GB863896A - A stable circuit for direct visual reading of temperatures - Google Patents

A stable circuit for direct visual reading of temperatures

Info

Publication number
GB863896A
GB863896A GB88360A GB88360A GB863896A GB 863896 A GB863896 A GB 863896A GB 88360 A GB88360 A GB 88360A GB 88360 A GB88360 A GB 88360A GB 863896 A GB863896 A GB 863896A
Authority
GB
United Kingdom
Prior art keywords
switches
resistors
temperature
contact
transistors
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.)
Expired
Application number
GB88360A
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.)
CECIL HARRY CHARLES MATTHEWS
RODERICK SUTHERLAND ROSS
Original Assignee
CECIL HARRY CHARLES MATTHEWS
RODERICK SUTHERLAND ROSS
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 CECIL HARRY CHARLES MATTHEWS, RODERICK SUTHERLAND ROSS filed Critical CECIL HARRY CHARLES MATTHEWS
Priority to GB88360A priority Critical patent/GB863896A/en
Publication of GB863896A publication Critical patent/GB863896A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit

Abstract

863,896. Temperature measuring devices. ROSS, R. S., and MATTHEWS, C. H. C. Jan. 11, 1960, No. 883/60. Class 40 (1). [Also in Group XL (c)] A temperature-sensitive circuit in a measuring device comprises two transistors T1 and T2 with their emitters coupled together and feedbacks connected between each base and collector, a temperature dependent resistor R2 which is connected to the base of one, T1, and a current-sensitive visual indicating device J, e.g. a moving coil meter, or operating relay connected between the two collectors. The apparatus can be used for rapid measurement of body temperatures or of temperature variations in buildings &c. when alarms or corrective devices can be activated if necessary. In the circuit which is D.C. supplied there are three switches S2A, S2B, S2C, which are moved together, and when on contact a, with on/off switches S1 closed, the apparatus is in use. With S2 switches on contact c, resistors R5 and R6 can be adjusted so that the voltage across the transistors can be maintained at a predetermined value during the battery life. With S2 switches on contact b, resistors R4, R8 and R11 are adjusted so that greatest accuracy of indication is obtained at a desired temperature. The embodiment of the device is portable and has external switches for S1, S2A, S2B, S2C, and for setting resistors R6 and R11. Resistors R4, R5 and R6 are preset. The thermistor R2 may be on a flexible probe for convenient use.
GB88360A 1960-01-11 1960-01-11 A stable circuit for direct visual reading of temperatures Expired GB863896A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB88360A GB863896A (en) 1960-01-11 1960-01-11 A stable circuit for direct visual reading of temperatures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB88360A GB863896A (en) 1960-01-11 1960-01-11 A stable circuit for direct visual reading of temperatures

Publications (1)

Publication Number Publication Date
GB863896A true GB863896A (en) 1961-03-29

Family

ID=9712155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB88360A Expired GB863896A (en) 1960-01-11 1960-01-11 A stable circuit for direct visual reading of temperatures

Country Status (1)

Country Link
GB (1) GB863896A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260114A (en) * 1962-02-19 1966-07-12 Jr Walter B Drolet Temperature indicating device
US3402378A (en) * 1965-09-10 1968-09-17 Aero Med Thermal Instr Company Electronic clinical thermometer and probe therefor
US3738174A (en) * 1972-03-01 1973-06-12 King Nutronics Corp Temperature calibration system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260114A (en) * 1962-02-19 1966-07-12 Jr Walter B Drolet Temperature indicating device
US3402378A (en) * 1965-09-10 1968-09-17 Aero Med Thermal Instr Company Electronic clinical thermometer and probe therefor
US3738174A (en) * 1972-03-01 1973-06-12 King Nutronics Corp Temperature calibration system

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