GB2003274A - Compensating for fluid channel dimension variations in a flowmeter - Google Patents

Compensating for fluid channel dimension variations in a flowmeter

Info

Publication number
GB2003274A
GB2003274A GB7831704A GB7831704A GB2003274A GB 2003274 A GB2003274 A GB 2003274A GB 7831704 A GB7831704 A GB 7831704A GB 7831704 A GB7831704 A GB 7831704A GB 2003274 A GB2003274 A GB 2003274A
Authority
GB
United Kingdom
Prior art keywords
flow rate
compensating
channels
flowmeter
differential
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
GB7831704A
Other versions
GB2003274B (en
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.)
REPGREEN Ltd
Original Assignee
REPGREEN 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 REPGREEN Ltd filed Critical REPGREEN Ltd
Priority to GB7831704A priority Critical patent/GB2003274B/en
Publication of GB2003274A publication Critical patent/GB2003274A/en
Application granted granted Critical
Publication of GB2003274B publication Critical patent/GB2003274B/en
Expired 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
    • A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
    • 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
    • G01F1/584—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 constructions of electrodes, accessories therefor
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Urology & Nephrology (AREA)
  • Vascular Medicine (AREA)
  • Emergency Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring Volume Flow (AREA)

Abstract

A flowmeter for measuring small differential fluid flow rates, of dialysate input to and output from a dialyser, comprises two similar, rectangular section channels 11, 12 and a compensating or calibrating circuit eliminating the effects of variations in the channel heights or "diameters". The channels are in a magnetic field H, so that the flow of dialysate generates an e.m.f. between electrodes 13 and 14 in the channels, which is representative of the differential flow rate. The compensating for channel height mismatch is effected by using a signal proportional to common mode flow rate from electrodes 15 and 16, which is amplified by a factor whose ratio to the differential flow rate signal amplification factor is proportional to channel height mismatch, and summing the two amplified signals. The common mode flow rate amplification factor is determinable by a calibration procedure. A suitable circuit is disclosed (Figs 6 and 7 not shown). <IMAGE>
GB7831704A 1977-07-12 1978-07-31 Measurement method and apparatus Expired GB2003274B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7831704A GB2003274B (en) 1977-07-12 1978-07-31 Measurement method and apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2099877 1977-07-12
GB7831704A GB2003274B (en) 1977-07-12 1978-07-31 Measurement method and apparatus

Publications (2)

Publication Number Publication Date
GB2003274A true GB2003274A (en) 1979-03-07
GB2003274B GB2003274B (en) 1982-02-24

Family

ID=26255038

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7831704A Expired GB2003274B (en) 1977-07-12 1978-07-31 Measurement method and apparatus

Country Status (1)

Country Link
GB (1) GB2003274B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469928A1 (en) * 1979-11-23 1981-05-29 Thomasset Auguste APPARATUS FOR THE CONTROL OF HEMODIALYSIS SESSIONS
EP0106940A2 (en) * 1982-09-28 1984-05-02 Gambro Lundia AB An arrangement for the measurement of the difference between two flows in two separate ducts
EP0122604A1 (en) * 1983-04-13 1984-10-24 Fresenius AG Apparatus for regulating ultrafiltration rate
EP0204174A2 (en) * 1985-06-04 1986-12-10 Gambro Ab A system for the control of dialysis
WO1995022743A1 (en) * 1994-02-18 1995-08-24 Gambro Ab System and method for monitoring a fluid flow in a dialysis machine
DE102010003642A1 (en) 2010-03-15 2011-09-15 Fresenius Medical Care Deutschland Gmbh Cassette with a sensor for determining the difference between a first and a second liquid flow
WO2013164089A1 (en) 2012-05-04 2013-11-07 Fresenius Medical Care Deutschland Gmbh Balancing device, dialysis device, extracorporeal circuit, and method for balancing liquids using a flow measuring cell
DE102015001406B3 (en) * 2015-02-04 2016-07-14 Fresenius Medical Care Deutschland Gmbh Cassette module for a differential flow meter and differential flow meter
DE102020102485A1 (en) 2020-01-31 2021-08-05 Fresenius Medical Care Deutschland Gmbh Flow sensor and method for measuring a flow

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021087683A1 (en) * 2019-11-04 2021-05-14 深圳市大疆创新科技有限公司 Electromagnetic flowmeter, spray device and movable platform

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469928A1 (en) * 1979-11-23 1981-05-29 Thomasset Auguste APPARATUS FOR THE CONTROL OF HEMODIALYSIS SESSIONS
EP0029793A1 (en) * 1979-11-23 1981-06-03 Auguste Louis Thomasset Device for the control of a hemodialysis treatment
EP0106940A2 (en) * 1982-09-28 1984-05-02 Gambro Lundia AB An arrangement for the measurement of the difference between two flows in two separate ducts
EP0106940A3 (en) * 1982-09-28 1984-07-18 Gambro Lundia Ab An arrangement for the measurement of the difference between two flows in two separate ducts
US4585552A (en) * 1982-09-28 1986-04-29 Gambro Lundia Ab System for the measurement of the difference between two fluid flows in separate ducts
EP0122604A1 (en) * 1983-04-13 1984-10-24 Fresenius AG Apparatus for regulating ultrafiltration rate
EP0204174A2 (en) * 1985-06-04 1986-12-10 Gambro Ab A system for the control of dialysis
EP0204174A3 (en) * 1985-06-04 1988-03-16 Gambro Ab A system for the control of dialysis
US4762618A (en) * 1985-06-04 1988-08-09 Gambro Ab Apparatus and method for controlling fluid flow in dialysis and the like
WO1995022743A1 (en) * 1994-02-18 1995-08-24 Gambro Ab System and method for monitoring a fluid flow in a dialysis machine
US5792367A (en) * 1994-02-18 1998-08-11 Gambro Ab System and method for monitoring a flow of dialysis fluid in a dialysis machine
WO2011113838A1 (en) 2010-03-15 2011-09-22 Fresenius Medical Care Deutschland Gmbh Cartridge having a sensor for determining the difference between a first liquid flow and a second liquid flow
US10260682B2 (en) 2010-03-15 2019-04-16 Fresenius Medical Care Deutschland Gmbh Cassette with a sensor for determining the difference between a first and a second fluid stream
CN102844057A (en) * 2010-03-15 2012-12-26 弗雷森纽斯医疗护理德国有限责任公司 A cartridge having a sensor for determining the difference between a first liquid flow and a second liquid flow
US11085588B2 (en) 2010-03-15 2021-08-10 Fresenius Medical Care Deutschland Gmbh Cassette with a sensor for determining the difference between a first and a second fluid stream
DE102010003642A1 (en) 2010-03-15 2011-09-15 Fresenius Medical Care Deutschland Gmbh Cassette with a sensor for determining the difference between a first and a second liquid flow
CN102844057B (en) * 2010-03-15 2015-09-30 弗雷森纽斯医疗护理德国有限责任公司 There is the box body of the sensor of the difference determined between the first and second fluid streams
EP3372261A1 (en) 2010-03-15 2018-09-12 Fresenius Medical Care Deutschland GmbH Device for controlling/regulating the ultrafiltration rate in a dialysis device using a predetermined difference between a first liquid flow and a second liquid flow
US9399089B2 (en) 2010-03-15 2016-07-26 Fresenius Medical Care Deutschland Gmbh Cassette with a sensor for determining the difference between a first and a second fluid stream
DE102012009043A1 (en) 2012-05-04 2013-11-07 Fresenius Medical Care Deutschland Gmbh Balancing device, dialysis machine, extracorporeal circuit and method for balancing liquids with a flow cell
WO2013164089A1 (en) 2012-05-04 2013-11-07 Fresenius Medical Care Deutschland Gmbh Balancing device, dialysis device, extracorporeal circuit, and method for balancing liquids using a flow measuring cell
WO2016124527A1 (en) * 2015-02-04 2016-08-11 Fresenius Medical Care Deutschland Gmbh Flowmeter and cassette module for a flowmeter
DE102015001406B3 (en) * 2015-02-04 2016-07-14 Fresenius Medical Care Deutschland Gmbh Cassette module for a differential flow meter and differential flow meter
US10345127B2 (en) 2015-02-04 2019-07-09 Fresenius Medical Care Deutschland Gmbh Flowmeter and cassette module for a flowmeter
DE102020102485A1 (en) 2020-01-31 2021-08-05 Fresenius Medical Care Deutschland Gmbh Flow sensor and method for measuring a flow

Also Published As

Publication number Publication date
GB2003274B (en) 1982-02-24

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19980730