CH567310A5CH827974ACH827974ACH567310A5CH 567310 A5CH567310 A5CH 567310A5CH 827974 ACH827974 ACH 827974ACH 827974 ACH827974 ACH 827974ACH 567310 A5CH567310 A5CH 567310A5
Authority
CH
Switzerland
Application number
CH827974A
Original Assignee
Honeywell 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
Priority claimed from US00372557Aexternal-prioritypatent/US3849685A/en
Priority claimed from US00372552Aexternal-prioritypatent/US3832552A/en
Application filed by Honeywell IncfiledCriticalHoneywell Inc
Publication of CH567310A5publicationCriticalpatent/CH567310A5/xx
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
G—PHYSICS
G01—MEASURING; TESTING
G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
G01T7/00—Details of radiation-measuring instruments
G01T7/12—Provision for actuation of an alarm
G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
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