GB1430035A - Method of obtaining fire alarm signal and fire alarm apparatus - Google Patents

Method of obtaining fire alarm signal and fire alarm apparatus

Info

Publication number
GB1430035A
GB1430035A GB1412074A GB1412074A GB1430035A GB 1430035 A GB1430035 A GB 1430035A GB 1412074 A GB1412074 A GB 1412074A GB 1412074 A GB1412074 A GB 1412074A GB 1430035 A GB1430035 A GB 1430035A
Authority
GB
United Kingdom
Prior art keywords
detector
fire alarm
threshold
fire
march
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
GB1412074A
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.)
Cerberus AG
Original Assignee
Cerberus AG
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 Cerberus AG filed Critical Cerberus AG
Publication of GB1430035A publication Critical patent/GB1430035A/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
    • G08B17/10—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

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Alarm Systems (AREA)

Abstract

1430035 Fire alarms CERBERUS AG 29 March 1974 [30 March 1973] 14120/74 Heading G4N [Also in Division G1] A fire alarm apparatus comprises a sensor 1, 2, responsive to smoke, combustion gases or other indicia of fire, a first threshold detector 6, an integrator I whose discharge time constant is smaller than its charge time constant, and a second threshold detector 10. In operation, when the output of sensor 1, 2 exceeds the threshold of detector 6, a capacitor 8 is charged via a resistor 9 which charge is discharged at a faster rate via a diode 11 and a resistor 7 when the output of detector 6 decreases or falls to zero. In the presence of a continuous fire condition, the capacitor 8 is charged to a value exceeding the threshold of a second detector for triggering an alarm. The apparatus is thus insensitive to sequential smoke pulses not originating from a real fire condition.
GB1412074A 1973-03-30 1974-03-29 Method of obtaining fire alarm signal and fire alarm apparatus Expired GB1430035A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH462173A CH570016A5 (en) 1973-03-30 1973-03-30

Publications (1)

Publication Number Publication Date
GB1430035A true GB1430035A (en) 1976-03-31

Family

ID=4279532

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1412074A Expired GB1430035A (en) 1973-03-30 1974-03-29 Method of obtaining fire alarm signal and fire alarm apparatus

Country Status (17)

Country Link
US (1) US3872449A (en)
JP (1) JPS5619671B2 (en)
AT (1) AT340807B (en)
BE (1) BE812331A (en)
CA (1) CA1063260A (en)
CH (1) CH570016A5 (en)
DE (1) DE2408374B2 (en)
DK (1) DK137099B (en)
ES (1) ES425125A1 (en)
FI (1) FI55420C (en)
FR (1) FR2223766B1 (en)
GB (1) GB1430035A (en)
IT (1) IT1014554B (en)
NL (1) NL7403973A (en)
NO (1) NO136383C (en)
SE (1) SE389569B (en)
ZA (1) ZA741754B (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512635B2 (en) * 1972-07-26 1980-04-03
CH576175A5 (en) * 1974-12-19 1976-05-31 Cerberus Ag
JPS5737265Y2 (en) * 1976-07-07 1982-08-17
US4131888A (en) * 1976-08-18 1978-12-26 American District Telegraph Company Dual projected-beam smoke detector
US4091363A (en) * 1977-01-03 1978-05-23 Pittway Corporation Self-contained fire detector with interconnection circuitry
FR2386874A1 (en) * 1977-04-08 1978-11-03 Gamma Electronic IONIZATION SMOKE DETECTOR ASSOCIATED WITH AN ELECTRONIC VELOCIMETRIC MEASUREMENT CIRCUIT
US4222046A (en) * 1978-07-31 1980-09-09 Honeywell Inc. Abnormal condition responsive means with periodic high sensitivity
US4250500A (en) * 1979-10-22 1981-02-10 Rca Corporation Smoke detector
CA1148279A (en) * 1979-12-14 1983-06-14 Andreas Scheidweiler Ionization smoke detector with increased operational reliability
DE3127324A1 (en) * 1981-07-10 1983-01-27 Siemens AG, 1000 Berlin und 8000 München METHOD AND ARRANGEMENT FOR INCREASING THE SENSITIVITY AND EMERGENCY SAFETY IN A DANGER, IN PARTICULAR FIRE DETECTING SYSTEM
US4539488A (en) * 1981-11-30 1985-09-03 Zenith Electronics Corporation Pulse wave to parabola wave converter
JPS60126798A (en) * 1983-12-13 1985-07-06 ニッタン株式会社 Environmental abnormality detector
US5019805A (en) * 1989-02-03 1991-05-28 Flash-Alert Inc. Smoke detector with strobed visual alarm and remote alarm coupling
US6188318B1 (en) 1999-06-29 2001-02-13 Pittway Corp. Dual-technology intrusion detector with pet immunity
CN102455288B (en) * 2010-10-15 2014-10-15 西门子公司 Apparatus for carrying out calibration on photoelectric signal path of sensor device through online signal level monitoring
DE102014019773B4 (en) 2014-12-17 2023-12-07 Elmos Semiconductor Se Device and method for distinguishing between solid objects, cooking fumes and smoke using the display of a mobile telephone
DE102014019172B4 (en) 2014-12-17 2023-12-07 Elmos Semiconductor Se Device and method for distinguishing between solid objects, cooking fumes and smoke using a compensating optical measuring system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735007A (en) * 1956-02-14 Time-base generator
US2811711A (en) * 1951-05-19 1957-10-29 Electronics Corp America Fire method and apparatus
US3582676A (en) * 1968-09-24 1971-06-01 Bendix Corp Pulse length normalizing and short pulse eliminating circuit
US3531692A (en) * 1969-03-03 1970-09-29 Combustion Eng Activity detector having increased accuracy of response
JPS482587U (en) * 1971-05-25 1973-01-12

Also Published As

Publication number Publication date
BE812331A (en) 1974-07-01
CA1063260A (en) 1979-09-25
DK137099B (en) 1978-01-16
ATA144074A (en) 1977-04-15
SE389569B (en) 1976-11-08
JPS5619671B2 (en) 1981-05-08
DK137099C (en) 1978-06-12
AT340807B (en) 1978-01-10
FI55420B (en) 1979-03-30
FR2223766A1 (en) 1974-10-25
AU6689674A (en) 1975-09-25
IT1014554B (en) 1977-04-30
NO741081L (en) 1974-10-01
DE2408374A1 (en) 1974-10-17
NO136383B (en) 1977-05-16
ES425125A1 (en) 1976-06-16
NO136383C (en) 1977-08-31
FR2223766B1 (en) 1978-12-01
CH570016A5 (en) 1975-11-28
US3872449A (en) 1975-03-18
ZA741754B (en) 1975-01-29
JPS49131099A (en) 1974-12-16
DE2408374B2 (en) 1978-06-01
FI55420C (en) 1979-07-10
NL7403973A (en) 1974-10-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee