GB1226570A - - Google Patents
Info
- Publication number
- GB1226570A GB1226570A GB1226570DA GB1226570A GB 1226570 A GB1226570 A GB 1226570A GB 1226570D A GB1226570D A GB 1226570DA GB 1226570 A GB1226570 A GB 1226570A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diode
- liquid
- current
- volts drop
- temperature
- 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
- 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
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
-
- 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
- G01F23/246—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 thermal devices
- G01F23/247—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 thermal devices for discrete levels
Abstract
1,226,570. Locating a fluid Interface electrically. POST OFFICE. April 24, 1969 [April 22, 1968], No. 18919/68. Heading G1N. [Also in Division G4] The level of liquefied gas in a container is determined by the cooling effect on a heated semiconductor diode, as indicated by its temperature and resistance. The diode D1 Fig. 3 is fed with current from source B1, B2 maintained constant by transistors TR1, TR2 at a value adjustable by resistor R1 sufficient to raise its temperature, and the volts drop across the diode is sensed by a meter M in series with a Zener diode Z. The sensing diode D1 is located at the end of a dipstick Fig, 4 (not shown) which is inserted into the vessel containing liquefied gas. When diode D1 is submerged in the liquid its temperature falls, the resistance rises and the volts drop across it also rises to a value sufficient to fire the Zener diode Z and meter M indicates a large increase in current. The volts drop across the diode may alternatively be maintained constant and the change in current noted. In another embodiment the frequency or RMS value of an A. C. component of the volts drop across the diode is measured, this component only being present when the diode is in liquid. The dipstick may carry a number of test diodes spaced longitudinally, whose resistances are sensed in turn to determine which pair are located on either side of the liquid/gas interface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1891968 | 1968-04-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1226570A true GB1226570A (en) | 1971-03-31 |
Family
ID=10120709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1226570D Expired GB1226570A (en) | 1968-04-22 | 1968-04-22 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1226570A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2486243A1 (en) * | 1979-03-09 | 1982-01-08 | Emhart Ind | METHOD AND APPARATUS FOR DETECTING THE PRESENCE OF A SUBSTANCE ON THE SURFACE OF A LIQUID |
| GB2121187A (en) * | 1982-05-26 | 1983-12-14 | Bosch Gmbh Robert | Liquid level monitoring means |
-
1968
- 1968-04-22 GB GB1226570D patent/GB1226570A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2486243A1 (en) * | 1979-03-09 | 1982-01-08 | Emhart Ind | METHOD AND APPARATUS FOR DETECTING THE PRESENCE OF A SUBSTANCE ON THE SURFACE OF A LIQUID |
| GB2121187A (en) * | 1982-05-26 | 1983-12-14 | Bosch Gmbh Robert | Liquid level monitoring means |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1149607A (en) | Liquid-level measuring equipment | |
| US4362403A (en) | Means and method of sensing temperature | |
| GB1458447A (en) | Fluid-level sensing device | |
| GB1083080A (en) | Thermistor probe and circuitry | |
| KR840002638A (en) | Half a year | |
| US3465587A (en) | Diode sensors for liquid level detection | |
| US2221307A (en) | Conductivity testing system and method | |
| US3537085A (en) | Switching circuit for cavern probe | |
| US3068406A (en) | Suppressed zero frequency meter | |
| US5421202A (en) | Liquid sensor having thermistors | |
| US2967428A (en) | Device for testing the extent to which meat has been cooked | |
| GB1226570A (en) | ||
| GB1031997A (en) | Calibration arrangement for flow meters | |
| GB1176907A (en) | Device for Determining Transition Temperatures | |
| GB1098077A (en) | Improvements in or relating to apparatus for the measurement of rate of flow of a fluid | |
| GB1099409A (en) | Improvements in or relating to liquid-level determining systems | |
| US3132515A (en) | Fluid gauge system | |
| GB1234899A (en) | Liquid level indicator system | |
| US4202203A (en) | Oscillator detector | |
| US3742476A (en) | Fluid flow indicating system | |
| GB1399031A (en) | Device for instantaneously measuring the temperature of a body | |
| SE8403843L (en) | DEVICE ON TEMPERATURE SENSOR | |
| GB1121129A (en) | Improvements relating to fluid flow measuring and indicating | |
| US3469447A (en) | Device for measuring the temperature of a liquid | |
| GB999476A (en) | Improvements in or relating to electric frequency measuring devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |