JPS5997429U

JPS5997429U - electromagnetic flow meter

Info

Publication number: JPS5997429U
Application number: JP19120882U
Authority: JP
Inventors: 俊広山本; 矢田　悠
Original assignee: 富士電機株式会社
Priority date: 1982-12-20
Filing date: 1982-12-20
Publication date: 1984-07-02
Also published as: JPH0219693Y2

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の電磁流量計の励磁回路をボすブ　　　　
−ロック図、第２図は本考案を適用した電磁流量計の一
実施例を示すブロック図、第３図は第２図に示す励磁回
路２４の詳細回路図、第４図１〜６は第２図の動作を説
明するタイミング図、第５図および第６図は本考案の側
突流側を示すブロック図−である。１、　２０．　７０．　９５・・・検出器、２，２２・
・・励磁コイル、３．５８・・・フライホイールダイオ
ード、　　　−４・・・金波整流器、５．ＣＴ・・・電
流変成器、６゜４７・・・スイッチイング手段、？、２
６．８０・・・変換器、８・・・商用電源、９Ａ、　　
９Ｂ・・・流量検出角電極、１０・・・測定管、２４・
・・励磁回路、１５Ａ。１５Ｂ、１６Ａ、１６Ｂ、３３Ａ、３３Ｂ、３４Ａ。３４Ｂ、９０Ａ、９０Ｂ、９２Ａ、９２Ｂ・・・端子、
５０・・・増幅器、１８・・・タイミング信号発生源、
５２．５４．４４・・・トランジスタ、Ｅ、４８・・・
直流電源、３７．　３９．　４０．　４２．　４６．　
５６゜５Ｑ、’Ｒｓ・・・抵抗、３２・・・検出コイル
、３５・・・極性判別回路、３８・・・コンパレータ、
４１・・・共通接続線、４３・・・ダイオード、４５・
・・発光ダイオード、Ｃｄ・・・コンデンサ。７０　　　　　　　　　　　　　　　　　　　　８０１
□　　、−−Figure 1 shows the excitation circuit of a conventional electromagnetic flowmeter.
-Lock diagram; Fig. 2 is a block diagram showing an embodiment of an electromagnetic flowmeter to which the present invention is applied; Fig. 3 is a detailed circuit diagram of the excitation circuit 24 shown in Fig. 2; Figs. FIG. 2 is a timing diagram explaining the operation, and FIGS. 5 and 6 are block diagrams showing the side rush side of the present invention. 1, 20. 70. 95...detector, 2,22.
... Excitation coil, 3.58 ... Flywheel diode, -4 ... Gold wave rectifier, 5. CT...Current transformer, 6゜47...Switching means, ? ,2
6.80...Converter, 8...Commercial power supply, 9A,
9B...Flow rate detection angle electrode, 10...Measuring tube, 24.
...Excitation circuit, 15A. 15B, 16A, 16B, 33A, 33B, 34A. 34B, 90A, 90B, 92A, 92B... terminal,
50... Amplifier, 18... Timing signal generation source,
52.54.44...transistor, E, 48...
DC power supply, 37. 39. 40. 42. 46.
56゜5Q, 'Rs...Resistor, 32...Detection coil, 35...Polarity discrimination circuit, 38...Comparator,
41... Common connection line, 43... Diode, 45...
...Light emitting diode, Cd...capacitor. 70 801
□ 、−−

Claims

[Scope of utility model registration request]

(1) A converter with a built-in DC power supply that supplies a DC excitation current at a predetermined timing, and a detector equipped with an excitation coil that introduces the excitation current to generate a wide field in the measurement tube. An electromagnetic flowmeter comprising: a detection coil electromagnetically coupled to the excitation coil disposed in the converter; □ a comparator that generates a rectangular wave output voltage by introducing the induced voltage from the detection coil; The converter includes an AND detection circuit that outputs a match signal only when the output voltage of the converter has a predetermined level in synchronization with the timing, and a display that displays a scheduled display in response to the match signal. 1. An electromagnetic flowmeter, comprising: displaying a polarity connection error of the excitation coil.

(2) A resistor connected in series with the excitation coil is provided in the detector, and the detector is configured to be connected to the output terminal of the comparator via a differentiating means for reducing the voltage between the terminals of the resistor. Scope of claim for utility model registration No. 1
Electromagnetic flowmeter described in section.

(3) The electromagnetic flowmeter according to claim 1, which is a registered utility model, further comprising a current transformer connected in series with the excitation coil instead of the detection coil.
−