JPH02143121A - Electromagnetic flowmeter - Google Patents

Electromagnetic flowmeter

Info

Publication number
JPH02143121A
JPH02143121A JP29890188A JP29890188A JPH02143121A JP H02143121 A JPH02143121 A JP H02143121A JP 29890188 A JP29890188 A JP 29890188A JP 29890188 A JP29890188 A JP 29890188A JP H02143121 A JPH02143121 A JP H02143121A
Authority
JP
Japan
Prior art keywords
voltage
resistor
measuring tube
exciting coil
output
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.)
Granted
Application number
JP29890188A
Other languages
Japanese (ja)
Other versions
JP2751269B2 (en
Inventor
Takahiro Fudeyasu
Original Assignee
Shimadzu 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 Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP63298901A priority Critical patent/JP2751269B2/en
Publication of JPH02143121A publication Critical patent/JPH02143121A/en
Application granted granted Critical
Publication of JP2751269B2 publication Critical patent/JP2751269B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To effectively discriminate the existence of bad insulation in a detector by providing a voltage supply circuit to impress a power source voltage between a measuring tube and an exciting coil through a resistor, providing the detecting device for a terminal voltage of the resistor and comparing the detected output with a reference value.
CONSTITUTION: A series circuit of the resistor 13, switch 14 and DC high voltage source 15, which consists the voltage supply circuit, is connected between the measuring tube 1 and the exciting coil 3. When the switch 14 is turned on, a voltage of the high voltage source 15 is impressed between the exciting coil 3 and the measuring tube 1 through the resistor 13, and the voltage is generated between both ends of the resistor 13 in accordance with a current of this series circuit. Generally, the resistance between the exciting coil and the measuring tube is mostly higher than 100MΩ at the normal condition. So, if the voltage of the high voltage source 16 and the resistance value of the resistor 13 are assumed to be 100V, 1MΩ respectively for example, the condition that an insulation resistance is made to drop to lower than 100MΩ can be detected when the output from an amplifier 16 connected to the resistor 13 is boosted t larger than 100mV. The output of this amplifier 16 is converted into a digital signal in an A/D converter 17 through a multiplexer 12 and fetched to a CPU 8.
COPYRIGHT: (C)1990,JPO&Japio
JP63298901A 1988-11-25 1988-11-25 Electromagnetic flow meter Expired - Lifetime JP2751269B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63298901A JP2751269B2 (en) 1988-11-25 1988-11-25 Electromagnetic flow meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63298901A JP2751269B2 (en) 1988-11-25 1988-11-25 Electromagnetic flow meter

Publications (2)

Publication Number Publication Date
JPH02143121A true JPH02143121A (en) 1990-06-01
JP2751269B2 JP2751269B2 (en) 1998-05-18

Family

ID=17865629

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63298901A Expired - Lifetime JP2751269B2 (en) 1988-11-25 1988-11-25 Electromagnetic flow meter

Country Status (1)

Country Link
JP (1) JP2751269B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010085349A (en) * 2008-10-02 2010-04-15 Oval Corp Electromagnetic flowmeter and insulation resistance measuring method
WO2013137445A1 (en) * 2012-03-15 2013-09-19 アズビル株式会社 Excitation circuit for electromagnetic flow meter and electromagnetic flow meter
JP2016017945A (en) * 2014-07-11 2016-02-01 横河電機株式会社 Flow meter and electrical insulation deterioration diagnostic system
JP2016200415A (en) * 2015-04-07 2016-12-01 横河電機株式会社 Electromagnetic flowmeter and method for measuring flow rate of electromagnetic flowmeter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61139425U (en) * 1985-02-20 1986-08-29

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61139425U (en) * 1985-02-20 1986-08-29

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010085349A (en) * 2008-10-02 2010-04-15 Oval Corp Electromagnetic flowmeter and insulation resistance measuring method
WO2013137445A1 (en) * 2012-03-15 2013-09-19 アズビル株式会社 Excitation circuit for electromagnetic flow meter and electromagnetic flow meter
JP2013195064A (en) * 2012-03-15 2013-09-30 Azbil Corp Excitation circuit of electromagnetic flow meter
CN104169691A (en) * 2012-03-15 2014-11-26 阿自倍尔株式会社 Excitation circuit for electromagnetic flow meter and electromagnetic flow meter
US9267827B2 (en) 2012-03-15 2016-02-23 Azbil Corporation Electromagnetic flow meter excitation circuit and electromagnetic flow meter
CN104169691B (en) * 2012-03-15 2016-11-09 阿自倍尔株式会社 The field circuit of electromagnetic flowmeter and electromagnetic flowmeter
JP2016017945A (en) * 2014-07-11 2016-02-01 横河電機株式会社 Flow meter and electrical insulation deterioration diagnostic system
US9726526B2 (en) 2014-07-11 2017-08-08 Yokogawa Electric Corporation Flowmeter, insulation deterioration diagnosis system, and insulation deterioration diagnosis method
JP2016200415A (en) * 2015-04-07 2016-12-01 横河電機株式会社 Electromagnetic flowmeter and method for measuring flow rate of electromagnetic flowmeter

Also Published As

Publication number Publication date
JP2751269B2 (en) 1998-05-18

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