JPS5971124U - Calibration device for electromagnetic flowmeter converter - Google Patents

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

【図面の簡単な説明】[Brief explanation of drawings]

第１図は電磁流量計のブロック図、第２図は第１図にお
ける要部の信号波形図で、同図Ａは商用周波励磁方式の
場合、同図Ｂは低周波励磁方式の場合、第３図は電磁流
量計の変換器の従来の校正装置のブロック図で、同図Ａ
およびＢはそれぞれ商用周波励磁方式および低周波励磁
方式の各変換器用の校正装置、第４図は電磁流量計の変
換器の本考案による校正装置のブロック図である。 各図において、■・・・検出器、■・・・変換器、ＩＩ
ａ・・・商用周波励磁方式の変換器、ｎｂ・・・低周波
励磁方式の変換器、１ａ・・・被測定流体、５・・・サ
ーチコイル、３３・・・正弦波発生器、３９・・・微分
パルス発生器、４０・・・切換スイッチ、４１・・・出
力回路、４２・・・本考案による校正装置、Ｂ・・・磁
束密度、Ｅｌ、Ｅ２・・・被測定流体１ａに発生する起
電力、−Ｅ４・・・サーチコイル５に発生する起電力、
Ｓｏ・・・正弦波電圧、Ｓｌ・・・矩形波電圧。Figure 1 is a block diagram of an electromagnetic flowmeter, and Figure 2 is a signal waveform diagram of the main parts in Figure 1. Figure A is for the commercial frequency excitation method, and Figure B is for the low frequency excitation method. Figure 3 is a block diagram of a conventional calibration device for an electromagnetic flowmeter converter.
4 is a block diagram of a calibration device according to the present invention for a converter of an electromagnetic flowmeter. In each figure, ■...detector, ■...converter, II
a... Commercial frequency excitation type converter, nb... Low frequency excitation type converter, 1a... Fluid to be measured, 5... Search coil, 33... Sine wave generator, 39... ... Differential pulse generator, 40 ... Changeover switch, 41 ... Output circuit, 42 ... Calibration device according to the present invention, B ... Magnetic flux density, El, E2 ... Generated in the fluid to be measured 1a Electromotive force generated in the search coil 5, -E4... Electromotive force generated in the search coil 5,
So...Sine wave voltage, Sl...Square wave voltage.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 被測定流体に磁界を加えてファラデーの電磁誘導側にも
とづいて前記被測定流体に発生する起電力ならびに前記
磁界の磁束密度を検出するサーチコイルに発生する起電
力を出力する検出器と、前記検出器の出力した前記各起
電力について変換ならびに演算を行なって前記被測定流
体の流量に相当する信号を得るようにした変換器とから
なる電磁流量計の、前記変換器を校正する装置において
、商用周波数の正弦波電圧を発生する正弦波発生器と、
矩形波電圧が入力されて前記矩形波電圧の微分値に相当
する電圧を出力する微分パルス発生器と、前記正弦波発
生器の出力電圧と前記微分パルス発生器の出力電圧とを
切換えて出力する切換スイッチと、前記切換スイッチの
出力電圧について変換ならびに演算を行なって前記被測
定流体および前記サーチコイの各々に発生した前記起電
力のそれぞれに相当する校正電圧および比較電圧を出力
する出力回路とを備えたことを特徴とする電磁流量計の
変換器の校正装置。A detector that applies a magnetic field to a fluid to be measured and outputs an electromotive force generated in the fluid to be measured based on the Faraday electromagnetic induction side and an electromotive force generated in a search coil that detects the magnetic flux density of the magnetic field; A device for calibrating a transducer of an electromagnetic flowmeter comprising a transducer that converts and calculates each of the electromotive forces outputted by the electromotive force to obtain a signal corresponding to the flow rate of the fluid to be measured. a sine wave generator that generates a sine wave voltage at a frequency;
a differential pulse generator that receives a rectangular wave voltage and outputs a voltage corresponding to a differential value of the rectangular wave voltage; and a differential pulse generator that switches and outputs the output voltage of the sine wave generator and the output voltage of the differential pulse generator. A changeover switch; and an output circuit that converts and calculates the output voltage of the changeover switch and outputs a calibration voltage and a comparison voltage corresponding to the electromotive force generated in each of the fluid to be measured and the search coil. A calibration device for a converter of an electromagnetic flowmeter, which is characterized by: