GB1043727A - Apparatus for detecting abnormal environmental conditions - Google Patents
Apparatus for detecting abnormal environmental conditionsInfo
- Publication number
- GB1043727A GB1043727A GB23382/63A GB2338263A GB1043727A GB 1043727 A GB1043727 A GB 1043727A GB 23382/63 A GB23382/63 A GB 23382/63A GB 2338263 A GB2338263 A GB 2338263A GB 1043727 A GB1043727 A GB 1043727A
- Authority
- GB
- United Kingdom
- Prior art keywords
- atmosphere
- electrodes
- supply
- control electrode
- trigger
- 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
- 230000002159 abnormal effect Effects 0.000 title 1
- 230000007613 environmental effect Effects 0.000 title 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 2
- 238000010304 firing Methods 0.000 abstract 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 abstract 2
- 230000003213 activating effect Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- 239000011780 sodium chloride Substances 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/08—Actuation involving the use of explosive means
-
- 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
-
- 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
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
1,043,727. Temperature alarms. BRK. ELECTRONICS Inc. June 12, 1963 [June 22, 1962], No. 23382/63. Heading G4N. [Also in Division G1] Fire detection apparatus employs the sudden change in humidity of the atmosphere and the presence of conductive particles to alter the ratio between a sensitive resistance freely exposed to the atmosphere and a second sensitive resistance which is shielded from the atmosphere so that it only responds slowly to changes in the atmosphere, to compensate for normal changes in temperature and humidity. As shown in Fig. 1, three electrodes 2, 3, 4 are formed on the surface of the envelope 1 of a thermionic valve. The electrodes 2 and 4 are formed by firing drawn lines of silver on to the valve but the central electrode is formed by a corrugated band of conducting material. A corrugated insulating screen covers the area between electrodes 2 and 3 so that the atmosphere only reaches it through the corrugations. The surface of the envelope between the electrodes forms the sensitive elements and has a moisture sensitive resistance. Alternatively, the resistances may be formed on the surface of printed circuit boards having a suitable coating such as a mixture of lithium chloride and cobalt oxide or sodium chloride. Various other substrates are also mentioned. Detecting circuit.-As shown in Fig. 10 the two resistances, R1 and R2, are connected across the terminals of a smoothed supply obtained from the rectified output of a transformer. The centre tap 3 is connected through capacitor 34 to the control electrode of a trigger unit 27, the control electrode also being biased through resistor 33. If a rapid change occurs in the value of R1 then the resultant change produces a pulse on the control electrode despite the presence of capacitor 34, thus firing the trigger device and causing a large current to flow from the supply thus activating a relay at the supply which may operate alarms. Other similar circuits are also described (Figs. 3 and 9, not shown). The resistance of the detectors is preferably 10<9> ohms. The supply may be pulsed D.C., D.C. or A.C. and the trigger may comprise hot or cold cathode tubes or transistors.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20454562A | 1962-06-22 | 1962-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1043727A true GB1043727A (en) | 1966-09-28 |
Family
ID=22758360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23382/63A Expired GB1043727A (en) | 1962-06-22 | 1963-06-12 | Apparatus for detecting abnormal environmental conditions |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5037999B1 (en) |
| CH (1) | CH437056A (en) |
| DE (1) | DE1498580A1 (en) |
| GB (1) | GB1043727A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52170642U (en) * | 1976-06-19 | 1977-12-24 | ||
| CH638636A5 (en) * | 1979-03-16 | 1983-09-30 | Cerberus Ag | GAS DETECTOR FOR USE IN AN EXPLOSION HAZARDOUS ENVIRONMENT. |
-
1963
- 1963-06-12 GB GB23382/63A patent/GB1043727A/en not_active Expired
- 1963-06-21 CH CH774763A patent/CH437056A/en unknown
- 1963-06-21 DE DE19631498580 patent/DE1498580A1/en active Pending
-
1968
- 1968-09-25 JP JP43068814A patent/JPS5037999B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1498580A1 (en) | 1970-06-18 |
| JPS5037999B1 (en) | 1975-12-06 |
| CH437056A (en) | 1967-05-31 |
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