US3564524A - Fire alarm system having a diode coupled checking circuit means - Google Patents

Fire alarm system having a diode coupled checking circuit means Download PDF

Info

Publication number
US3564524A
US3564524A US636174A US3564524DA US3564524A US 3564524 A US3564524 A US 3564524A US 636174 A US636174 A US 636174A US 3564524D A US3564524D A US 3564524DA US 3564524 A US3564524 A US 3564524A
Authority
US
United States
Prior art keywords
alarms
alarm
voltage
conductor
resistor
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 - Lifetime
Application number
US636174A
Other languages
English (en)
Inventor
Beat Walthard
Andreas Scheidweiler
Max Kuhn
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
Application granted granted Critical
Publication of US3564524A publication Critical patent/US3564524A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/14—Checking intermittently signalling or alarm systems checking the detection circuits
    • G08B29/145—Checking intermittently signalling or alarm systems checking the detection circuits of fire detection circuits

Definitions

  • a re alarm system including a plurality of tire alarms arranged in groups. Alarm-simulating conditions are produced in each tire alarm by an electric test signal, the response of each re alarm being sent to an evaluation device at a central signal station through a logic circuit coupling the re alarms together.
  • FIG. 1 illustrates a circuit diagram of a first embodiment of the invention in which the individual fire alarms have associated therewith diode means for coupling the individual vfire alarms to one another;
  • the ionization chamber 21 operates as a measuring chamber, whereas the ionization chamber 22 is used as a reference chamber.
  • ⁇ Chamber 22 can be replaced by a high-ohm resistor or an equivalent high ohm element.
  • a field-effect transistor 23 it is possible to use other semi-conductor devices or a diderent switch element with high-ohm input resistance or impedance, for instance a cold-cathode tube.
  • the voltage of source 300 appears across the Zener diodes 28 of the intact tire alarms, which Voltage of source 300 by definition is smaller than the Zener voltage. If all of the tire alarms of a group have properly responded then the conductor 29 is without current. On the other hand, a signal appearing at the conductor 29 means that one or more tire alarms have not responded.
  • the diode 68 is connected in parallel with the resistor 66.
  • the anode of the cold-cathode tube 56 is connected via a resistor 70 with the connection point of a series connection of a further capacitor '72 and a glow-discharge tube 74 disposed between the supply conductors 60 and 62.
  • Glow-discharge tube 74, capacitor 72 and resistors 58 and 70 form an impulse transmitter.
  • a current flows through the glow-discharge tube 74 which charges the capacitor 72 for such length of time until the voltage is dropped via the glow-discharge tube 74 to the extinguishing voltage, whereafter the capacitor 72 discharges via the resistor 58 and 70.
  • the voltage across the glow-discharge tube 74 again increases until it reaches the ignition voltage, and a new cycle is initiated.
  • the individual current surges can be registered at the secondary winding of a transformer 76 provided in the supply conductor 62 at the central station 78.
  • the cold-cathode tube 56 ignites because of an increase of the starter potential and draws a current through the resistor 58. In the event the operating voltage of the cold-cathode tube 56 is larger than the ignition voltage of the glow-discharge tube 74 then the oscillations of the associated impulse transmitter 74, 70, 72 stop.
  • the current surge during ignition of the cold-cathode tube 56 can be employed in known manner for triggering a relay ⁇ 80 or another alarm-transmitting device.
  • a ire alarm system comprising:
  • conductor means connecting said central signal sta- .tion with said plurality of fire alarms, the number of said conductors being independent of the number of said re alarms of each group;
  • said re alarms including means responsive to said electric test signal to produce alarm-simulating conditions;
  • a ire alarm system as claimed in claim 6, further including an additional voltage source, said additional voltage source being provided at said central signal station; resistance means connected between said additional voltage source and said common conductor, said resistance means limiting current flow to said visual indicating element of an actuated re alarm to a value less than the threshold value of said visual indicating element; and switch means tor short-circuiting said resistance means thus causing current to ilow to said indicating element having a value greater than said threshold value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)
US636174A 1966-05-09 1967-05-04 Fire alarm system having a diode coupled checking circuit means Expired - Lifetime US3564524A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH670366A CH473431A (de) 1966-05-09 1966-05-09 Verfahren zur Betriebsüberwachung von Feuermeldern

Publications (1)

Publication Number Publication Date
US3564524A true US3564524A (en) 1971-02-16

Family

ID=4313718

Family Applications (3)

Application Number Title Priority Date Filing Date
US636174A Expired - Lifetime US3564524A (en) 1966-05-09 1967-05-04 Fire alarm system having a diode coupled checking circuit means
US636173A Expired - Lifetime US3530450A (en) 1966-05-09 1967-05-04 Fire alarm systems with monitoring device for fire alarms connected in groups to a central station
US78127A Expired - Lifetime US3678510A (en) 1966-05-09 1970-10-05 Fire alarm systems equipped with circuit monitoring devices

Family Applications After (2)

Application Number Title Priority Date Filing Date
US636173A Expired - Lifetime US3530450A (en) 1966-05-09 1967-05-04 Fire alarm systems with monitoring device for fire alarms connected in groups to a central station
US78127A Expired - Lifetime US3678510A (en) 1966-05-09 1970-10-05 Fire alarm systems equipped with circuit monitoring devices

Country Status (11)

Country Link
US (3) US3564524A (de)
AT (2) AT278599B (de)
BE (1) BE698199A (de)
CH (1) CH473431A (de)
DE (1) DE1281321B (de)
DK (1) DK136839B (de)
ES (1) ES340611A1 (de)
GB (1) GB1140294A (de)
IL (1) IL27907A (de)
NL (1) NL162763C (de)
SE (2) SE365327B (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702468A (en) * 1970-08-10 1972-11-07 Nittan Co Ltd Fire alarming system
US3713128A (en) * 1970-08-07 1973-01-23 Systron Donner Corp Vault alarm system and method
US3717862A (en) * 1969-10-16 1973-02-20 Nittan Co Ltd Fire detecting system and testing means therefor
US3753258A (en) * 1970-03-31 1973-08-14 Nittan Co Ltd Fire alarming system
US3755799A (en) * 1972-07-31 1973-08-28 Pyronics Inc Ultraviolet flame detector
US3806921A (en) * 1972-04-18 1974-04-23 Aboyne Pty Ltd Detector device
US3842409A (en) * 1972-12-13 1974-10-15 Unitec Inc Ionization detector apparatus
US3866195A (en) * 1973-05-07 1975-02-11 Fire Alert Company Combustion product detector and method of calibrating
US3987423A (en) * 1975-12-22 1976-10-19 The United States Of America As Represented By The United States Energy Research And Development Administration Ionization-chamber smoke detector system
US4003039A (en) * 1973-07-19 1977-01-11 Pyrotector, Incorporated Optical fire detection system
US4097850A (en) * 1976-11-01 1978-06-27 Pittway Corporation Means for adjusting and for testing a detecting device
USRE30117E (en) * 1975-07-25 1979-10-16 Cerberus Ag Ionization-type fire or smoke sensing system
US4481502A (en) * 1982-03-26 1984-11-06 Dawson N Rick Central smoke alarm and annunciator
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system
US4916432A (en) * 1987-10-21 1990-04-10 Pittway Corporation Smoke and fire detection system communication
US5019805A (en) * 1989-02-03 1991-05-28 Flash-Alert Inc. Smoke detector with strobed visual alarm and remote alarm coupling
US20150294556A1 (en) * 2014-04-14 2015-10-15 Stephen D. Ainsworth Alarm System Testing Device

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA71780B (en) * 1970-03-31 1971-10-27 Nittan Co Ltd Fire alarming system
US3714433A (en) * 1970-09-28 1973-01-30 Nittan Co Ltd Ionization smoke detector
US3728703A (en) * 1970-10-12 1973-04-17 Edward Co Inc Fire detector stabilizer circuit
US3886534A (en) * 1973-01-08 1975-05-27 Polar Corp Security system
US3909815A (en) * 1973-06-01 1975-09-30 Gamma Electronic Detector for fumes and combustion gases
US3983548A (en) * 1975-02-19 1976-09-28 Tufts Howard L Fire detection system
US4168497A (en) * 1976-03-15 1979-09-18 Cerberus Ag Fire and smoke sensing system
DE2713280C3 (de) * 1977-03-25 1986-10-23 Esser Sicherheitstechnik GmbH & Co KG, 4040 Neuss Funktionsüberprüfbare Feuermelderanlage
DE2846310C3 (de) 1978-10-24 1982-01-28 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Brandmeldeeinrichtung für einen Raum großer Höhe und vorzugsweise großen Volumens, insbesondere eine La ger- oder Fabrikhalle
US4595914A (en) * 1983-04-11 1986-06-17 Pittway Corporation Self-testing combustion products detector
US5416391A (en) * 1992-07-31 1995-05-16 Correa; Paulo N. Electromechanical transduction of plasma pulses
US5233707A (en) * 1992-11-05 1993-08-10 Ladd Furniture Co., Inc. Stackable bunk beds forming a modular furniture assembly
US6501810B1 (en) 1998-10-13 2002-12-31 Agere Systems Inc. Fast frame synchronization
US5546074A (en) * 1993-08-19 1996-08-13 Sentrol, Inc. Smoke detector system with self-diagnostic capabilities and replaceable smoke intake canopy
DE102009060418A1 (de) * 2009-12-22 2011-06-30 Minimax GmbH & Co. KG, 23843 Prüfeinrichtung für Gefahrenmeldeanlagen
CN110533895A (zh) * 2019-09-29 2019-12-03 赛特威尔电子股份有限公司 一种火灾报警器的检查方法及火灾报警装置
CN112735110B (zh) * 2020-12-29 2022-06-07 深圳市安室智能有限公司 智能报警器测试系统、方法及装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667630A (en) * 1950-12-22 1954-01-26 Jorgensen Asger Lars Automatic fire alarm system
DE966199C (de) * 1952-12-13 1957-07-11 Telefonbau & Normalzeit Gmbh Pruefeinrichtung fuer Empfangszentralen von Meldeanlagen, insbesondere solchen, die mit Morsesicherheitsschaltung ausgeruestet sind
US2697824A (en) * 1953-06-26 1954-12-21 Petcar Res Corp Test circuit for flame detector systems
US2917731A (en) * 1958-05-23 1959-12-15 George H Rodgers Multiple indicator system with resettable warning signal
US3064245A (en) * 1959-05-25 1962-11-13 Jr John E Lindberg Heat detection device
US3192506A (en) * 1960-03-04 1965-06-29 Sargrove Electronics Ltd Electronic indicator system more particularly for use in mines
CH380594A (de) * 1960-11-02 1964-07-31 Securiton Ag Ionisations-Brandmeldeanlage
US3134970A (en) * 1961-05-31 1964-05-26 American District Telegraph Co Alarm system
US3438019A (en) * 1965-10-11 1969-04-08 Us Navy Data gathering system

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717862A (en) * 1969-10-16 1973-02-20 Nittan Co Ltd Fire detecting system and testing means therefor
US3753258A (en) * 1970-03-31 1973-08-14 Nittan Co Ltd Fire alarming system
US3713128A (en) * 1970-08-07 1973-01-23 Systron Donner Corp Vault alarm system and method
US3702468A (en) * 1970-08-10 1972-11-07 Nittan Co Ltd Fire alarming system
US3806921A (en) * 1972-04-18 1974-04-23 Aboyne Pty Ltd Detector device
US3755799A (en) * 1972-07-31 1973-08-28 Pyronics Inc Ultraviolet flame detector
US3842409A (en) * 1972-12-13 1974-10-15 Unitec Inc Ionization detector apparatus
US3866195A (en) * 1973-05-07 1975-02-11 Fire Alert Company Combustion product detector and method of calibrating
US4003039A (en) * 1973-07-19 1977-01-11 Pyrotector, Incorporated Optical fire detection system
USRE30117E (en) * 1975-07-25 1979-10-16 Cerberus Ag Ionization-type fire or smoke sensing system
US3987423A (en) * 1975-12-22 1976-10-19 The United States Of America As Represented By The United States Energy Research And Development Administration Ionization-chamber smoke detector system
US4097850A (en) * 1976-11-01 1978-06-27 Pittway Corporation Means for adjusting and for testing a detecting device
US4481502A (en) * 1982-03-26 1984-11-06 Dawson N Rick Central smoke alarm and annunciator
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system
US4916432A (en) * 1987-10-21 1990-04-10 Pittway Corporation Smoke and fire detection system communication
US5019805A (en) * 1989-02-03 1991-05-28 Flash-Alert Inc. Smoke detector with strobed visual alarm and remote alarm coupling
US20150294556A1 (en) * 2014-04-14 2015-10-15 Stephen D. Ainsworth Alarm System Testing Device
US9564045B2 (en) * 2014-04-14 2017-02-07 Stephen D. Ainsworth Alarm system testing device

Also Published As

Publication number Publication date
AT279431B (de) 1970-03-10
DE1281321B (de) 1968-10-24
DK136839C (de) 1978-05-16
ES340611A1 (es) 1968-06-01
AT278599B (de) 1970-02-10
US3530450A (en) 1970-09-22
NL6706275A (de) 1967-11-10
GB1140294A (en) 1969-01-15
NL162763C (nl) 1980-06-16
SE338527B (de) 1971-09-06
DK136839B (da) 1977-11-28
BE698199A (de) 1967-10-16
IL27907A (en) 1972-01-27
NL162763B (nl) 1980-01-15
CH473431A (de) 1969-05-31
SE365327B (de) 1974-03-18
US3678510A (en) 1972-07-18

Similar Documents

Publication Publication Date Title
US3564524A (en) Fire alarm system having a diode coupled checking circuit means
US3665461A (en) Apparatus for monitoring the conductors or lines of fire alarm installations
US4613848A (en) Multiple-zone intrusion detection system
US5155437A (en) Diagnostic device for gas turbine ignition system
US20080001726A1 (en) Building alarm system with synchronized strobes
US3603949A (en) Fire alarm installation
TWI332644B (en) Method and device for monitoring a detector line of a fire detection system for faults
JPH05240882A (ja) 絶縁された表示器を備えた障害回路検出器
US5523691A (en) Diagnostic device for gas turbine ignition system
US3676680A (en) Ionization fire alarm with insulation monitoring system
SE507139C2 (sv) Sätt och anordning för funktionskontroll av ljustända halvledarventilenheter i HVDC-ventilanläggningar
US6741164B1 (en) Building alarm system with synchronized strobes
CN102016946B (zh) 用于报告系统的功能监测的监测装置、报告系统以及用于监测的方法
JPH0430699B2 (de)
US3621262A (en) Alarm device gas discharge tube
US3491290A (en) Quick-response high voltage test system for locating and resolving faults in insulation of electrical cables
US2556363A (en) Alarm system with circuit integrity checking means
US3160866A (en) Electric alarm system
US4287509A (en) Sound and light signaling system
US3550111A (en) Security alarm system
US3553674A (en) Theft alarm system utilizing a bridge having a capacitive voltage divider
US3029420A (en) Network for monitoring alarm systems
US6281791B1 (en) Fire alarm system
US4506255A (en) Operation test circuit for fire detectors
US3500469A (en) Fault indicating system for a plurality of monitored devices