JPS6088220U

JPS6088220U - electromagnetic flowmeter converter

Info

Publication number: JPS6088220U
Application number: JP18061383U
Authority: JP
Inventors: 清田　敏雄; 俊広山本
Original assignee: 富士電機株式会社
Priority date: 1983-11-22
Filing date: 1983-11-22
Publication date: 1985-06-17
Also published as: JPH049552Y2

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 drawings]

第１図は本考案の一実施例の低周波励磁式電磁流量計の
概略ブロック図、第２図は第１図における信号および電
圧波形を含むタイムチャート、第３図は本考案の一実施
例の要部の概略ブロック図である。１：電磁流量計、２：検出器、３：変換器、５：励磁コ
イル、９：タイミング信号発生回路、１０：論理演算回
路、１６：絶縁トランス、１７：整流回路、１８：定電
圧回路、１９：ゼロクロスコンパレータ、２０：ＩＪシ
レー２１：発振回路、２２：タイミング回路。Fig. 1 is a schematic block diagram of a low frequency excitation type electromagnetic flowmeter according to an embodiment of the present invention, Fig. 2 is a time chart including the signal and voltage waveforms in Fig. 1, and Fig. 3 is an embodiment of the present invention. FIG. 1: Electromagnetic flowmeter, 2: Detector, 3: Converter, 5: Excitation coil, 9: Timing signal generation circuit, 10: Logic operation circuit, 16: Isolation transformer, 17: Rectifier circuit, 18: Constant voltage circuit, 19: Zero cross comparator, 20: IJ relay 21: Oscillation circuit, 22: Timing circuit.

Claims

[Scope of utility model registration request]

A low frequency excitation type electromagnetic device that measures the flow rate of the fluid by applying a nearly rectangular magnetic field with a frequency lower than the commercial power supply frequency to the fluid to be measured and detecting the electromotive force generated in the fluid based on the Faraday electromagnetic induction side. The electromagnetic flow meter is a flowmeter that receives a DC power source as an external power source, outputs an excitation current for forming the magnetic field, samples the electromotive force, and outputs the sampling result as a signal corresponding to the flow rate. In the meter converter, means for receiving an external commercial power source, a zero cross comparator for converting a frequency signal of the external commercial power source into a module pulse signal, a fixed frequency oscillation circuit for emitting a fixed frequency pulse, a frequency dividing circuit, and the above-mentioned When external commercial power is applied, the module pulses emitted from the zero-cross comparator are guided to the frequency divider, and when the external commercial power is not applied, the module pulses emitted from the fixed frequency oscillator circuit are guided to the frequency divider. and a switching means that is controlled to lead the frequency pulse to the frequency divider circuit, and creates sampling pulses of the excitation current and the electromotive force based on a timing signal generated by the frequency divider circuit. Electromagnetic flow meter converter.