GB1379922A - Measuring circuits - Google Patents

Measuring circuits

Info

Publication number
GB1379922A
GB1379922A GB1468673A GB1468673A GB1379922A GB 1379922 A GB1379922 A GB 1379922A GB 1468673 A GB1468673 A GB 1468673A GB 1468673 A GB1468673 A GB 1468673A GB 1379922 A GB1379922 A GB 1379922A
Authority
GB
United Kingdom
Prior art keywords
detector
zone
switching
output
zones
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
GB1468673A
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.)
Environment One Corp
Original Assignee
Environment One Corp
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 Environment One Corp filed Critical Environment One Corp
Publication of GB1379922A publication Critical patent/GB1379922A/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
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/065—Investigating concentration of particle suspensions using condensation nuclei counters

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)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Amplifiers (AREA)
  • Fire Alarms (AREA)
GB1468673A 1971-02-08 1972-02-08 Measuring circuits Expired GB1379922A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11356171A 1971-02-08 1971-02-08

Publications (1)

Publication Number Publication Date
GB1379922A true GB1379922A (en) 1975-01-08

Family

ID=22350143

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1468673A Expired GB1379922A (en) 1971-02-08 1972-02-08 Measuring circuits
GB585672A Expired GB1379921A (en) 1971-02-08 1972-02-08 Mesuring circuits

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB585672A Expired GB1379921A (en) 1971-02-08 1972-02-08 Mesuring circuits

Country Status (7)

Country Link
US (1) US3678488A (enExample)
CA (1) CA1003524A (enExample)
CH (1) CH549250A (enExample)
DE (1) DE2205690A1 (enExample)
FR (1) FR2128315B1 (enExample)
GB (2) GB1379922A (enExample)
IT (1) IT947365B (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2327497C3 (de) * 1973-05-30 1981-12-24 Benno 5430 Wettingen Aargau Perren Melder für Widerstandsänderungen mit nachgeschalteter Alarmeinrichtung
GB8913773D0 (en) * 1989-06-15 1989-08-02 Fire Fighting Enterprises Uk L Particle detectors
JP3231886B2 (ja) * 1993-03-31 2001-11-26 能美防災株式会社 光電式火災感知器
WO2001073381A2 (en) † 2000-03-28 2001-10-04 Matsushita Electric Works, Ltd. Particle sensor
US9239025B2 (en) * 2009-06-29 2016-01-19 GM Global Technology Operations LLC Condensation detection systems and methods
CN113327395A (zh) * 2021-05-13 2021-08-31 蚌埠依爱消防电子有限责任公司 一种扩大光电式烟雾探测器响应量程的方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3618061A (en) * 1969-04-30 1971-11-02 Eaton Yale & Towne Monitoring apparatus for monitoring the density of a material carried by a fluid and the flow of the fluid

Also Published As

Publication number Publication date
CH549250A (de) 1974-05-15
CA1003524A (en) 1977-01-11
GB1379921A (en) 1975-01-08
DE2205690A1 (de) 1972-08-10
IT947365B (it) 1973-05-21
FR2128315B1 (enExample) 1976-08-20
FR2128315A1 (enExample) 1972-09-22
US3678488A (en) 1972-07-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee