JPS57211018A - Liquid quantity measuring circuit - Google Patents
Liquid quantity measuring circuitInfo
- Publication number
- JPS57211018A JPS57211018A JP56096350A JP9635081A JPS57211018A JP S57211018 A JPS57211018 A JP S57211018A JP 56096350 A JP56096350 A JP 56096350A JP 9635081 A JP9635081 A JP 9635081A JP S57211018 A JPS57211018 A JP S57211018A
- Authority
- JP
- Japan
- Prior art keywords
- circuits
- circuit
- liquid quantity
- quantity measuring
- oscillating
- 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.)
- Granted
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
- G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/266—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
PURPOSE:To secure the high measuring accuracy with a simple constitution of a liquid quantity measuring circuit, by constituting an arithmetic circuit with two oscillating circuits, four frequency dividing circuits, two monostable multivibrators, two gate circuits and two counter circuits respectively. CONSTITUTION:Two oscillating circuits 5 and 6 produce the pulses of a cycle which is proportional to the electrostatic capacitance of a dielectric constant measuring electrode pair 2 and a liquid quantity measuring electrode pair 3. In addition to these oscillating circuits, two frequency dividers 14 and 15, two monostable multivibrators 16 and 17, two gates circuits 18 and 19, a frequency divider 21, and a counter circuit 22 are used. The substraction of the pulse duration is performed by the circuits 18 and 19; the multiplication of the pulse duration is performed by the dividers 14 and 15; and the division of the pulse number is carried out by the circuit 22 respectively. Thus the count value proportional to the liquid quantity is obtained through a latch circuit 23.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56096350A JPS57211018A (en) | 1981-06-22 | 1981-06-22 | Liquid quantity measuring circuit |
| US06/357,585 US4444051A (en) | 1981-03-18 | 1982-03-12 | Electronic liquid level gauge |
| EP82102185A EP0061148B1 (en) | 1981-03-18 | 1982-03-17 | Electronic liquid level gauge |
| DE8282102185T DE3272970D1 (en) | 1981-03-18 | 1982-03-17 | Electronic liquid level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56096350A JPS57211018A (en) | 1981-06-22 | 1981-06-22 | Liquid quantity measuring circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57211018A true JPS57211018A (en) | 1982-12-24 |
| JPH0113523B2 JPH0113523B2 (en) | 1989-03-07 |
Family
ID=14162548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56096350A Granted JPS57211018A (en) | 1981-03-18 | 1981-06-22 | Liquid quantity measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57211018A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02264829A (en) * | 1989-01-13 | 1990-10-29 | Peter A Hochstein | Capacitive liquid sensor |
| EP0575312A1 (en) * | 1989-11-30 | 1993-12-29 | Chrysler Corporation | Liquid level and composition sensor and method |
-
1981
- 1981-06-22 JP JP56096350A patent/JPS57211018A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02264829A (en) * | 1989-01-13 | 1990-10-29 | Peter A Hochstein | Capacitive liquid sensor |
| EP0575312A1 (en) * | 1989-11-30 | 1993-12-29 | Chrysler Corporation | Liquid level and composition sensor and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0113523B2 (en) | 1989-03-07 |
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