GB1108605A - Improvements in and relating to temperature-sensing means - Google Patents

Improvements in and relating to temperature-sensing means

Info

Publication number
GB1108605A
GB1108605A GB3242/65A GB324265A GB1108605A GB 1108605 A GB1108605 A GB 1108605A GB 3242/65 A GB3242/65 A GB 3242/65A GB 324265 A GB324265 A GB 324265A GB 1108605 A GB1108605 A GB 1108605A
Authority
GB
United Kingdom
Prior art keywords
voltage
resistors
resistor
series
temperature
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
GB3242/65A
Inventor
Peter Hogarth Mcloughlin
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.)
International Research and Development Co Ltd
Original Assignee
International Research and Development 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 International Research and Development Co Ltd filed Critical International Research and Development Co Ltd
Priority to GB3242/65A priority Critical patent/GB1108605A/en
Publication of GB1108605A publication Critical patent/GB1108605A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/1928—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperature of one space

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

1,108,605. Temperature alarms. INTERNATIONAL RESEARCH DEVELOPMENT CO. Ltd. 18 Jan., 1966 [25 Jan., 1965], No. 3242/65. Heading G4N. [Also in Division G1] A positive temperature coefficient resistor or a series thereof, 1, 2, 3, 4, 5, Fig. 5, is supplied with a constant current from a source 6, and when one or more of the resistors undergoes a sharp increase in resistivity due to thermal runaway upon attainment of a particular temperature, a voltage sensing circuit, responsive to rate of change of voltage across the resistor or the series of resistors, operates an indicator and alarm. The voltage sensing circuit is connected at 7, 8 across the series of resistors 1, 2, 3, 4, 5 and the resistor which has abruptly increased in value is identified by arranging a voltage limiting device such as a Zener diode across each resistor, each diode defining a different limiting voltage, and noting the magnitude of the increase in voltage registered by the indicator. The fact that the alarm is operated by a rate of change of voltage ensures that it is not erroneously operated by large but slowly occurring changes in indicated voltage arising from small changes in all the resistors due to slight variations in ambient temperature.
GB3242/65A 1965-01-25 1965-01-25 Improvements in and relating to temperature-sensing means Expired GB1108605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3242/65A GB1108605A (en) 1965-01-25 1965-01-25 Improvements in and relating to temperature-sensing means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3242/65A GB1108605A (en) 1965-01-25 1965-01-25 Improvements in and relating to temperature-sensing means

Publications (1)

Publication Number Publication Date
GB1108605A true GB1108605A (en) 1968-04-03

Family

ID=9754636

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3242/65A Expired GB1108605A (en) 1965-01-25 1965-01-25 Improvements in and relating to temperature-sensing means

Country Status (1)

Country Link
GB (1) GB1108605A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145863A (en) * 1983-08-08 1985-04-03 Pittway Corp Monitoring system
DE4312395A1 (en) * 1993-04-16 1994-10-20 Gsf Forschungszentrum Umwelt Process for increasing the measuring accuracy of resistance thermometers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145863A (en) * 1983-08-08 1985-04-03 Pittway Corp Monitoring system
DE4312395A1 (en) * 1993-04-16 1994-10-20 Gsf Forschungszentrum Umwelt Process for increasing the measuring accuracy of resistance thermometers

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