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GB1183229A - Improvements in or relating to Control Circuits for Alarm Devices - Google Patents

Improvements in or relating to Control Circuits for Alarm Devices

Info

Publication number
GB1183229A
GB1183229A GB50418/67A GB5041867A GB1183229A GB 1183229 A GB1183229 A GB 1183229A GB 50418/67 A GB50418/67 A GB 50418/67A GB 5041867 A GB5041867 A GB 5041867A GB 1183229 A GB1183229 A GB 1183229A
Authority
GB
United Kingdom
Prior art keywords
relay
capacitor
lamp
supply
failure
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
GB50418/67A
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.)
Pyrotector Inc
Original Assignee
Pyrotector Inc
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 Pyrotector Inc filed Critical Pyrotector Inc
Publication of GB1183229A publication Critical patent/GB1183229A/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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • 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
    • G08B17/113—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Business, Economics & Management (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1,183,229. Fire alarms; lamp failure alarms. PYROTECTOR Inc. 6 Nov., 1967 [7 Nov., 1966], No. 50418/67. Headings G4F and G4N. In an alarm system, a relay R1 is normally energized by half cycles of an A.C. supply, a capacitor F1 supplying current during the missing half cycles; means are provided responsive to failure of a component in the system to inhibit the current from the capacitor F1 so that the relay emits an audible signal. As shown in Fig. 3, relay R1 is normally energized by A.C. supply E, half-wave rectified at D2, the current during the missing half cycles being supplied by capacitor F1. Light from a lamp 14 in a labyrinth (Fig. 1, not shown) is reflected by smoke on to a CdS cell C1, reducing its resistance and allowing a neon tube B1 to strike, illuminating a photo-resistive cell C2 which connects an opposing rectifier D1 to the relay R1; capacitor F1 by-passes the non-rectified full-wave current across the relay R1 so that it becomes de-energized, initiating an alarm A. Supply voltage compensation.-The standing voltage across the photo-resistive cell C1. is is stabilized by neon tubes B2, B3. Neon tubes B4, B5 are connected to the lower end of the neon tube B1 so as to compensate for the change insensitivity of the circuit due to variation in brightness of the main lamp 14 in the event of supply voltage fluctuation. Lamp failure alarm.-Failure of the main lamp 14 results in photo-resistive cell C3 becoming high resistance so that capacitor F1 becomes ineffective, hence relay R1 will chatter due to the unsmoothed half-wave rectified supply.
GB50418/67A 1966-11-07 1967-11-06 Improvements in or relating to Control Circuits for Alarm Devices Expired GB1183229A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US59261766A 1966-11-07 1966-11-07

Publications (1)

Publication Number Publication Date
GB1183229A true GB1183229A (en) 1970-03-04

Family

ID=24371402

Family Applications (2)

Application Number Title Priority Date Filing Date
GB50418/67A Expired GB1183229A (en) 1966-11-07 1967-11-06 Improvements in or relating to Control Circuits for Alarm Devices
GB47341/69A Expired GB1183230A (en) 1966-11-07 1967-11-06 Improvements in or relating to Control Circuits for Alarm Devices

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB47341/69A Expired GB1183230A (en) 1966-11-07 1967-11-06 Improvements in or relating to Control Circuits for Alarm Devices

Country Status (3)

Country Link
US (1) US3461443A (en)
DE (1) DE1566721B1 (en)
GB (2) GB1183229A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879718A (en) * 1970-09-16 1975-04-22 Gordon A Roberts Smoke detection unit with dual purpose alarm circuit
US3688297A (en) * 1970-10-27 1972-08-29 Gen Motors Corp Lights out detector for providing a continuous indication of the failure of lamps which are illuminated intermittently or have intermittent failures
US3678499A (en) * 1970-10-27 1972-07-18 Gen Electric Electronic digital clock power failure indicator
US3731105A (en) * 1972-05-19 1973-05-01 Litton Business Systems Inc Arc suppressor for dielectric apparatus
US3846772A (en) * 1972-08-11 1974-11-05 Chubb Fire Security Ltd Fire detector responsive to amplitude modulation of a pulsed em beam
CA1052887A (en) * 1974-11-27 1979-04-17 Pyrotector Smoke detector
FR2389949B1 (en) * 1977-05-04 1981-06-12 Klaxon Sa
DE3016530A1 (en) * 1980-04-29 1981-11-05 Hekatron GmbH, 7811 Sulzburg LIGHT-OPTICAL DETECTION DEVICE FOR A FLOATING PARTICLE CONCENTRATION
JPS626181A (en) * 1985-07-02 1987-01-13 Mitsubishi Electric Corp Abnormality detection device for gas insulating apparatus
US5349162A (en) * 1993-04-05 1994-09-20 Whirlpool Corporation Fault detection method and apparatus for a domestic appliance

Also Published As

Publication number Publication date
DE1566721B1 (en) 1970-12-10
US3461443A (en) 1969-08-12
GB1183230A (en) 1970-03-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees