JPS6082217U

JPS6082217U - electromagnetic flow meter

Info

Publication number: JPS6082217U
Application number: JP17381683U
Authority: JP
Inventors: 尚鳥丸
Original assignee: 横河電機株式会社
Priority date: 1983-11-10
Filing date: 1983-11-10
Publication date: 1985-06-07
Also published as: JPH0450508Y2

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 drawings]

第１図は従来の電磁流量計の実施例を示す構成図、第２
図は第１図における給電増幅器の具体的な構成を示す構
成図、第３図は本考案の第１の実施例を示すブロック図
、第４図は第３図の回路の動作を説明する波形図、第５
図は本考案の第２の実施例の要部を示すブロック図、第
６図は第５図の実施例の動作を示す波形図、第７図は本
考案の第３の実施例を示すブロック図である。１・・・導電性管路、３ａ、３ｂ・・・測定電極、４ａ
、４ｂ・・・給電増幅器、１３ａ・・・誤差増幅器、１
４ａ・・・電圧／パルス変換回路、Ｅユ・・・信号電圧
、Ｅｐ・・・パルス列信号、Ｅ３・・・給電電源、Ｄ・
・・フライホイールダイオード、Ｌ・・・インダクタン
ス、ＳＷ・・・スイッチ、Ｒｗ・・・管抵抗、Ｖあ・：
・給電電圧。Figure 1 is a configuration diagram showing an example of a conventional electromagnetic flowmeter;
3 is a block diagram showing the first embodiment of the present invention, and FIG. 4 is a waveform explaining the operation of the circuit shown in FIG. 3. Figure, 5th
The figure is a block diagram showing the main parts of the second embodiment of the present invention, FIG. 6 is a waveform diagram showing the operation of the embodiment of FIG. 5, and FIG. 7 is a block diagram showing the third embodiment of the present invention. It is a diagram. 1... Conductive conduit, 3a, 3b... Measuring electrode, 4a
, 4b... feeding amplifier, 13a... error amplifier, 1
4a...Voltage/pulse conversion circuit, Eyu...signal voltage, Ep...pulse train signal, E3...power supply, D...
...Flywheel diode, L...inductance, SW...switch, Rw...tube resistance, Va...:
・Power supply voltage.

Claims

[Scope of utility model registration request]

In an electromagnetic flowmeter that forms a potential distribution in the conductive conduit that is the same as the potential generated inside the conductive conduit through which the fluid to be measured flows, a signal voltage corresponding to the flow rate of the fluid to be measured and the conductive an error amplifier that amplifies the difference between the tube wall potential of the sexual canal wall and a tube potential; a voltage/pulse conversion circuit that converts the output of the error amplifier into a pulse train; and a switch driven by the output of the voltage/pulse conversion circuit. , an inductance connected in series to a power supply and the switch via the tube wall, and a flywheel diode connected in parallel to a series circuit constituted by the tube wall and the inductance, An electromagnetic flowmeter characterized in that a current is caused to flow from the power supply to the tube wall by opening and closing a switch to form the potential distribution.