FR2384307A1 - IONIZATION OPERATED FIRE ALARM - Google Patents

IONIZATION OPERATED FIRE ALARM

Info

Publication number
FR2384307A1
FR2384307A1 FR7807355A FR7807355A FR2384307A1 FR 2384307 A1 FR2384307 A1 FR 2384307A1 FR 7807355 A FR7807355 A FR 7807355A FR 7807355 A FR7807355 A FR 7807355A FR 2384307 A1 FR2384307 A1 FR 2384307A1
Authority
FR
France
Prior art keywords
resistance
ionization
fire alarm
electrode
chamber
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.)
Granted
Application number
FR7807355A
Other languages
French (fr)
Other versions
FR2384307B1 (en
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 FR2384307A1 publication Critical patent/FR2384307A1/en
Application granted granted Critical
Publication of FR2384307B1 publication Critical patent/FR2384307B1/fr
Granted 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)

Abstract

The ionisation fire detector is used in the case of smoke detectors which are to have low radio activity. The detector comprises a measuring chamber (11) with radiation sources (14) and a reference resistance (Rv). Chamber and resistance are connected in series to a supply voltage (Uo). The measuring electrode (13) and the grid electrode (12) are held by insulating supports (16) and (15), respectively. The two supports are electrically connected independently of each other to the input electrode (1). The reference resistance (Rv) is chosen such that its value is at least half as small as the resistance value (RM) of the measuring chamber (11). By these measures, an ionisation fire detector which manages with low radiation activity is provided.
FR7807355A 1977-03-16 1978-03-14 IONIZATION OPERATED FIRE ALARM Granted FR2384307A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2711457A DE2711457C2 (en) 1977-03-16 1977-03-16 Ionization fire detector

Publications (2)

Publication Number Publication Date
FR2384307A1 true FR2384307A1 (en) 1978-10-13
FR2384307B1 FR2384307B1 (en) 1982-07-16

Family

ID=6003797

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7807355A Granted FR2384307A1 (en) 1977-03-16 1978-03-14 IONIZATION OPERATED FIRE ALARM

Country Status (11)

Country Link
AT (1) AT363014B (en)
BE (1) BE864974A (en)
CH (1) CH625071A5 (en)
DE (1) DE2711457C2 (en)
DK (1) DK142515C (en)
FR (1) FR2384307A1 (en)
IT (1) IT1094274B (en)
LU (1) LU79226A1 (en)
NL (1) NL7802821A (en)
NO (1) NO141008C (en)
SE (1) SE438385B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA786519B (en) * 1978-11-20 1980-02-27 Anglo Amer Corp South Africa Detector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1490273A (en) * 1966-03-30 1967-07-28 Nittan Co Ltd Automatic fire alarm device using an ion device
US3980928A (en) * 1973-07-23 1976-09-14 Newington Timothy J Fire detectors

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1280304A (en) * 1968-09-26 1972-07-05 Hochiki Co A smoke sensing detector for smoke sensing apparatus
JPS529998B1 (en) * 1969-04-25 1977-03-19
ZA745453B (en) * 1974-08-26 1976-04-28 Anglo Amer Corp South Africa Improvements in or relating to fire detectors

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1490273A (en) * 1966-03-30 1967-07-28 Nittan Co Ltd Automatic fire alarm device using an ion device
US3980928A (en) * 1973-07-23 1976-09-14 Newington Timothy J Fire detectors

Also Published As

Publication number Publication date
DE2711457A1 (en) 1978-09-21
DE2711457C2 (en) 1985-06-27
NL7802821A (en) 1978-09-19
FR2384307B1 (en) 1982-07-16
AT363014B (en) 1981-07-10
DK142515C (en) 1981-08-03
NO780876L (en) 1978-09-19
BE864974A (en) 1978-09-18
DK142515B (en) 1980-11-10
IT1094274B (en) 1985-07-26
DK116878A (en) 1978-09-17
CH625071A5 (en) 1981-08-31
SE438385B (en) 1985-04-15
LU79226A1 (en) 1978-11-27
NO141008B (en) 1979-09-10
SE7802995L (en) 1978-09-17
ATA177678A (en) 1980-11-15
IT7821086A0 (en) 1978-03-10
NO141008C (en) 1979-12-19

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Legal Events

Date Code Title Description
ST Notification of lapse