M. (1755 La Costa Meadows Dr. San Marcos CA 92069), Guide tube inserted liquid level sensor.
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Bevilacqua Frank (Windsor CT) Burger Joseph M. (Granby CT), Heated junction thermocouple level measurement apparatus.
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Eggenberger Markus A. (Schenectady NY) Miller Edward H. (Rexford NY), Moisture detector for steam line.
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Rolstad Erik (Halden NOX), Multijunction difference thermocouples for gamma sensors.
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Kydd Paul H. (Lawrenceville NJ), Multiple thermocouple system for high temperature reactors.
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Hildebrand James R. (Palm Beach Gardens FL) Sobanski Kurt J. (North Palm Beach FL), Multiple thermocouple testing device.
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Stansbury Benny W. (115 Jason West Monroe LA 71291), Operation and command failure monitor.
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Dawley Robert E. (123 Bacon St. Natick MA 01760), Temperature control system.
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Stillman Gerald T. (Fullerton CA) Pawlowski Michael (Chino CA) McDavid Larry S. (Anaheim CA), Temperature control system for cutaneous gas monitor.
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이 특허를 인용한 특허 (32) 인용/피인용 타임라인 분석

Bellis, Mark; Thornton, Paul, Apparatus for fluid temperature measurement.
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Irwin Craig W. ; Khalid Syed J., Controlling stall margin in a gas turbine engine during acceleration.
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Bosbach, Franz; Hanewald, Dieter; Hellmann, Dieter-Heinz; Stecker, Ulrich; Urschel, Sven, Device and method for detecting deposits.
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Arthur D. Watkins ; Collins P. Cannon ; Charles R. Tolle, Device and method for self-verifying temperature measurement and control.
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Watkins, Arthur D.; Cannon, Collins P.; Tolle, Charles R., Device for self-verifying temperature measurement and control.
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Paielli, Perry M.; Beesley, Peter A., Differential carrier temperature sensing method.
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Kharsa, John; Iizumi, Eddie, Dual sensor head configuration in a fluid flow or liquid level switch.
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Scott, Allen; Stout, William, Electric water heater with pulsed electronic control and detection.
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Fittz John H. ; Mauldin Robert H., Heated junction thermocouple cable arrangement.
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Pfau, Axel; Iselt, Torsten; Boguhn, Dirk, Housing of a temperature sensor, especially of a thermal flow measuring device.
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Kent, Richard, Leak detector comprising a self-heated thermistor control circuit.
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Durkee, Scott Robert; Coffman, Keith Eugene, Method and apparatus for detecting a dry/wet state of a dual exposed thermistor bead liquid level sensor.
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Hall, Robbie William, Method and apparatus for detecting a dry/wet state of a thermistor bead.
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Hall, Robbie William, Method and apparatus for detecting a dry/wet state of a thermistor bead.
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Snelling, Charles Darwin, Method and apparatus for detecting the internal liquid level in a vessel.
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Niedzballa, Günter, Method and device for monitoring the fill level of a liquid in a liquid container.
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Wolferseder, Thomas J., Method for measuring ash/slag deposition in a utility boiler.
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Andersen Bo L., Method of determining contact wear in a trip unit.
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Bo L. Andersen, Method of determining contact wear in a trip unit.
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John J. Dougherty ; Bo L. Andersen, Method of determining contact wear in a trip unit.
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Cartwright, Kirby W., Methods for preventing a dry fire condition and a water heater incorporating same.
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Hosler, Robert B.; Wang, Xiangwen; Bruggeman, Jay N.; O'Connor, Patrick J., Molten cryolitic bath probe.
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Brassart Gary Arthur ; Sterrett Charles Raymond ; Srinivasan Jagannathan S., Nuclear steam supply temperature measurement system and method.
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Engelstad, Loren Michael; Bauschke, Dirk Willy; Rud, Jason Harold, Online calibration of a temperature measurement point.
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Engelstad, Loren Michael; Bauschke, Dirk Willy; Rud, Jason Harold, Online calibration of a temperature measurement point.
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Engelstad, Loren Michael; Bauschke, Dirk Willy; Rud, Jason Harold, Online calibration of a temperature measurement point.
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Lunghofer James G. ; Brannon C. Tom ; Conner Bernard L. ; Transier Lee ; Cannon Collins P., Self-verifying temperature sensor.
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Webb, Peter D, Sensor measurement error.
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Seip, James N.; Seip, Tyler; Epstein, Jonathan, Sensor reservoir with probe to monitor, measure, and control fire sprinkler and other systems and method of constructing and using the same.
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Johns, Charles Ray; Wang, Michael Fan, Tracing thermal data via performance monitoring.
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Cooley Harold J. ; Bischoff Lawrence C. ; Delany Ernest W. ; Pagano Frank ; Sitcoske Mark A. ; Yaroshevskiy Georgiy V., Vehicle compartment temperature recorder.
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Scott Allen W., Water heater with electronic control.
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A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Instrumentation and monitoring systems employing differential temperature sensors 원문보기