GB1179531A - Particle Detecting Devices - Google Patents
Particle Detecting DevicesInfo
- 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
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
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU573243B2 (en) * | 1983-08-12 | 1988-06-02 | Vision Systems Limited | Pollution detecting apparatus |
-
1968
- 1968-04-03 GB GB06054/68A patent/GB1179531A/en not_active Expired
- 1968-04-17 FR FR1569928D patent/FR1569928A/fr not_active Expired
- 1968-04-19 AT AT382668A patent/AT288208B/en not_active IP Right Cessation
- 1968-04-19 CH CH586168A patent/CH464743A/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR1569928A (en) | 1969-06-06 |
AT288208B (en) | 1971-02-25 |
CH464743A (en) | 1968-10-31 |
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