JPS566117A - Liquid-level detector - Google Patents

Liquid-level detector

Info

Publication number
JPS566117A
JPS566117A JP8215479A JP8215479A JPS566117A JP S566117 A JPS566117 A JP S566117A JP 8215479 A JP8215479 A JP 8215479A JP 8215479 A JP8215479 A JP 8215479A JP S566117 A JPS566117 A JP S566117A
Authority
JP
Japan
Prior art keywords
liquid
output
oscillator
level
liquid 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
Application number
JP8215479A
Other languages
Japanese (ja)
Inventor
Jun Iguchi
Tetsuo Obata
Masaki Nakamura
Wataru Takahashi
Toshiyoshi Yamamoto
Hiroyuki Nonaka
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 Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8215479A priority Critical patent/JPS566117A/en
Publication of JPS566117A publication Critical patent/JPS566117A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To eliminate the need for calibration according to the kind of liquid and corrections accompanying a change of the kind of liquid, by detecting a liquid level without reference to the kind of liquid by making use of the variation in electrostatic capacity of a thermocouple with the fluctuations of the liquid level.
CONSTITUTION: Auxiliary electrode 2 coming in contact entirely with liquid 1 at any time and electrode 3 varying in area contacting with liquid 1 with a liquid level are connected to oscillators 4 and 5 whose oscillation frequencies depend upon the electrostatic capacity, and the output of AND circuit 6 that sends the output of oscillator 4 when socillator 5 generates a high-level output is connected to counter 7. Denoting the time when the output of oscillator 5 is high as T1' and the oscillation frequency of oscillator 4 and T2, the number NP of pulses appearing at the output of AND circuit 6 is T1'/T2 and an output relating to the area of a part of electrode 3 contacting with liquid 1 i.e. the liquid level can be obtained without depending to the dielectric constant of liquid 1.
COPYRIGHT: (C)1981,JPO&Japio
JP8215479A 1979-06-27 1979-06-27 Liquid-level detector Pending JPS566117A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8215479A JPS566117A (en) 1979-06-27 1979-06-27 Liquid-level detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8215479A JPS566117A (en) 1979-06-27 1979-06-27 Liquid-level detector

Publications (1)

Publication Number Publication Date
JPS566117A true JPS566117A (en) 1981-01-22

Family

ID=13766510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8215479A Pending JPS566117A (en) 1979-06-27 1979-06-27 Liquid-level detector

Country Status (1)

Country Link
JP (1) JPS566117A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6042916U (en) * 1983-08-31 1985-03-26 東京計装株式会社 flow rate detection device
JPS61283831A (en) * 1985-06-10 1986-12-13 Misuzu Erii:Kk Electrostatic capacity type level gauge
JPS62209303A (en) * 1986-03-11 1987-09-14 Mayekawa Mfg Co Ltd Freezing thickness detector
US5144835A (en) * 1990-09-12 1992-09-08 Robertshaw Controls Company Liquid level sensing device and methods of making and operating the same
JPH0557768U (en) * 1992-01-07 1993-07-30 日本航空電子工業株式会社 Contact for connector

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6042916U (en) * 1983-08-31 1985-03-26 東京計装株式会社 flow rate detection device
JPH0128418Y2 (en) * 1983-08-31 1989-08-30
JPS61283831A (en) * 1985-06-10 1986-12-13 Misuzu Erii:Kk Electrostatic capacity type level gauge
JPS62209303A (en) * 1986-03-11 1987-09-14 Mayekawa Mfg Co Ltd Freezing thickness detector
US5144835A (en) * 1990-09-12 1992-09-08 Robertshaw Controls Company Liquid level sensing device and methods of making and operating the same
JPH0557768U (en) * 1992-01-07 1993-07-30 日本航空電子工業株式会社 Contact for connector

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