GB1319615A - Apparatus for supervising the continuity of leads in alarm installations - Google Patents

Apparatus for supervising the continuity of leads in alarm installations

Info

Publication number
GB1319615A
GB1319615A GB4420970A GB4420970A GB1319615A GB 1319615 A GB1319615 A GB 1319615A GB 4420970 A GB4420970 A GB 4420970A GB 4420970 A GB4420970 A GB 4420970A GB 1319615 A GB1319615 A GB 1319615A
Authority
GB
United Kingdom
Prior art keywords
line
transistor
control panel
alarm
signal
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
GB4420970A
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 GB1319615A publication Critical patent/GB1319615A/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
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • 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
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)

Abstract

1319615 Alarm systems CERBERUS AG 16 Sept 1970 [16 Sept 1969] 44209/70 Heading G4N In an alarm system having a plurality of condition-sensing devices 4 connected to a central control panel 1 by means of a common line 5, 6, said devices 4 responding to an unwanted condition by providing a D.C. signal from a voltage supplied by the control panel 1, a line-terminating unit 7 is included to provide an A.C. signal to the control panel 1 so as to check continuity of the line 5. 6. The circuit shown is suitable for use in the control panel of a central station in a fire alarm system which comprises a plurality of sensors 4 connected across a line 5, 6 and having a oscillator or pulse generator connected to the remote end of the line so as to provide test signals, in the form of current impulses, indicative of continuity of the line 5, 6. The circuit is powered at 39, 40, by D.C. from a mains-driven power unit and comprises a current limiting voltage stabilizer 41. In the event of one or more sensors 4 operating, transistor 42 is turned on, transmitting a signal to an alarm store 11 which, after 0À2 sees., periodically reduces the output of voltage stabilizer 41 so that an indicator lamp on the sensor begins to blink. The current impulses obtained from the test termination element 7 at the remote end of the line are however too short to operate the alarm store 11 but they are rectified at 46 and charge capacitor 48 such that if they persist for more than 1 sec., transistor 51 is turned on so as to prevent a fault indicator 52 from operating. In the event of a line fault, the test pulses will be absent so that transistor 51 becomes turned off and allows the fault indicator 52 to operate. Test signal generators may take the form of a neon sawtooth oscillator (Fig. 2, not shown), a transistor or unijunction transistor pulse generator (Figs. 3, 4, not shown). Fire sensors 1 may comprise ionization chambers, photo-sensitive elements, temperature-sensitive resistors, bi-metal contact devices or thermo-couples.
GB4420970A 1969-09-16 1970-09-16 Apparatus for supervising the continuity of leads in alarm installations Expired GB1319615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1398169A CH495022A (en) 1969-09-16 1969-09-16 Fire alarm system with a device for line monitoring

Publications (1)

Publication Number Publication Date
GB1319615A true GB1319615A (en) 1973-06-06

Family

ID=4396930

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4420970A Expired GB1319615A (en) 1969-09-16 1970-09-16 Apparatus for supervising the continuity of leads in alarm installations

Country Status (9)

Country Link
US (1) US3665461A (en)
JP (1) JPS4822038B1 (en)
CA (1) CA957745A (en)
CH (1) CH495022A (en)
DE (1) DE2038795C3 (en)
FR (1) FR2061175A5 (en)
GB (1) GB1319615A (en)
SE (1) SE359180B (en)
ZA (1) ZA706196B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6259363B1 (en) 1998-05-20 2001-07-10 Apollo Fire Detectors Limited Detector removal signalling device

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US3980995A (en) * 1974-12-17 1976-09-14 Tulio Vasquez Alarm system
US4103299A (en) * 1976-10-12 1978-07-25 Cutler-Hammer, Inc. Two-wire pilot device solid state control system
DE2713280C3 (en) * 1977-03-25 1986-10-23 Esser Sicherheitstechnik GmbH & Co KG, 4040 Neuss Function-testable fire alarm system
US4141007A (en) * 1977-04-22 1979-02-20 Kavasilios Michael A Central alarm conditioning detecting and alerting system
US4191946A (en) * 1977-10-20 1980-03-04 Gonzalez Raymond J Warning apparatus with a line integrity supervisory circuit
JPS595955B2 (en) * 1979-07-27 1984-02-08 ホーチキ株式会社 fire alarm
US4385287A (en) * 1979-12-07 1983-05-24 Securicor Granley Systems Limited Multiple alarm condition detection and signalling
DE3165143D1 (en) * 1980-02-07 1984-09-06 Schlumberger Electronics Uk Electricity meters
DE3122474A1 (en) * 1981-06-05 1982-12-23 Hekatron GmbH, 7811 Sulzburg "CIRCUIT ARRANGEMENT FOR TRANSMITTING MEASURED VALUES, IN PARTICULAR IN A FIRE DETECTING SYSTEM, TO A CENTRAL UNIT"
EP0066879A1 (en) * 1981-06-05 1982-12-15 Hekatron GmbH Circuit arrangement for the transmission of measured values to a central station, especially for a fire signalling system
JPS58103718U (en) * 1981-12-30 1983-07-14 松下電器産業株式会社 packaging box
US4481502A (en) * 1982-03-26 1984-11-06 Dawson N Rick Central smoke alarm and annunciator
US4512033A (en) * 1982-11-29 1985-04-16 C-Cor Labs, Inc. Remote level adjustment system for use in a multi-terminal communications system
US4648123A (en) * 1982-11-29 1987-03-03 C-Cor Labs, Inc. Remote level measurement system for use in a multi-terminal communications system
US4538137A (en) * 1983-01-20 1985-08-27 Nittan Company, Limited Fire detector
GB2151058A (en) * 1983-12-08 1985-07-10 Sound Diffusion Plc Fire alarm systems with incipient hyper-sensitivity monitoring
GB8429487D0 (en) * 1984-11-22 1985-01-03 Thorn Emi Automation Ltd Electrical apparatus
US5138562A (en) * 1988-04-14 1992-08-11 Fike Corporation Environmental protection system useful for the fire detection and suppression
US4977527A (en) * 1988-04-14 1990-12-11 Fike Corporation Threshold compensation and calibration in distributed environmental detection system for fire detection and suppression
US5008840A (en) * 1988-05-27 1991-04-16 Napco Security Systems, Inc. Multi-zone microprocessor fire control apparatus
US4991123A (en) * 1989-01-06 1991-02-05 Cerberus A.G. Alarm system
US5822544A (en) * 1990-07-27 1998-10-13 Executone Information Systems, Inc. Patient care and communication system
US5594786A (en) * 1990-07-27 1997-01-14 Executone Information Systems, Inc. Patient care and communication system
US6958706B2 (en) * 1990-07-27 2005-10-25 Hill-Rom Services, Inc. Patient care and communication system
JPH06130124A (en) * 1992-10-20 1994-05-13 Mitsubishi Electric Corp Test circuit of signal input circuit having threshold value
US6163263A (en) * 1999-02-02 2000-12-19 Pittway Corporation Circuitry for electrical device in multi-device communications system
US6567001B1 (en) 2000-02-24 2003-05-20 Simplex Time Recorder Co. Fire control panel monitoring for degradation of wiring integrity during alarm state
US6791453B1 (en) * 2000-08-11 2004-09-14 Walter Kidde Portable Equipment, Inc. Communication protocol for interconnected hazardous condition detectors, and system employing same
US7126487B2 (en) * 2004-10-15 2006-10-24 Ranco Incorporated Of Delaware Circuit and method for prioritization of hazardous condition messages for interconnected hazardous condition detectors
US7333010B2 (en) * 2005-03-25 2008-02-19 Simplexgrinnell Lp Method and apparatus for verifying operation of notification appliances during low input voltage condition
EP1777671A1 (en) * 2005-10-19 2007-04-25 Honeywell International, Inc. Monitoring of alarm system wiring
US8063763B2 (en) 2008-11-25 2011-11-22 Simplexgrinnell Lp System for testing NAC operability using reduced operating voltage
ATE517410T1 (en) * 2006-05-11 2011-08-15 Siemens Ag METHOD AND DEVICE FOR MONITORING A DETECTION LINE OF A FIRE ALARM SYSTEM FOR FAULTS
DE102008003799B4 (en) * 2008-01-10 2021-06-10 Robert Bosch Gmbh Monitoring device for a reporting system, reporting system and method for monitoring the reporting system
DE102008015999B4 (en) * 2008-03-27 2011-04-21 Novar Gmbh Transmission path - Test method for a hazard alarm system
DE102008028631B4 (en) * 2008-06-18 2011-06-22 GEZE GmbH, 71229 Line monitoring of smoke switches
FR2934401B1 (en) * 2008-07-28 2010-08-13 Legrand France IMPROVED SAFETY INSTALLATION AND CORRESPONDING MONITORING METHOD
US8232884B2 (en) * 2009-04-24 2012-07-31 Gentex Corporation Carbon monoxide and smoke detectors having distinct alarm indications and a test button that indicates improper operation
US8836532B2 (en) 2009-07-16 2014-09-16 Gentex Corporation Notification appliance and method thereof
DE102011002926B4 (en) * 2011-01-20 2014-11-06 Geze Gmbh Line monitoring of smoke switches
DE102016200913A1 (en) 2016-01-22 2017-07-27 Hekatron Vertriebs Gmbh Device for line monitoring of hazard detectors and locking devices
DE102016200914A1 (en) 2016-01-22 2017-07-27 Hekatron Vertriebs Gmbh Device for line monitoring at a locking device of fire doors with smoke switches
DE102018112299B4 (en) 2018-05-23 2020-12-03 Minimax Gmbh & Co. Kg Device, method and control module for monitoring a two-wire line
US10832557B2 (en) * 2019-04-11 2020-11-10 Honeywell International Inc. Operating a fire alarm system
CN112242049A (en) 2019-07-19 2021-01-19 开利公司 State detection of alarm sounding component

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US3072827A (en) * 1957-04-01 1963-01-08 Joy Mfg Co Circuit protecting device
US3192506A (en) * 1960-03-04 1965-06-29 Sargrove Electronics Ltd Electronic indicator system more particularly for use in mines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6259363B1 (en) 1998-05-20 2001-07-10 Apollo Fire Detectors Limited Detector removal signalling device

Also Published As

Publication number Publication date
JPS4822038B1 (en) 1973-07-03
DE2038795B2 (en) 1973-05-03
US3665461A (en) 1972-05-23
FR2061175A5 (en) 1971-06-18
ZA706196B (en) 1971-05-27
CA957745A (en) 1974-11-12
DE2038795C3 (en) 1973-11-29
CH495022A (en) 1970-08-15
SE359180B (en) 1973-08-20
DE2038795A1 (en) 1971-04-08

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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