JPS57153222A - Liquid quantity measuring circuit - Google Patents
Liquid quantity measuring circuitInfo
- Publication number
- JPS57153222A JPS57153222A JP56039186A JP3918681A JPS57153222A JP S57153222 A JPS57153222 A JP S57153222A JP 56039186 A JP56039186 A JP 56039186A JP 3918681 A JP3918681 A JP 3918681A JP S57153222 A JPS57153222 A JP S57153222A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- frequency divider
- pulse
- output
- generates
- 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)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
PURPOSE:To obtain a device which is cheap and has a simple constitution and is made into an IC easily, by providing a generating circuit which generates a pulse proportional to an electrostatic capacity, a reference pulse generating circuit, a monostable multivibrator, and a counter circuit. CONSTITUTION:A frequency divider 15 is connected to an oscillating circuit 11 which generates the pulse of a period T1 proportional to an electrostatic capacity C of a pair of electrostatic capacity sensors 10 put in a liquid to be measured. An oscillating circuit 16 which generates a reference pulse is connected to a frequency divider 17, and frequency dividers 15 and 17 are connected to a monostable multivibrator 20 consisting of a counter circuit 18 and a comparator 19. A counter circuit 21 is provided which starts counting output pulses of the frequency divider 17 by the inversion output of the comparator 19 at the end of time count of the monostable multivibrator 20 and continues counting until the counter circuit 18 is reset by the next pulse output of the frequency divider, and the output of the circuit 21 is displayed on a meter 24 through a latch circuit 22 and a D/A converter.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56039186A JPS57153222A (en) | 1981-03-18 | 1981-03-18 | Liquid quantity measuring circuit |
| US06/357,585 US4444051A (en) | 1981-03-18 | 1982-03-12 | Electronic liquid level gauge |
| DE8282102185T DE3272970D1 (en) | 1981-03-18 | 1982-03-17 | Electronic liquid level gauge |
| EP82102185A EP0061148B1 (en) | 1981-03-18 | 1982-03-17 | Electronic liquid level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56039186A JPS57153222A (en) | 1981-03-18 | 1981-03-18 | Liquid quantity measuring circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57153222A true JPS57153222A (en) | 1982-09-21 |
| JPS6310771B2 JPS6310771B2 (en) | 1988-03-09 |
Family
ID=12546072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56039186A Granted JPS57153222A (en) | 1981-03-18 | 1981-03-18 | Liquid quantity measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57153222A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4655283B2 (en) * | 2006-06-21 | 2011-03-23 | セイコーエプソン株式会社 | Liquid consumption state detector |
| JP2006343337A (en) * | 2006-06-21 | 2006-12-21 | Seiko Epson Corp | Liquid consumption state detector |
-
1981
- 1981-03-18 JP JP56039186A patent/JPS57153222A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6310771B2 (en) | 1988-03-09 |
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