GB1013800A - Improvements in or relating to heat-sensitive devices - Google Patents

Improvements in or relating to heat-sensitive devices

Info

Publication number
GB1013800A
GB1013800A GB4756162A GB4756162A GB1013800A GB 1013800 A GB1013800 A GB 1013800A GB 4756162 A GB4756162 A GB 4756162A GB 4756162 A GB4756162 A GB 4756162A GB 1013800 A GB1013800 A GB 1013800A
Authority
GB
United Kingdom
Prior art keywords
wires
thermocouple
temperature
cable
forms
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
GB4756162A
Inventor
Francis John Adams
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.)
Pyrene Co Ltd
Original Assignee
Pyrene 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
Priority to DENDAT1251054D priority Critical patent/DE1251054B/de
Application filed by Pyrene Co Ltd filed Critical Pyrene Co Ltd
Priority to GB4756162A priority patent/GB1013800A/en
Priority to FR957247A priority patent/FR1377159A/en
Publication of GB1013800A publication Critical patent/GB1013800A/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
    • 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
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/04—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

1,013,800. Temperature alarms. PYRENE CO. Ltd. Dec. 17, 1963 [Dec. 17, 1962], No. 47561/62. Heading G4N. [Also in Divisions G1 and N1] Apparatus for detecting a fire comprises two wires forming the elements of a thermocouple, located in a cable whose dielectric is a powder having a high resistivity at low temperatures and a low resistivity at high temperatures, whereby a raised temperature anywhere along the cable forms a closed hot junction for the two wires, and a temperature-indicative voltage is developed between adjacent cold points of the two wires. The cable may be open at each end or formed into a closed loop (Fig. 1), the output signal being indicated on a meter or fed to a detector 9 where it operates an alarm at a predetermined temperature. The two conductors 4, 5 may be checked for continuity using A.C. isolated from the normal alarm circuit (Fig. 5, not shown) or D.C. of the opposite polarity (Fig. 3, not shown). The thermocouple wires may be chromel and alumel, and the dielectric 6 may be powdered magnesium oxide and sodium chloride or another alkali-metal halide. In a modification, an external stainless steel sheath 3 forms one element and a single alumel or chromel wire forms the other element of the thermocouple.
GB4756162A 1962-12-17 1962-12-17 Improvements in or relating to heat-sensitive devices Expired GB1013800A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DENDAT1251054D DE1251054B (en) 1962-12-17
GB4756162A GB1013800A (en) 1962-12-17 1962-12-17 Improvements in or relating to heat-sensitive devices
FR957247A FR1377159A (en) 1962-12-17 1963-12-16 Improvements to temperature-sensitive devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4756162A GB1013800A (en) 1962-12-17 1962-12-17 Improvements in or relating to heat-sensitive devices

Publications (1)

Publication Number Publication Date
GB1013800A true GB1013800A (en) 1965-12-22

Family

ID=10445427

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4756162A Expired GB1013800A (en) 1962-12-17 1962-12-17 Improvements in or relating to heat-sensitive devices

Country Status (2)

Country Link
DE (1) DE1251054B (en)
GB (1) GB1013800A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983001138A1 (en) * 1981-09-28 1983-03-31 Thermon Mfg Co Self-monitoring heat tracing system
US4490053A (en) * 1983-04-15 1984-12-25 Lockheed Missiles & Space Company, Inc. Temperature threshold detector
CN110384887A (en) * 2019-06-21 2019-10-29 山西新思备科技股份有限公司 A kind of mine hot spot monitoring early warning intelligent positioning fire extinguishing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983001138A1 (en) * 1981-09-28 1983-03-31 Thermon Mfg Co Self-monitoring heat tracing system
US4490053A (en) * 1983-04-15 1984-12-25 Lockheed Missiles & Space Company, Inc. Temperature threshold detector
CN110384887A (en) * 2019-06-21 2019-10-29 山西新思备科技股份有限公司 A kind of mine hot spot monitoring early warning intelligent positioning fire extinguishing system

Also Published As

Publication number Publication date
DE1251054B (en)

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