JPS5735723A - Detector of liquid level - Google Patents

Detector of liquid level

Info

Publication number
JPS5735723A
JPS5735723A JP11293180A JP11293180A JPS5735723A JP S5735723 A JPS5735723 A JP S5735723A JP 11293180 A JP11293180 A JP 11293180A JP 11293180 A JP11293180 A JP 11293180A JP S5735723 A JPS5735723 A JP S5735723A
Authority
JP
Japan
Prior art keywords
resistance
rectangular wave
current
flowed
capacitor
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
Application number
JP11293180A
Other languages
Japanese (ja)
Other versions
JPH0355769B2 (en
Inventor
Hirotsugu Minami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP11293180A priority Critical patent/JPS5735723A/en
Publication of JPS5735723A publication Critical patent/JPS5735723A/en
Publication of JPH0355769B2 publication Critical patent/JPH0355769B2/ja
Granted legal-status Critical Current

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)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE:To remove influence due to the distribution capacity of electric wire, by connecting the output of a rectangular wave voltage generator with a liquid-level detection electrode through a current detection circuit detecting the current after elapsing a fixed time from an inversion time of output of rectangular wave. CONSTITUTION:The output of a rectangular wave voltage generating circuit 8 being zero in mean value is iputted electric wires 5A, 5B through an electric current detection circuit 9 consisting of a resistance 9a, a capacitor 9b and electrodes 4A, 4B having different lengths are connected with the end of the wires 5A, 5B and then, these are arranged in a water vessel 7. Moreover, the capacity C9b of the capacitor 9b of the circuit 9 is set for a distribution capacity CO of the wires 5A, 5B so as to be C9b>>CO. By thus constitution, when the water level of a water bath 7 is W1, the current by the rectangular wave voltage is flowed through the capacitor 9b and is not flowed to the resistance 9a. Further, when the water level is W2, the current is flowed to the resistance 9a and voltage is generated on both ends of the resistance 9a and as a result, it is known that the water level is reached W2 by detecting this voltage.
JP11293180A 1980-08-13 1980-08-13 Detector of liquid level Granted JPS5735723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11293180A JPS5735723A (en) 1980-08-13 1980-08-13 Detector of liquid level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11293180A JPS5735723A (en) 1980-08-13 1980-08-13 Detector of liquid level

Publications (2)

Publication Number Publication Date
JPS5735723A true JPS5735723A (en) 1982-02-26
JPH0355769B2 JPH0355769B2 (en) 1991-08-26

Family

ID=14599063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11293180A Granted JPS5735723A (en) 1980-08-13 1980-08-13 Detector of liquid level

Country Status (1)

Country Link
JP (1) JPS5735723A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008263578A (en) * 2007-03-19 2008-10-30 Yokogawa Electric Corp Amplifier
US10416020B2 (en) * 2014-06-05 2019-09-17 Endress+Hauser Se+Co.Kg Method and apparatus for monitoring fill level of a medium in a container

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008263578A (en) * 2007-03-19 2008-10-30 Yokogawa Electric Corp Amplifier
US10416020B2 (en) * 2014-06-05 2019-09-17 Endress+Hauser Se+Co.Kg Method and apparatus for monitoring fill level of a medium in a container

Also Published As

Publication number Publication date
JPH0355769B2 (en) 1991-08-26

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