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GB1302727A - - Google Patents

Info

Publication number
GB1302727A
GB1302727A GB2894970A GB2894970A GB1302727A GB 1302727 A GB1302727 A GB 1302727A GB 2894970 A GB2894970 A GB 2894970A GB 2894970 A GB2894970 A GB 2894970A GB 1302727 A GB1302727 A GB 1302727A
Authority
GB
United Kingdom
Prior art keywords
flow
rate
thermistors
detector
conduit
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
GB2894970A
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
Priority claimed from FR6920031A external-priority patent/FR2049669A5/fr
Priority claimed from FR6920030A external-priority patent/FR2049668A5/fr
Application filed filed Critical
Publication of GB1302727A publication Critical patent/GB1302727A/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
    • G01F1/05—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 mechanical effects
    • G01F1/34—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 mechanical effects by measuring pressure or differential pressure
    • G01F1/36—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 mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/46—Pitot tubes
    • 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
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • 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
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow
    • 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)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Measuring Volume Flow (AREA)

Abstract

1302727 Measuring gas flow electrically CHARBONNAGES DE FRANCE 15 June 1970 [16 June 1969(2)] 28949/70 Heading G1N In apparatus for determining the flow-rate of methane in a mixture with air, a fraction of the flow is extracted at a lower rate of flow proportional to the flow-rate V in the conduit 1 carrying the gas mixture which fraction is passed over two detector thermistors in series-connection, one ThQ being downstream of an orifice 3 disposed in the flow whilst the other ThG is in a porous container 11 disposed at a place where the flow fraction is substantially stationary, the combined resistance of the two thermistors being compared with that of a reference Th R in a closed air-filled chamber 2 at the same ambient temperature and a signal S dependent on the value of electrical energy required to maintain the total resistance of the detector thermistors at a given value is used as a measure of the net flow-rate of pure methane in the conduit. In an alternative embodiment Fig.9 (not shown) a third detector thermistor (Th p ) is provided which compensates for the difference in temperature between atmosphere and the inside of the conduit. The prf of heating pulses to the detector thermistors is representative of the flow-rate of pure methane. The measuring circuit 13 is as described in Specification 1214266 (see Division G1) to which reference is made.
GB2894970A 1969-06-16 1970-06-15 Expired GB1302727A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR6920031A FR2049669A5 (en) 1969-06-16 1969-06-16
FR6920030A FR2049668A5 (en) 1969-06-16 1969-06-16

Publications (1)

Publication Number Publication Date
GB1302727A true GB1302727A (en) 1973-01-10

Family

ID=26215113

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2894970A Expired GB1302727A (en) 1969-06-16 1970-06-15

Country Status (3)

Country Link
BE (1) BE751279A (en)
DE (1) DE2028863A1 (en)
GB (1) GB1302727A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2311103C2 (en) * 1973-03-06 1984-01-12 Helmut Dipl.-Chem. 8000 München Ulrich Device for measuring the flow rate of a fluid
DE2444511C3 (en) * 1974-09-18 1981-07-30 Volkswagenwerk Ag, 3180 Wolfsburg Thermal flow meter for gaseous media

Also Published As

Publication number Publication date
DE2028863A1 (en) 1971-01-14
BE751279A (en) 1970-12-01

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee