ES425125A1 - Fire detector and method employing assymetrical integrator - Google Patents

Fire detector and method employing assymetrical integrator

Info

Publication number
ES425125A1
ES425125A1 ES425125A ES425125A ES425125A1 ES 425125 A1 ES425125 A1 ES 425125A1 ES 425125 A ES425125 A ES 425125A ES 425125 A ES425125 A ES 425125A ES 425125 A1 ES425125 A1 ES 425125A1
Authority
ES
Spain
Prior art keywords
signal
integrator
threshold
discharge
integrated
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
ES425125A
Other languages
Spanish (es)
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 ES425125A1 publication Critical patent/ES425125A1/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

A fire indication signal, derived from a sensor, is tested whether it exceeds a first threshold level if it does, the signal is integrated in an integrator which has a slow, or long time constant to integrate a rising signal, but a short, rapid time constant to discharge, upon drop of the signal in one form, the integrator includes a diode in the integration circuit, so that it will discharge an integrating capacitor rapidly, upon drop in signal level exceeding the first threshold. When the integrated signal exceeds a second threshold, an alarm is given. Providing for rapid discharge of the integrated signal prevents false alarms resulting from repetitive short pulses exceeding a first threshold level which, however, do not persist.
ES425125A 1973-03-30 1974-03-30 Fire detector and method employing assymetrical integrator Expired ES425125A1 (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
ES425125A1 true ES425125A1 (en) 1976-06-16

Family

ID=4279532

Family Applications (1)

Application Number Title Priority Date Filing Date
ES425125A Expired ES425125A1 (en) 1973-03-30 1974-03-30 Fire detector and method employing assymetrical integrator

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
JPS49131099A (en) 1974-12-16
DK137099C (en) 1978-06-12
AT340807B (en) 1978-01-10
CH570016A5 (en) 1975-11-28
NO136383B (en) 1977-05-16
FR2223766A1 (en) 1974-10-25
DK137099B (en) 1978-01-16
FI55420B (en) 1979-03-30
ATA144074A (en) 1977-04-15
US3872449A (en) 1975-03-18
NL7403973A (en) 1974-10-02
AU6689674A (en) 1975-09-25
FR2223766B1 (en) 1978-12-01
JPS5619671B2 (en) 1981-05-08
DE2408374A1 (en) 1974-10-17
CA1063260A (en) 1979-09-25
SE389569B (en) 1976-11-08
ZA741754B (en) 1975-01-29
NO136383C (en) 1977-08-31
FI55420C (en) 1979-07-10
NO741081L (en) 1974-10-01
GB1430035A (en) 1976-03-31
IT1014554B (en) 1977-04-30
DE2408374B2 (en) 1978-06-01

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