GB1131190A - Improvements in or relating to heat responsive apparatus - Google Patents

Improvements in or relating to heat responsive apparatus

Info

Publication number
GB1131190A
GB1131190A GB802667A GB802667A GB1131190A GB 1131190 A GB1131190 A GB 1131190A GB 802667 A GB802667 A GB 802667A GB 802667 A GB802667 A GB 802667A GB 1131190 A GB1131190 A GB 1131190A
Authority
GB
United Kingdom
Prior art keywords
temperature
thermistor
thermistors
alarm
resistor
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
GB802667A
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.)
Pyrotector Inc
Original Assignee
Pyrotector Inc
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 Pyrotector Inc filed Critical Pyrotector Inc
Publication of GB1131190A publication Critical patent/GB1131190A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch

Abstract

1,131,190. Temperature alarms. PYROTECTOR Inc. 20 Feb., 1967 [4 April, 1966], No. 8026/67. Heading G4N. Heat-sensing apparatus for detecting and responding to different predetermined temperatures in respective ones of a plurality of locations under surveillance comprises a plurality of temperature sensing devices such as thermistors 16, 16a, 16b which are responsive to a change in temperature, each thermistor being connected in series with a resistor 18, 18a or 18b through a common junction 20, 20a, 20b, and a diode 22, 22a or 22b connected between each of the common junctions and the alarm relay coil through an amplifier 12. A rise in temperature in any one of the thermistors reduces its resistance and increases the voltage across the corresponding resistor 18. When the increase is sufficient, the corresponding diode conducts and amplifier 12 operates alarm relay 10. Resistor 26 is provided so that the voltage required at the base of transistor T1 to actuate the alarm may be adjusted. The rise in temperature of any of the thermistors 16, 16a, 16b which is necessary to effect the predetermined charge in applied voltage is determined by the value of resistance 18, 18a or 18b associated with each thermistor. At least one of the resistances is adjustable so that the temperature at which each thermistor actuates the alarm may be different from that of each other thermistor.
GB802667A 1966-04-04 1967-02-20 Improvements in or relating to heat responsive apparatus Expired GB1131190A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US53967766A 1966-04-04 1966-04-04

Publications (1)

Publication Number Publication Date
GB1131190A true GB1131190A (en) 1968-10-23

Family

ID=24152202

Family Applications (1)

Application Number Title Priority Date Filing Date
GB802667A Expired GB1131190A (en) 1966-04-04 1967-02-20 Improvements in or relating to heat responsive apparatus

Country Status (2)

Country Link
FR (1) FR1510480A (en)
GB (1) GB1131190A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2754746A1 (en) * 1977-12-08 1979-06-13 Preussag Ag Feuerschutz Centralised alarm system with built-in switching facility - identifies break or short circuit from alarm condition by using change in resistance value
DE2846310A1 (en) 1978-10-24 1980-04-30 Preussag Ag Feuerschutz Fire alarm system for factory or warehouse - has each detector incorporated in air duct with air intakes at half of ceiling height
DE2857333A1 (en) * 1978-10-24 1980-05-14 Preussag Ag Feuerschutz REPORTING DEVICE
FR2464465A1 (en) * 1979-08-29 1981-03-06 Loher Gmbh TEMPERATURE CONTROL DEVICE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2754746A1 (en) * 1977-12-08 1979-06-13 Preussag Ag Feuerschutz Centralised alarm system with built-in switching facility - identifies break or short circuit from alarm condition by using change in resistance value
DE2846310A1 (en) 1978-10-24 1980-04-30 Preussag Ag Feuerschutz Fire alarm system for factory or warehouse - has each detector incorporated in air duct with air intakes at half of ceiling height
DE2857333A1 (en) * 1978-10-24 1980-05-14 Preussag Ag Feuerschutz REPORTING DEVICE
FR2464465A1 (en) * 1979-08-29 1981-03-06 Loher Gmbh TEMPERATURE CONTROL DEVICE

Also Published As

Publication number Publication date
FR1510480A (en) 1968-01-19

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