JPS6134426U

JPS6134426U - Liquid level detection device

Info

Publication number: JPS6134426U
Application number: JP11836084U
Authority: JP
Inventors: 貞夫星野
Original assignee: カルソニックカンセイ株式会社
Priority date: 1984-08-02
Filing date: 1984-08-02
Publication date: 1986-03-03

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図はこの一案の一実施例に係る液面位装置の回路図
、第２図はこの考案の他の実施例に係る回路図、第３図
は第２図回路の動作を説明するためのタイムチャート、
第４図は従来の液面位装置の回路図である。１・・・タンク、２・・・第１の電極、３・・・第２の
電・極、４・・・液面位検出用コンデンサ、５・・・演
算増幅器、６，７．９・・・抵抗、８・・・感温抵
抗素子、１ｏ・・・発振器、１１・・・積分回路、１２
・・・比較回路、、１３・・・スイッチ。Figure 1 is a circuit diagram of a liquid level device according to one embodiment of this idea, Figure 2 is a circuit diagram of another embodiment of this invention, and Figure 3 explains the operation of the circuit shown in Figure 2. time chart for,
FIG. 4 is a circuit diagram of a conventional liquid level device. DESCRIPTION OF SYMBOLS 1...tank, 2...1st electrode, 3...2nd electrode/electrode, 4...capacitor for liquid level detection, 5...operational amplifier, 6, 7. 9... Resistor, 8... Temperature sensitive resistance element, 1o... Oscillator, 11... Integrating circuit, 12
... Comparison circuit, 13... Switch.

Claims

[Scope of utility model registration request]

at least one pair of electrodes 2 arranged oppositely in the liquid to be measured;
3, the capacitor 4 has a capacitance that changes depending on the change in the liquid level of the liquid to be measured, and a capacitor 4 that has a temperature characteristic opposite to that of the capacitor and is connected in series with the capacitor 4 and has a time constant. Temperature-sensitive resistance element 8 forming a circuit
By inputting the voltage of the hourly sale quantity corresponding to the capacitance from the capacitor 4, and detecting that the voltage exceeds a predetermined voltage, the time required to reach the predetermined voltage is determined. In a liquid level detection device equipped with a liquid level detection unit 5, 6, 7, 9, 12.13 that outputs a frequency or pulse width signal, the temperature sensitive resistance element 8 is always immersed in the liquid to be measured. 1. A liquid level detection device, wherein the liquid level detection device is arranged to correct a change in a time constant based on a change in capacitance of the capacitor 4 due to a change in temperature of the liquid to be measured.