JPS56129816A - Electromagnetic flowmeter - Google Patents

Electromagnetic flowmeter

Info

Publication number
JPS56129816A
JPS56129816A JP3366880A JP3366880A JPS56129816A JP S56129816 A JPS56129816 A JP S56129816A JP 3366880 A JP3366880 A JP 3366880A JP 3366880 A JP3366880 A JP 3366880A JP S56129816 A JPS56129816 A JP S56129816A
Authority
JP
Japan
Prior art keywords
circuit
turned
driving signal
exciting coil
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3366880A
Other languages
Japanese (ja)
Inventor
Ichiu Suzuki
Hitoshi Akiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokogawa Electric Corp
Original Assignee
Hokushin Electric Works Ltd
Yokogawa Hokushin Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hokushin Electric Works Ltd, Yokogawa Hokushin Electric Corp filed Critical Hokushin Electric Works Ltd
Priority to JP3366880A priority Critical patent/JPS56129816A/en
Publication of JPS56129816A publication Critical patent/JPS56129816A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/60—Circuits therefor

Abstract

PURPOSE:To make the circuit for an electromagnetic flowmeter simpler, cheaper as well as highly reliable by inserting a short circuit preventing circuit between the driving circuit for the switching transistors which alternately operate to reverse the direction of the current to flow through an exciting coil and the driving signal source. CONSTITUTION:When a positive driving signal is applied by a driving signal circuit 23, being delayed according to the time constant (t) of a short circuit preventing circuit 37 comprising a resistor 47 and a capacitor 48, an NPN type transistor (Tr) 18 conducts, and consequently, a switching transistor is turned on, so that a positive exciting current is allowed to flow through an exciting coil 13 from a power source 11. On the other hand, a PNP type transistor 21 is brought to a non- conducting state, and consequently, a switching transistor 16 is turned off with the falling characteristics shorter than tau. When the driving signal is negative, similarly, Tr16 is turned on, while Tr12 is turned off with the falling characteristics shorter than tau, so that a negative current from the power source 15 flows through the exciting coil 13. Tr 12 and Tr16 never be turned on at the same time. Thereby, the circuit can be made simpler, cheaper as well as highly reliable.
JP3366880A 1980-03-17 1980-03-17 Electromagnetic flowmeter Pending JPS56129816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3366880A JPS56129816A (en) 1980-03-17 1980-03-17 Electromagnetic flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3366880A JPS56129816A (en) 1980-03-17 1980-03-17 Electromagnetic flowmeter

Publications (1)

Publication Number Publication Date
JPS56129816A true JPS56129816A (en) 1981-10-12

Family

ID=12392833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3366880A Pending JPS56129816A (en) 1980-03-17 1980-03-17 Electromagnetic flowmeter

Country Status (1)

Country Link
JP (1) JPS56129816A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0736721U (en) * 1993-12-22 1995-07-11 八重子 仁木 Cane with attachment
JP2014169871A (en) * 2013-03-01 2014-09-18 Azbil Corp Excitation circuit of electromagnetic flow meter
JP2014194393A (en) * 2013-03-29 2014-10-09 Azbil Corp Excitation circuit of electromagnetic flow meter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0736721U (en) * 1993-12-22 1995-07-11 八重子 仁木 Cane with attachment
JP2014169871A (en) * 2013-03-01 2014-09-18 Azbil Corp Excitation circuit of electromagnetic flow meter
JP2014194393A (en) * 2013-03-29 2014-10-09 Azbil Corp Excitation circuit of electromagnetic flow meter

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