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Thermocouple Continuity Checker

IP.com Disclosure Number: IPCOM000089365D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Poenisch, AP: AUTHOR

Abstract

This thermocouple continuity checker has the circuit Shown in the drawing. A pyrometer 10 is connected to the thermocouple 12 with a circuit having resistances R(1) and R(2). R(1) is adjusted so that R(1) and R(2) plus the thermocouple resistance should equal the required input impedance of the pyrometer 10. A standard cell 14, such as a mercury cell, is connected to both sides of R(2). The cell 14 is installed with a polarity to increase the pyrometer deflection when push-button switch 16 is depressed. If all of the connections are making proper contact, the increased deflection will always be the same when switch 16 is depressed. If a poor contact develops, the deflection will be smaller. Resistance R(3) adjusts the deflection so that the pyrometer will remain on the scale.

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Thermocouple Continuity Checker

This thermocouple continuity checker has the circuit Shown in the drawing. A pyrometer 10 is connected to the thermocouple 12 with a circuit having resistances R(1) and R(2). R(1) is adjusted so that R(1) and R(2) plus the thermocouple resistance should equal the required input impedance of the pyrometer 10. A standard cell 14, such as a mercury cell, is connected to both sides of R(2). The cell 14 is installed with a polarity to increase the pyrometer deflection when push-button switch 16 is depressed. If all of the connections are making proper contact, the increased deflection will always be the same when switch 16 is depressed. If a poor contact develops, the deflection will be smaller. Resistance R(3) adjusts the deflection so that the pyrometer will remain on the scale.

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