GB1256372A - An alarm unit for a measuring device - Google Patents
An alarm unit for a measuring deviceInfo
- Publication number
- GB1256372A GB1256372A GB4216369A GB4216369A GB1256372A GB 1256372 A GB1256372 A GB 1256372A GB 4216369 A GB4216369 A GB 4216369A GB 4216369 A GB4216369 A GB 4216369A GB 1256372 A GB1256372 A GB 1256372A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stylus
- photo
- measuring device
- methane
- interrupted
- 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
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
Abstract
1,256,372. Automatic alarm systems. PLESSEY CO. Ltd. 26 June, 1970 [25 Aug., 1969], No. 42163/69. Heading G4N. [Also in Division G1] In an arrangement for developing alarms according to the position of an indicating or recording stylus of a measuring device by vanes carried by the stylus interrupting either of the paths of two light source/photo-cell arrangements located in the plane of stylus movement when the stylus is deflected beyond predetermined limits, the alarm signals developed are different for the two positions and an additional differing signal is developed when the measuring device and alarm generating apparatus are functioning correctly. The apparatus is described in respect of a flame type methane detector and atone generator is included its output being continuous for a methane excess, and interrupted respectively at two different rates to indicate methane tester flame failure, or satisfactory operation of the equipment. The last named signal is a periodic burst of tone at every 12 seconds and is controlled by a timer circuit which renders the photo-cells which are photo-transistors non-conductive for the period. The tone generator output is keyed by a multivibrator when the light path of the lower limit detector is interrupted. Manual reset keys, and strapping points for fault simulation are also provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4216369A GB1256372A (en) | 1969-08-25 | 1969-08-25 | An alarm unit for a measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4216369A GB1256372A (en) | 1969-08-25 | 1969-08-25 | An alarm unit for a measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1256372A true GB1256372A (en) | 1971-12-08 |
Family
ID=10423139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4216369A Expired GB1256372A (en) | 1969-08-25 | 1969-08-25 | An alarm unit for a measuring device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1256372A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135459A (en) * | 1983-02-15 | 1984-08-30 | Gd Spa | A system for monitoring the operation of machines usable in production and/or product packaging lines |
| CN104123810A (en) * | 2013-04-25 | 2014-10-29 | 北京格宝应用技术有限公司 | Gas leakage alarm device and method thereof |
-
1969
- 1969-08-25 GB GB4216369A patent/GB1256372A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135459A (en) * | 1983-02-15 | 1984-08-30 | Gd Spa | A system for monitoring the operation of machines usable in production and/or product packaging lines |
| CN104123810A (en) * | 2013-04-25 | 2014-10-29 | 北京格宝应用技术有限公司 | Gas leakage alarm device and method thereof |
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