GB1179531A - Particle Detecting Devices - Google Patents

Particle Detecting Devices

Info

Publication number
GB1179531A
GB1179531A GB06054/68A GB1605468A GB1179531A GB 1179531 A GB1179531 A GB 1179531A GB 06054/68 A GB06054/68 A GB 06054/68A GB 1605468 A GB1605468 A GB 1605468A GB 1179531 A GB1179531 A GB 1179531A
Authority
GB
United Kingdom
Prior art keywords
source
lamp failure
arrangement
april
transistor
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
GB06054/68A
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.)
Pyrotector Inc
Original Assignee
Pyrotector 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
Application filed by Pyrotector Inc filed Critical Pyrotector Inc
Publication of GB1179531A publication Critical patent/GB1179531A/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
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • 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
    • G08B17/113—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1,179,531. Photo-electric particle detecting apparatus. PYROTECTOR Inc. April 3, 1968 [April 2, 1967], No.16054/68. Heading G1A. In an arrangement for detecting the presence of particles in a light beam, the voltage drop across a resistive device in series with the light source is used to operate a second (lamp failure) alarm. Source 14 is energized through a voltage regulating arrangement comprising a transistor T1, Fig. 3, a resistor K1 and a Zener diode Z and the potential at the connection between the, emitter and the source 14 is used to switch a transistor T4 and thus control the lamp failure relay R2. The photocell C1 the supply to which is also regulated by the Zener diode operates relay R1 when particles are present. In an alternative arrangement for dialing with filament short circuit lamp failure a photocell responsive to the source light is connected between transistors T1 and T4. The particle investigation enclosure is the same as that described in Specification 918,908.
GB06054/68A 1967-04-21 1968-04-03 Particle Detecting Devices Expired GB1179531A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US63272867A 1967-04-21 1967-04-21

Publications (1)

Publication Number Publication Date
GB1179531A true GB1179531A (en) 1970-01-28

Family

ID=24536696

Family Applications (1)

Application Number Title Priority Date Filing Date
GB06054/68A Expired GB1179531A (en) 1967-04-21 1968-04-03 Particle Detecting Devices

Country Status (4)

Country Link
AT (1) AT288208B (en)
CH (1) CH464743A (en)
FR (1) FR1569928A (en)
GB (1) GB1179531A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU573243B2 (en) * 1983-08-12 1988-06-02 Vision Systems Limited Pollution detecting apparatus

Also Published As

Publication number Publication date
AT288208B (en) 1971-02-25
CH464743A (en) 1968-10-31
FR1569928A (en) 1969-06-06

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