GB1407639A - Ionization fire alarm - Google Patents

Ionization fire alarm

Info

Publication number
GB1407639A
GB1407639A GB6002172A GB6002172A GB1407639A GB 1407639 A GB1407639 A GB 1407639A GB 6002172 A GB6002172 A GB 6002172A GB 6002172 A GB6002172 A GB 6002172A GB 1407639 A GB1407639 A GB 1407639A
Authority
GB
United Kingdom
Prior art keywords
airflow
aperture
velocity
recess
air
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
GB6002172A
Other languages
English (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.)
Preussag AG Feuerschutz
Original Assignee
Preussag AG Feuerschutz
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
Priority claimed from DE19712165619 external-priority patent/DE2165619C2/de
Priority claimed from DE2230932A external-priority patent/DE2230932C2/de
Application filed by Preussag AG Feuerschutz filed Critical Preussag AG Feuerschutz
Publication of GB1407639A publication Critical patent/GB1407639A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
    • H01J41/06—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of cold cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
    • H01J41/08—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of radioactive substances, e.g. alphatrons

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)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
GB6002172A 1971-12-30 1972-12-29 Ionization fire alarm Expired GB1407639A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712165619 DE2165619C2 (de) 1971-12-30 Ionisationsfeuermelder
DE2230932A DE2230932C2 (de) 1972-06-23 1972-06-23 Ionisationsfeuermelder

Publications (1)

Publication Number Publication Date
GB1407639A true GB1407639A (en) 1975-09-24

Family

ID=25762258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6002172A Expired GB1407639A (en) 1971-12-30 1972-12-29 Ionization fire alarm

Country Status (9)

Country Link
JP (1) JPS4879998A (https=)
AT (1) AT332762B (https=)
BE (1) BE793205A (https=)
CH (1) CH558059A (https=)
ES (1) ES410210A1 (https=)
FR (1) FR2166005B3 (https=)
GB (1) GB1407639A (https=)
IT (1) IT976193B (https=)
NL (1) NL7217843A (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH551057A (de) * 1973-04-17 1974-06-28 Cerberus Ag Ionisationsfeuermelder.
AT378431B (de) * 1983-06-30 1985-08-12 Siemens Ag Oesterreich Probenkammer herkoemmlicher groesse zum einbau eines ionisations-rauchmelder-einsatzes

Also Published As

Publication number Publication date
NL7217843A (https=) 1973-07-03
BE793205A (fr) 1973-04-16
JPS4879998A (https=) 1973-10-26
FR2166005A1 (https=) 1973-08-10
IT976193B (it) 1974-08-20
ES410210A1 (es) 1975-12-01
ATA1095272A (de) 1976-01-15
CH558059A (de) 1975-01-15
AT332762B (de) 1976-10-11
FR2166005B3 (https=) 1976-02-13

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee