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GB1109118A - Improvements in or relating to mass flow measuring devices - Google Patents

Improvements in or relating to mass flow measuring devices

Info

Publication number
GB1109118A
GB1109118A GB964564A GB964564A GB1109118A GB 1109118 A GB1109118 A GB 1109118A GB 964564 A GB964564 A GB 964564A GB 964564 A GB964564 A GB 964564A GB 1109118 A GB1109118 A GB 1109118A
Authority
GB
United Kingdom
Prior art keywords
gas
flow
thermistor
bridge
heater
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.)
Expired
Application number
GB964564A
Inventor
Ernest Frank Coles
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.)
Hawker Siddeley Dynamics Ltd
Original Assignee
Hawker Siddeley Dynamics 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 Hawker Siddeley Dynamics Ltd filed Critical Hawker Siddeley Dynamics Ltd
Priority to GB964564A priority Critical patent/GB1109118A/en
Priority to FR24886A priority patent/FR1451423A/en
Priority to DE19651498351 priority patent/DE1498351A1/en
Publication of GB1109118A publication Critical patent/GB1109118A/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
    • G01F1/68—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 thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

1,109,118. Measuring gas-flow electrically. HAWKER SIDDELEY DYNAMICS Ltd. July 13, 1965 [July 19, 1964], No.9645/64. Heading G1N. Apparatus for measuring the mass flow of a gas comprises a thermistor 2a (Fig. 1) in one arm of a bridge 1, electrically heated by an element 4 exposed to the gas-flow, the heater being fed with the bridge unbalance current, whereby an increase in the gas-flow reduces the temperature of thermistor 2a and unbalances the bridge, thereby feeding more current to the heater 4 to restore the bridge balance condition, the change in heater current, indicated at 7, representing the change in gas mass flow. As shown, five thermistors 2, 2a, 3 are connected in the bridge circuit and located in the gas-stream so that the bridge is insensitive to changes in the temperature of the gas. Thermistors 2 and 3 are thermally shielded from thermistor 2a and the heater 4. Thermistor 3 is connected in one arm in series with 2a to determine the heater current at zero gas-flow. In a modification, thermistor 3 is omitted and an A. C . voltage is added in the unbalance circuit to determine the initial heater current Fig. 6 (not shown). Thermistors 2 may be combined with or replaced by fixed resistors to produce the desired relationship between heater current and gas mass flow. The thermistors may be located in the main flow conduit or in a by-pass. In one embodiment Fig. 10 (not shown) a further thermistor in the gas-flow is used to control the gains of the unbalance amplifier to make the response independent of changes in the gas temperature.
GB964564A 1964-07-19 1964-07-19 Improvements in or relating to mass flow measuring devices Expired GB1109118A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB964564A GB1109118A (en) 1964-07-19 1964-07-19 Improvements in or relating to mass flow measuring devices
FR24886A FR1451423A (en) 1964-07-19 1965-07-16 Improvements in mass flow measurement devices
DE19651498351 DE1498351A1 (en) 1964-07-19 1965-07-19 Electric measuring device for flow rates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB964564A GB1109118A (en) 1964-07-19 1964-07-19 Improvements in or relating to mass flow measuring devices

Publications (1)

Publication Number Publication Date
GB1109118A true GB1109118A (en) 1968-04-10

Family

ID=9876002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB964564A Expired GB1109118A (en) 1964-07-19 1964-07-19 Improvements in or relating to mass flow measuring devices

Country Status (3)

Country Link
DE (1) DE1498351A1 (en)
FR (1) FR1451423A (en)
GB (1) GB1109118A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648518A (en) * 1969-02-07 1972-03-14 Rainer Hans Apparatus for measuring the flow volume of gases and liquids
US3735752A (en) * 1971-04-07 1973-05-29 J Rodder Spirometer
FR2439388A1 (en) * 1978-10-20 1980-05-16 Bosch Gmbh Robert INSTALLATION FOR MEASURING THE MASS OF A FLOWING FLUID

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE391036B (en) * 1973-12-03 1977-01-31 Elektronik Konstruktions Ab DEVICE FOR SATURATION AND / OR MONITORING THE FLOW SPEED OF A FLOWING MEDIUM
DE2849467C2 (en) * 1978-11-15 1982-12-30 Robert Bosch Gmbh, 7000 Stuttgart Control circuit for a constant temperature anemometer, especially for measuring the intake air of an internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648518A (en) * 1969-02-07 1972-03-14 Rainer Hans Apparatus for measuring the flow volume of gases and liquids
US3735752A (en) * 1971-04-07 1973-05-29 J Rodder Spirometer
FR2439388A1 (en) * 1978-10-20 1980-05-16 Bosch Gmbh Robert INSTALLATION FOR MEASURING THE MASS OF A FLOWING FLUID

Also Published As

Publication number Publication date
FR1451423A (en) 1966-01-07
DE1498351A1 (en) 1968-12-05

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