JPS60190873A - Electromagnetic type conductivity meter - Google Patents

Electromagnetic type conductivity meter

Info

Publication number
JPS60190873A
JPS60190873A JP4613384A JP4613384A JPS60190873A JP S60190873 A JPS60190873 A JP S60190873A JP 4613384 A JP4613384 A JP 4613384A JP 4613384 A JP4613384 A JP 4613384A JP S60190873 A JPS60190873 A JP S60190873A
Authority
JP
Japan
Prior art keywords
oscillator
frequency
amplifier
resonance circuit
condenser
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
JP4613384A
Other versions
JPH0465987B2 (en
Inventor
Hajime Hasegawa
Yuji Ogawa
Tei Saito
Original Assignee
Japan Organo Co Ltd
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 Japan Organo Co Ltd filed Critical Japan Organo Co Ltd
Priority to JP4613384A priority Critical patent/JPH0465987B2/ja
Publication of JPS60190873A publication Critical patent/JPS60190873A/en
Publication of JPH0465987B2 publication Critical patent/JPH0465987B2/ja
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Abstract

PURPOSE: To make it possible to stably measure conductivity up to a lower degree, by forming a resonance circuit by connecting a condenser to a detection coil and performing the positive feedback of the resonant voltage thereof to draw the frequency of an oscillator in resonance frequency.
CONSTITUTION: An electromagnetic induction current is flowed to a water loop by exciting a magnetic core W1 by the output of an oscillator to induce electromotive force in a detection coil L2. A condenser C5 is connected to the coil L2 to form a resonance circuit and the resonant voltage thereof is supplied to a DC ammeter A through an amplifier Q1 and a detector D1. In this case, the output voltage of the amplifier Q1 is positively fed back to the oscillator through an amplifier Q2 and the oscillation frequency of the oscillator is dawn in the frequency of the resonance circuit consisting of L2 and C5 to eliminate the difference between both frequencies. Therefore, detection can be performed always in a stable state with high sensitivity.
COPYRIGHT: (C)1985,JPO&Japio
JP4613384A 1984-03-10 1984-03-10 Expired - Lifetime JPH0465987B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4613384A JPH0465987B2 (en) 1984-03-10 1984-03-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4613384A JPH0465987B2 (en) 1984-03-10 1984-03-10

Publications (2)

Publication Number Publication Date
JPS60190873A true JPS60190873A (en) 1985-09-28
JPH0465987B2 JPH0465987B2 (en) 1992-10-21

Family

ID=12738478

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4613384A Expired - Lifetime JPH0465987B2 (en) 1984-03-10 1984-03-10

Country Status (1)

Country Link
JP (1) JPH0465987B2 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS631961A (en) * 1986-05-30 1988-01-06 Cobe Lab Remote sensor for conductivity
US5089781A (en) * 1990-02-13 1992-02-18 Tosoh Corporation Electromagnetic conductivity meter and a conductivity measuring method
US5510716A (en) * 1992-09-30 1996-04-23 Cobe Laboratories, Inc. Differential conductivity recirculation monitor
US5631552A (en) * 1992-09-30 1997-05-20 Cobe Laboratories, Inc. Hemodynamic monitor for detecting air bubbles
US5813408A (en) * 1991-12-03 1998-09-29 Boston Scientific Technology, Inc. Surgical drape
US5900726A (en) * 1992-09-30 1999-05-04 Cobe Laboratories, Inc. Differential conductivity hemodynamic monitor
US6189388B1 (en) 1997-11-12 2001-02-20 Gambro, Inc. Access flow monitoring using reversal of normal blood flow
US6726647B1 (en) 1998-10-23 2004-04-27 Gambro Ab Method and device for measuring access flow
JP2014149283A (en) * 2013-02-04 2014-08-21 Horiba Advanced Techno Co Ltd Conductivity measuring instrument and correcting method for measurement values therefrom
JP2014224770A (en) * 2013-05-16 2014-12-04 学校法人東京理科大学 Electrical characteristics measurement device, electrical characteristics measuring method, and program

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS631961A (en) * 1986-05-30 1988-01-06 Cobe Lab Remote sensor for conductivity
US5089781A (en) * 1990-02-13 1992-02-18 Tosoh Corporation Electromagnetic conductivity meter and a conductivity measuring method
US5813408A (en) * 1991-12-03 1998-09-29 Boston Scientific Technology, Inc. Surgical drape
US5510717A (en) * 1992-09-30 1996-04-23 Cobe Laboratories, Inc. Differential conductivity recirculation monitor
US5570026A (en) * 1992-09-30 1996-10-29 Cobe Laboratories, Inc. Altered fluid conductivity monitor
US5631552A (en) * 1992-09-30 1997-05-20 Cobe Laboratories, Inc. Hemodynamic monitor for detecting air bubbles
US6614212B2 (en) 1992-09-30 2003-09-02 Gambro, Inc. Differential conductivity hemodynamic monitor
US5900726A (en) * 1992-09-30 1999-05-04 Cobe Laboratories, Inc. Differential conductivity hemodynamic monitor
US5510716A (en) * 1992-09-30 1996-04-23 Cobe Laboratories, Inc. Differential conductivity recirculation monitor
US6912917B2 (en) 1992-09-30 2005-07-05 Gambro, Inc. Differential fluid parameter determination
US6452371B1 (en) 1992-09-30 2002-09-17 Gambro, Inc. Differential conductivity hemodynamic monitor
US6075367A (en) * 1992-09-30 2000-06-13 Gambro, Inc. Differential conductivity hemodynamic monitor
US6189388B1 (en) 1997-11-12 2001-02-20 Gambro, Inc. Access flow monitoring using reversal of normal blood flow
US6726647B1 (en) 1998-10-23 2004-04-27 Gambro Ab Method and device for measuring access flow
US7500958B2 (en) 1998-10-23 2009-03-10 Gambro Lundia Ab Switch valve for an extracorporeal blood circuit and circuit including such a switch valve
JP2014149283A (en) * 2013-02-04 2014-08-21 Horiba Advanced Techno Co Ltd Conductivity measuring instrument and correcting method for measurement values therefrom
JP2014224770A (en) * 2013-05-16 2014-12-04 学校法人東京理科大学 Electrical characteristics measurement device, electrical characteristics measuring method, and program

Also Published As

Publication number Publication date
JPH0465987B2 (en) 1992-10-21

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