JPS54159277A - Temperature measuring apparatus - Google Patents

Temperature measuring apparatus

Info

Publication number
JPS54159277A
JPS54159277A JP6842878A JP6842878A JPS54159277A JP S54159277 A JPS54159277 A JP S54159277A JP 6842878 A JP6842878 A JP 6842878A JP 6842878 A JP6842878 A JP 6842878A JP S54159277 A JPS54159277 A JP S54159277A
Authority
JP
Japan
Prior art keywords
light
temperature measuring
bridge circuit
circuit
pct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6842878A
Other languages
Japanese (ja)
Other versions
JPS5828538B2 (en
Inventor
Masatoshi Wakahara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6842878A priority Critical patent/JPS5828538B2/en
Publication of JPS54159277A publication Critical patent/JPS54159277A/en
Publication of JPS5828538B2 publication Critical patent/JPS5828538B2/en
Expired legal-status Critical Current

Links

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  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

PURPOSE:To alarm upper limit and lower limit burn-outs by inserting diodes in the two sides of a bridge circuit including the side where a temperature measuring resistor is inserted, letting a light emitting element emit light through conduction of the diodes and operating an alram by the light received thereby. CONSTITUTION:Two sides of a bridge circuit 11 are formed by a temperature measuring resistor RTD and a span adjusting resistance RS, resistance R1. When the A or C point of the bridge circuit 11 disconnects, the positive polarity potential of a power source Eb causes a transistor Q1 to go ON, then current flows in a diode D1 and light emitting element PCD, causing the element to emit light. The light thereof enters a photo detector PCT, which then goes ON to let the nagative input part of a DC amplifier A2 be grounded through up terminal 14 and PCT. As a result, the 1/2 voltage of a power source Ec determined by resistances R5, R6 is applied to the positive input part of A2 and the high voltage signal is applied to the constant current circuit 13 and the constant current above 100% flows from the circuit 13, thereby operating an alarm device 17 connected to a transistor Q3.
JP6842878A 1978-06-07 1978-06-07 temperature measuring device Expired JPS5828538B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6842878A JPS5828538B2 (en) 1978-06-07 1978-06-07 temperature measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6842878A JPS5828538B2 (en) 1978-06-07 1978-06-07 temperature measuring device

Publications (2)

Publication Number Publication Date
JPS54159277A true JPS54159277A (en) 1979-12-15
JPS5828538B2 JPS5828538B2 (en) 1983-06-16

Family

ID=13373403

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6842878A Expired JPS5828538B2 (en) 1978-06-07 1978-06-07 temperature measuring device

Country Status (1)

Country Link
JP (1) JPS5828538B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58187875A (en) * 1982-04-26 1983-11-02 Chino Works Ltd Disconnection detecting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58187875A (en) * 1982-04-26 1983-11-02 Chino Works Ltd Disconnection detecting circuit
JPH0245831B2 (en) * 1982-04-26 1990-10-11 Chino Corp

Also Published As

Publication number Publication date
JPS5828538B2 (en) 1983-06-16

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