FR2412829A1 - Temp. rise detector for fire alarm - has differential amplifier triggering thyristor in lamp circuit when temp. unbalance in two semiconductor diodes occurs - Google Patents

Temp. rise detector for fire alarm - has differential amplifier triggering thyristor in lamp circuit when temp. unbalance in two semiconductor diodes occurs

Info

Publication number
FR2412829A1
FR2412829A1 FR7737113A FR7737113A FR2412829A1 FR 2412829 A1 FR2412829 A1 FR 2412829A1 FR 7737113 A FR7737113 A FR 7737113A FR 7737113 A FR7737113 A FR 7737113A FR 2412829 A1 FR2412829 A1 FR 2412829A1
Authority
FR
France
Prior art keywords
temp
diode
unbalance
differential amplifier
fire alarm
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
FR7737113A
Other languages
French (fr)
Other versions
FR2412829B1 (en
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.)
CACHERA DOMINIQUE
Original Assignee
CACHERA DOMINIQUE
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 CACHERA DOMINIQUE filed Critical CACHERA DOMINIQUE
Priority to FR7737113A priority Critical patent/FR2412829A1/en
Publication of FR2412829A1 publication Critical patent/FR2412829A1/en
Application granted granted Critical
Publication of FR2412829B1 publication Critical patent/FR2412829B1/fr
Granted 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
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
    • G01K3/10—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of time, e.g. reacting only to a quick change of temperature
    • 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
    • G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions

Landscapes

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

Abstract

Semi conductor junctions exhibit constant decrease in voltage as temperature increases. This effect is utilised in the fire detector where constant performance is required over large ambient temperature range. A diode (1) is coupled to thermal ambient environment under surveillance while a second diode (2) is isolated. The diode anodes are connected to a differential input amplifier (6) and a potentiometer (5) with a resistor (3, 4) network providing diode polarisation current to enable negative output to be set at amplifier output. Temperature unbalance in diodes causes positive output voltage from the amplifier t trigger a thyristor (8) to cause a lamp (9) to illuminate.
FR7737113A 1977-12-09 1977-12-09 Temp. rise detector for fire alarm - has differential amplifier triggering thyristor in lamp circuit when temp. unbalance in two semiconductor diodes occurs Granted FR2412829A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7737113A FR2412829A1 (en) 1977-12-09 1977-12-09 Temp. rise detector for fire alarm - has differential amplifier triggering thyristor in lamp circuit when temp. unbalance in two semiconductor diodes occurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7737113A FR2412829A1 (en) 1977-12-09 1977-12-09 Temp. rise detector for fire alarm - has differential amplifier triggering thyristor in lamp circuit when temp. unbalance in two semiconductor diodes occurs

Publications (2)

Publication Number Publication Date
FR2412829A1 true FR2412829A1 (en) 1979-07-20
FR2412829B1 FR2412829B1 (en) 1981-07-17

Family

ID=9198654

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7737113A Granted FR2412829A1 (en) 1977-12-09 1977-12-09 Temp. rise detector for fire alarm - has differential amplifier triggering thyristor in lamp circuit when temp. unbalance in two semiconductor diodes occurs

Country Status (1)

Country Link
FR (1) FR2412829A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161906A2 (en) * 1984-05-09 1985-11-21 COLE, Martin Terence Improvements relating to solid-state anemometers and temperature gauges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161906A2 (en) * 1984-05-09 1985-11-21 COLE, Martin Terence Improvements relating to solid-state anemometers and temperature gauges
EP0161906A3 (en) * 1984-05-09 1989-04-05 COLE, Martin Terence Improvements relating to solid-state anemometers and temperature gauges

Also Published As

Publication number Publication date
FR2412829B1 (en) 1981-07-17

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse