EP0033888A3 - Ionisation fire alarm device with malfunction signallization - Google Patents

Ionisation fire alarm device with malfunction signallization Download PDF

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Publication number
EP0033888A3
EP0033888A3 EP81100552A EP81100552A EP0033888A3 EP 0033888 A3 EP0033888 A3 EP 0033888A3 EP 81100552 A EP81100552 A EP 81100552A EP 81100552 A EP81100552 A EP 81100552A EP 0033888 A3 EP0033888 A3 EP 0033888A3
Authority
EP
European Patent Office
Prior art keywords
voltage
direct current
current supply
supply voltage
measuring chamber
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
EP81100552A
Other languages
German (de)
Other versions
EP0033888B1 (en
EP0033888A2 (en
EP0033888B2 (en
Inventor
Hartwig Beyersdorf
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.)
Individual
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6094144&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0033888(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to AT81100552T priority Critical patent/ATE11346T1/en
Publication of EP0033888A2 publication Critical patent/EP0033888A2/en
Publication of EP0033888A3 publication Critical patent/EP0033888A3/en
Publication of EP0033888B1 publication Critical patent/EP0033888B1/en
Application granted granted Critical
Publication of EP0033888B2 publication Critical patent/EP0033888B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Abstract

1. A fire alarm means comprising: at least one ionization fire detector (M), in particular a plurality of ionization fire detectors (M) connected parallel to each other to a detecting line (L; 10, 12) and including a measuring chamber (MK) accessible to ambient air and a reference chamber (RK) more closed against the access of ambient air, the series connection of said measuring chamber and of said reference chamber being connected to a direct current supply voltage; a smoke alarm circuit (62, 64, 66) being connected at its input side to the connection point (38) of said chambers (MK, RK) and generating a smoke alarm signal when smoke enters into said measuring chamber (MK); and a fault alarm circuit (46, 48, 50) being supplied by said direct current supply voltage, being connected at its input side to the connec tion point (38) of said chambers (MK, RK), and generating a fault alarm signal when the insula tion resistance of said measuring chamber (MK) drops below a predetermined threshold value; with the smoke alarm circuit (62, 62, 66) compris ing at its input side a field- effect transistor (90) connected with its control electrode to the con nection point (38) of said chambers (MK, RK), the drain electrode of said field-effect transistor being connected through a load resistor (92, 94) to that terminal (28) of said direct current supply voltage which said reference chamber (RK) is connected to; characterized in that for the additional emis sion of an alarm signal in case of faults influenc ing the voltage drop at said measuring chamber (MK) said fault alarm circuit (46, 48, 50) and said smoke alarm circuit (62, 64, 66) are, with respect to the input thereshold voltage necessary for their actuation and being measured between their inputs and a terminal (28, 30) of said direct current supply voltage, at least approximately voltage- independent with respect to said direct current supply voltage, that the voltage source (14) pro viding said direct current supply voltage is switch able to a voltage which is increased with respect to the nominal value of said direct current supply voltage, and that the threshold voltage of said self-locking field-effect transistor (90) is such that the voltage occuring at the control path of said field-effect transistor (90) due to the switching to the increased voltage exceeds the threshold volt age only when said measuring chamber (MK), due to the contamination of the radiation source ionizing the measuring chamber shows an inter nal resistance increased with respect to the so far undisturbed status, and that in dependency from the switching to the increased voltage the trans mission of the smoke alarm signal possibly generated by said smoke alarm circuit (62, 64, 66) to an evaluating circuit (26) is suppressed and a fault alarm signal is generated instead thereof and transmitted to the evaluating circuit (26).
EP81100552A 1980-02-08 1981-01-26 Ionisation fire alarm device with malfunction signalization Expired - Lifetime EP0033888B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100552T ATE11346T1 (en) 1980-02-08 1981-01-26 IONIZATION FIRE DETECTION DEVICE WITH FAULT SIGNALING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3004753A DE3004753C2 (en) 1980-02-08 1980-02-08 Fire alarm device
DE3004753 1980-02-08

Publications (4)

Publication Number Publication Date
EP0033888A2 EP0033888A2 (en) 1981-08-19
EP0033888A3 true EP0033888A3 (en) 1982-11-03
EP0033888B1 EP0033888B1 (en) 1985-01-16
EP0033888B2 EP0033888B2 (en) 1991-02-06

Family

ID=6094144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100552A Expired - Lifetime EP0033888B2 (en) 1980-02-08 1981-01-26 Ionisation fire alarm device with malfunction signalization

Country Status (4)

Country Link
EP (1) EP0033888B2 (en)
AT (1) ATE11346T1 (en)
DE (2) DE3004753C2 (en)
FR (1) FR2475768A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189399A (en) * 1989-02-18 1993-02-23 Hartwig Beyersdorf Method of operating an ionization smoke alarm and ionization smoke alarm
DE3904979A1 (en) * 1989-02-18 1990-08-23 Beyersdorf Hartwig METHOD FOR OPERATING AN IONIZATION SMOKE DETECTOR AND IONIZATION SMOKE DETECTOR
CN106741986B (en) * 2016-12-21 2023-08-29 太原航空仪表有限公司 Rod vibrator with driving function
CN114325383A (en) * 2021-12-20 2022-04-12 中国人民解放军总参谋部第六十研究所 Brushless motor winding fault detection system and method for unmanned helicopter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795904A (en) * 1970-05-16 1974-03-05 Preussag Ag Feuerschutz Fire alarm with ionization chamber
DE2604673A1 (en) * 1974-01-07 1976-08-26 Pittway Corp FIRE DETECTOR
US4138664A (en) * 1976-12-14 1979-02-06 Pittway Corporation Warning device
GB2013383A (en) * 1978-01-26 1979-08-08 Pittway Corp Warning devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH497755A (en) * 1969-06-24 1970-10-15 Cerberus Ag Ionization fire alarms
CH586941A5 (en) * 1975-07-25 1977-04-15 Cerberus Ag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795904A (en) * 1970-05-16 1974-03-05 Preussag Ag Feuerschutz Fire alarm with ionization chamber
DE2604673A1 (en) * 1974-01-07 1976-08-26 Pittway Corp FIRE DETECTOR
US4138664A (en) * 1976-12-14 1979-02-06 Pittway Corporation Warning device
GB2013383A (en) * 1978-01-26 1979-08-08 Pittway Corp Warning devices

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELECTRONIQUE & APPLICATIONS INDUSTRIELLES, Nr. 255, 15. Juni 1978, Seiten 67-68, Paris, FR. *

Also Published As

Publication number Publication date
DE3168215D1 (en) 1985-02-28
FR2475768A1 (en) 1981-08-14
EP0033888B1 (en) 1985-01-16
DE3004753C2 (en) 1983-12-22
DE3004753A1 (en) 1981-08-27
FR2475768B1 (en) 1983-09-23
EP0033888A2 (en) 1981-08-19
EP0033888B2 (en) 1991-02-06
ATE11346T1 (en) 1985-02-15

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