GB1257737A - Improvements in or relating to apparatus for measuring or responsive to the level of a liquid - Google Patents
Improvements in or relating to apparatus for measuring or responsive to the level of a liquidInfo
- Publication number
- GB1257737A GB1257737A GB1869369A GB1869369A GB1257737A GB 1257737 A GB1257737 A GB 1257737A GB 1869369 A GB1869369 A GB 1869369A GB 1869369 A GB1869369 A GB 1869369A GB 1257737 A GB1257737 A GB 1257737A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detectors
- level
- recorded
- digital
- alarm
- 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
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
- G01F23/243—Schematic arrangements of probes combined with measuring circuits
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
1,257,737. Level indicating. CENTRAL ELECTRICITY GENERATING BOARD, R. E. MARTIN and E. F. HASLER. 26 June, 1970 [11 April, 1969], No. 18693/69. Heading G4H. The water level in a boiler is detected by four level detectors 11, 12, 13 and 14; faults in the apparatus are detected by comparing the outputs of the detectors. Detectors A and B detect the water level at the same point, are compared at 25 and any difference causes an alarm 26 to be sounded. Detectors C and D operate in a similar manner. Detectors A and C are compared at 30 and detectors B and D are compared at 33, the differences recorded between these pairs of detectors are used to control the operation of the boiler by means of controlled circuitry 32. If a fault is detected then the alarm 26 sends an inhibit signal to the control circuitry 32 to prevent the operation of the control circuit on the basis of incorrect input data. The comparison between detectors A and C, Fig. 3, is performed in both an analogue and a digital manner. The output of the detectors 42 and 46, which each comprise a series of electrodes at different levels which are shorted out by the water level, are fed to a digital to analogue converter 50 and a digital to analogue converter 51. The outputs of the individual detectors are recorded on meters 52 and 53, and any difference between the two level detectors is recorded on central zero meter 54. A digital output which may be used to actuate an alarm is provided by means of relay contacts 71 to 82 which are connected alternately to level detectors 42 and 46. In correct operation the conductors 83 and 84 should be isolated from one another, however if a difference in the levels recorded by the two detectors exists then one pair of contacts at least will be connected in such a way as to short across the two conductors 83, 84. The output of the logic units 61, 62 may be fed to displays 90, 91 and 92 to indicate the liquid level. These displays also act as fault indicators. U.K. Specification 1,056,032 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1869369A GB1257737A (en) | 1969-04-11 | 1969-04-11 | Improvements in or relating to apparatus for measuring or responsive to the level of a liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1869369A GB1257737A (en) | 1969-04-11 | 1969-04-11 | Improvements in or relating to apparatus for measuring or responsive to the level of a liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1257737A true GB1257737A (en) | 1971-12-22 |
Family
ID=10116804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1869369A Expired GB1257737A (en) | 1969-04-11 | 1969-04-11 | Improvements in or relating to apparatus for measuring or responsive to the level of a liquid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1257737A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2323295A1 (en) * | 1972-05-10 | 1973-11-29 | Robert Edgar Martin | DISPLAY DEVICE FOR TRIGGERING AN ALARM AND / OR FOR THE PURPOSE OF A SAFETY CONTROL |
| FR2217531A1 (en) * | 1973-02-08 | 1974-09-06 | Nippon Denso Co | |
| US4711117A (en) * | 1984-05-16 | 1987-12-08 | Schlumberger Electronics, Inc. | Side arm fluid level gauge with spaced-apart sensors for density error compensation |
| WO2002044657A2 (en) * | 2000-11-29 | 2002-06-06 | Clark-Reliance Corporation | Method for detecting faulty liquid level sensors |
| CN107727199A (en) * | 2017-11-03 | 2018-02-23 | 行愿环保科技有限公司 | Waste liquid liquid level detection system and detection method with fault self-checking function |
| CN111306798A (en) * | 2019-12-09 | 2020-06-19 | 珠海格力电器股份有限公司 | Condensing wall-mounted furnace, condensing heat exchanger and blockage fault detection method |
-
1969
- 1969-04-11 GB GB1869369A patent/GB1257737A/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2323295A1 (en) * | 1972-05-10 | 1973-11-29 | Robert Edgar Martin | DISPLAY DEVICE FOR TRIGGERING AN ALARM AND / OR FOR THE PURPOSE OF A SAFETY CONTROL |
| FR2217531A1 (en) * | 1973-02-08 | 1974-09-06 | Nippon Denso Co | |
| US4711117A (en) * | 1984-05-16 | 1987-12-08 | Schlumberger Electronics, Inc. | Side arm fluid level gauge with spaced-apart sensors for density error compensation |
| WO2002044657A2 (en) * | 2000-11-29 | 2002-06-06 | Clark-Reliance Corporation | Method for detecting faulty liquid level sensors |
| WO2002044657A3 (en) * | 2000-11-29 | 2003-03-20 | Clark Reliance Corp | Method for detecting faulty liquid level sensors |
| US6575010B2 (en) | 2000-11-29 | 2003-06-10 | Clark-Reliance Corporation | Method and system for detecting and cross-checking faulty sensors in liquid level indicators and controllers |
| GB2388946A (en) * | 2000-11-29 | 2003-11-26 | Clark Reliance Corp | Method for detecting faulty liquid level sensors |
| GB2388946B (en) * | 2000-11-29 | 2004-05-12 | Clark Reliance Corp | Method and system for detecting and cross checking faulty sensors in liquid level indicators and controllers |
| CN107727199A (en) * | 2017-11-03 | 2018-02-23 | 行愿环保科技有限公司 | Waste liquid liquid level detection system and detection method with fault self-checking function |
| CN111306798A (en) * | 2019-12-09 | 2020-06-19 | 珠海格力电器股份有限公司 | Condensing wall-mounted furnace, condensing heat exchanger and blockage fault detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |