JPS57153221A - Water level alarm device - Google Patents
Water level alarm deviceInfo
- Publication number
- JPS57153221A JPS57153221A JP56038922A JP3892281A JPS57153221A JP S57153221 A JPS57153221 A JP S57153221A JP 56038922 A JP56038922 A JP 56038922A JP 3892281 A JP3892281 A JP 3892281A JP S57153221 A JPS57153221 A JP S57153221A
- Authority
- JP
- Japan
- Prior art keywords
- detecting
- water tank
- electrostatic capacity
- outside circumference
- water level
- 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.)
- Pending
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
- G01F23/268—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 mounting arrangements of probes
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 otain a device which is not caught by eyes and is out of danger of troubles and malfunctions, by arrnging plural linear or band-shaped conductors around the outside circumference of a water tank to make detecting electrodes and detecting the water level on a basis of the change of the electrostatic capacity between two proper detecting electrodes. CONSTITUTION:Plual linear or band-shaped conductors are arranged on a part of the outside circumference of a water tank or around the outside circumference of the water tank consisting essentially of electric insulating materials to make detecting electrode. When the water level reaches the level of an electrode 22 around the outside circumference of the water tank 1, an electrostatic capacity C12 between electrodes 21 and 22 becomes larger than that for the water level under the level of the electrode 22, and this change of the electrostatic capacity is discriminated by an electrnic circuit part of a detector part 3. When the electrostatic capacity larger than a constant quantity is generated in the input side of an amplifying circuit 4, self-oscillation is caused, and a relay circuit 7 is driven by the output obtained by detecting this oscillation output by a detecting circuit 6, thus issuing an alarm with a buzzer, a lamp, or the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56038922A JPS57153221A (en) | 1981-03-17 | 1981-03-17 | Water level alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56038922A JPS57153221A (en) | 1981-03-17 | 1981-03-17 | Water level alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57153221A true JPS57153221A (en) | 1982-09-21 |
Family
ID=12538709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56038922A Pending JPS57153221A (en) | 1981-03-17 | 1981-03-17 | Water level alarm device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57153221A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013193319A (en) * | 2012-03-19 | 2013-09-30 | Ulvac Japan Ltd | Liquid amount detecting device, and liquid supply device |
| GB2531291A (en) * | 2014-10-14 | 2016-04-20 | Aspen Pumps Ltd | Liquid level detector |
| WO2020136944A1 (en) * | 2018-12-27 | 2020-07-02 | 株式会社島津製作所 | Method for detecting presence/absence of liquid suctioned by syringe pump, and device with syringe pump |
-
1981
- 1981-03-17 JP JP56038922A patent/JPS57153221A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013193319A (en) * | 2012-03-19 | 2013-09-30 | Ulvac Japan Ltd | Liquid amount detecting device, and liquid supply device |
| GB2531291A (en) * | 2014-10-14 | 2016-04-20 | Aspen Pumps Ltd | Liquid level detector |
| GB2531291B (en) * | 2014-10-14 | 2019-12-04 | Aspen Pumps Ltd | Liquid level detector |
| US10760938B2 (en) | 2014-10-14 | 2020-09-01 | Aspen Pumps Limited | Liquid level detector |
| WO2020136944A1 (en) * | 2018-12-27 | 2020-07-02 | 株式会社島津製作所 | Method for detecting presence/absence of liquid suctioned by syringe pump, and device with syringe pump |
| CN113227578A (en) * | 2018-12-27 | 2021-08-06 | 株式会社岛津制作所 | Method for detecting whether syringe pump sucks liquid or not and device with syringe pump |
| JPWO2020136944A1 (en) * | 2018-12-27 | 2021-10-28 | 株式会社島津製作所 | A method for detecting the presence or absence of liquid inhalation by a syringe pump, and a device equipped with a syringe pump. |
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