GB665409A - Improvements in or relating to electrically-operated level indicating arrangements - Google Patents
Improvements in or relating to electrically-operated level indicating arrangementsInfo
- Publication number
- GB665409A GB665409A GB22127/49A GB2212749A GB665409A GB 665409 A GB665409 A GB 665409A GB 22127/49 A GB22127/49 A GB 22127/49A GB 2212749 A GB2212749 A GB 2212749A GB 665409 A GB665409 A GB 665409A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- hopper
- resistance
- indicator
- relay
- 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)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
665,409. Shoots and hoppers. PREPARATION INDUSTRIELLE DES COMBUSTIBLES. Aug. 25, 1949. [Sept. 1, 1948] No. 22127/49. Class 78 (i). The electrical resistance between a pair of electrodes contacting the material in a hopper controls a level indicating or recording device. The electrodes, one of which is suspended from the mouth of the hopper and the other of which is secured to the hopper, are connected in a bridge circuit at C, D. When there is an open circuit between the electrodes, i.e. when the hopper is not filled, the bridge is balanced so that the voltage e applied to the grid of a triode Tu is zero and thus the maximum anode current i will flow through the triode and a resistor N. The resultant volt drop across N will ensure that the voltage applied to the gas filled relay Th will be insufficient to allow it to operate. When the resistance between C-D decreases, due to the accumulation of material between the electrodes, the bridge becomes progressively unbalanced and the grid of Tu is given a progressive negative bias which progressively decreases the anode current i, and thus the volt drop across N, until the voltage applied to the relay Th is high enough for it to operate so operating an indicator M. The relay Th is chosen so that its fully saturated current is insufficient to damage the indicator M. To vary the value of the resistance between the electrodes which is necessary to operate the indicator M, so that this device can be used with various materials, the resistance m is made variable and the area of the electrodes can be altered. Specification 8791/12, [Class 39 (iii)], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR665409X | 1948-09-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB665409A true GB665409A (en) | 1952-01-23 |
Family
ID=9013311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22127/49A Expired GB665409A (en) | 1948-09-01 | 1949-08-25 | Improvements in or relating to electrically-operated level indicating arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB665409A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE972695C (en) * | 1952-02-07 | 1959-09-10 | Koppers Gmbh Heinrich | Method and device for displaying the filling status of bunkers |
-
1949
- 1949-08-25 GB GB22127/49A patent/GB665409A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE972695C (en) * | 1952-02-07 | 1959-09-10 | Koppers Gmbh Heinrich | Method and device for displaying the filling status of bunkers |
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