GB1281121A - Improvements in or relating to fire detection systems - Google Patents

Improvements in or relating to fire detection systems

Info

Publication number
GB1281121A
GB1281121A GB76270A GB76270A GB1281121A GB 1281121 A GB1281121 A GB 1281121A GB 76270 A GB76270 A GB 76270A GB 76270 A GB76270 A GB 76270A GB 1281121 A GB1281121 A GB 1281121A
Authority
GB
United Kingdom
Prior art keywords
fire
door
detection
jan
solenoid
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
GB76270A
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of GB1281121A publication Critical patent/GB1281121A/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 Alarms (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Alarm Systems (AREA)

Abstract

1281121 Ionisation detectors SIEMENS AG 7 Jan 1970 [8 Jan 1969] 762/70 Heading G1N In a fire-detecting system, a fire-door is automatically closed upon detection of a fire. As shown, a reference ionisation chamber K1 and a smoke detection ionisation chamber K2 are provided in the door control circuit which is connected to the mains via a transformer KT. Upon detection of smoke the potential at point 1 changes thus blocking a F. E. T. T1 which then causes a relay A to be denergized, via T2. Contact a then de-energized a door-holding, solenoid for closing the fire-door. In a modification, the transformer KT may be replaced by the doorholding solenoid which is provided with a secondary winding. A switch PT is provided for testing purposes. The system includes at least one fire alarm circuit which is operated undependently of the control circuit.
GB76270A 1969-01-08 1970-01-07 Improvements in or relating to fire detection systems Expired GB1281121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691900771 DE1900771C3 (en) 1969-01-08 1969-01-08 Circuit arrangement for an automatically closing fire door

Publications (1)

Publication Number Publication Date
GB1281121A true GB1281121A (en) 1972-07-12

Family

ID=5721953

Family Applications (1)

Application Number Title Priority Date Filing Date
GB76270A Expired GB1281121A (en) 1969-01-08 1970-01-07 Improvements in or relating to fire detection systems

Country Status (3)

Country Link
CH (1) CH511494A (en)
DE (1) DE1900771C3 (en)
GB (1) GB1281121A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108131074A (en) * 2017-12-28 2018-06-08 无锡蓝天电子股份有限公司 A kind of fire resistant doorsets monitor of the urgent input interface of band

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016210777B3 (en) * 2016-06-16 2017-08-31 Geze Gmbh door drive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108131074A (en) * 2017-12-28 2018-06-08 无锡蓝天电子股份有限公司 A kind of fire resistant doorsets monitor of the urgent input interface of band

Also Published As

Publication number Publication date
DE1900771C3 (en) 1979-04-26
CH511494A (en) 1971-08-15
DE1900771B2 (en) 1978-08-31
DE1900771A1 (en) 1970-08-27

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees