GB1386082A - Fluid pressure transducers - Google Patents

Fluid pressure transducers

Info

Publication number
GB1386082A
GB1386082A GB821671A GB821671A GB1386082A GB 1386082 A GB1386082 A GB 1386082A GB 821671 A GB821671 A GB 821671A GB 821671 A GB821671 A GB 821671A GB 1386082 A GB1386082 A GB 1386082A
Authority
GB
United Kingdom
Prior art keywords
attached
moving electrode
bellows
lever
arm
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
GB821671A
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
Joseph Lucas Industries 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 Lucas Industries Ltd, Joseph Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB821671A priority Critical patent/GB1386082A/en
Priority to US00237023A priority patent/US3723926A/en
Priority to FR7210935A priority patent/FR2130729B1/fr
Priority to IT49199/72A priority patent/IT954390B/en
Priority to DE19722214751 priority patent/DE2214751A1/en
Publication of GB1386082A publication Critical patent/GB1386082A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • G01L11/004—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by the use of counterbalancing forces
    • G01L11/008—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by the use of counterbalancing forces electrostatic or electromagnetic counterbalancing forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
    • G01L9/0038—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means using variations in capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/12—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures

Abstract

1386082 Measuring pressure electrically JOSEPH LUCAS (INDUSTRIES) Ltd 17 March 1972 [26 March 1971] 8216/71 Heading G1N [ Also in Division H1] In a force balancing arrangement for measuring pressure, a bellows 20 Fig. 3, subjected to the test pressure externally or internally or both, for measuring differential pressure, is attached to the central, moving electrode 35 of a differential capacitor, the change in capacitance being measured in a bridge circuit Fig. 9 to produce a corresponding direct current which is fed to an electromagnetic force applying device 24 which restores the bellows and the moving electrode substantially to their normal positions. The assembly is mounted on three inter-connected fixed members 10, 11, 12. One end of the bellows 20 is attached by plug 21 to bracket member 12, and the other end is attached by plug 22 to an arm 16 and by a flexible strip 19 to a lever 15. The moving electrode 35 of the differential capacitor is bolted to arm 16, the fixed electrodes 30, 31 are mounted on a spacer 29, leaving a gap between them for the moving electrode 35, and spacer 29 is mounted on the frame member 10. The electromagnetic force applying device 24 comprises a core 25, shaped as a spool to carry two primary and two secondary windings, which is secured to the frame 10 by three bolts 28 arranged equi-angularly round a captive ball 26, whereby the orientation of core 25 can be adjusted. Surrounding the core is a tubular armature 23 rigidly attached to lever 15. Intermediate bracket member 11 is attached by crossed leaf hinges 18 to lever 15 at one end and by similar hinges 17 to arm 16 at the other end 11a, whereby bracket 11 acts as a pivotal support for lever 15 and arm 16 about spaced parallel axes. The differential capacitor comprising electrodes 30, 31, 35 is connected in a bridge circuit Fig. 9 with inductors 42, 43, energised by an oscillator 40. A pressure change on bellows 20 produces movement of central electrode 35 which unbalances the bridge, the unbalance voltage being amplified by transistors 51, 52 and phase rectified by components 56 to 65, further amplified by transistors 68, 72 and fed to opposed half windings 75, 76 of the force applying device 24. Two further half windings 82, 83 are fed with a constant D.C. from source 84 to polarize the core 25. Thus the device 24 substantially restores the moving electrode 35 to its normal position, and the current in windings 75, 76 to do this is measured across resistor 77 and is proportional to the test pressure.
GB821671A 1971-03-26 1971-03-26 Fluid pressure transducers Expired GB1386082A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB821671A GB1386082A (en) 1971-03-26 1971-03-26 Fluid pressure transducers
US00237023A US3723926A (en) 1971-03-26 1972-03-22 Fluid pressure transducers
FR7210935A FR2130729B1 (en) 1971-03-26 1972-03-23
IT49199/72A IT954390B (en) 1971-03-26 1972-03-24 ELECTROMAGNETIC FORCE APPLICATION DEVICE AND TRANSDUCER INCLUDING IT
DE19722214751 DE2214751A1 (en) 1971-03-26 1972-03-25 Electromagnetic force exerting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB821671A GB1386082A (en) 1971-03-26 1971-03-26 Fluid pressure transducers

Publications (1)

Publication Number Publication Date
GB1386082A true GB1386082A (en) 1975-03-05

Family

ID=9848151

Family Applications (1)

Application Number Title Priority Date Filing Date
GB821671A Expired GB1386082A (en) 1971-03-26 1971-03-26 Fluid pressure transducers

Country Status (5)

Country Link
US (1) US3723926A (en)
DE (1) DE2214751A1 (en)
FR (1) FR2130729B1 (en)
GB (1) GB1386082A (en)
IT (1) IT954390B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6477404B1 (en) 2000-03-01 2002-11-05 Cardiac Pacemakers, Inc. System and method for detection of pacing pulses within ECG signals
US6684102B1 (en) 2000-11-03 2004-01-27 Cardiac Pacemakers, Inc. Implantable heart monitors having capacitors with endcap headers
US6699265B1 (en) * 2000-11-03 2004-03-02 Cardiac Pacemakers, Inc. Flat capacitor for an implantable medical device
US6571126B1 (en) 2000-11-03 2003-05-27 Cardiac Pacemakers, Inc. Method of constructing a capacitor stack for a flat capacitor
US7456077B2 (en) * 2000-11-03 2008-11-25 Cardiac Pacemakers, Inc. Method for interconnecting anodes and cathodes in a flat capacitor
US6509588B1 (en) 2000-11-03 2003-01-21 Cardiac Pacemakers, Inc. Method for interconnecting anodes and cathodes in a flat capacitor
US6687118B1 (en) 2000-11-03 2004-02-03 Cardiac Pacemakers, Inc. Flat capacitor having staked foils and edge-connected connection members
US7107099B1 (en) * 2000-11-03 2006-09-12 Cardiac Pacemakers, Inc. Capacitor having a feedthrough assembly with a coupling member
US6833987B1 (en) 2000-11-03 2004-12-21 Cardiac Pacemakers, Inc. Flat capacitor having an active case
US7355841B1 (en) * 2000-11-03 2008-04-08 Cardiac Pacemakers, Inc. Configurations and methods for making capacitor connections
US6522525B1 (en) 2000-11-03 2003-02-18 Cardiac Pacemakers, Inc. Implantable heart monitors having flat capacitors with curved profiles
US7951479B2 (en) 2005-05-11 2011-05-31 Cardiac Pacemakers, Inc. Method and apparatus for porous insulative film for insulating energy source layers
US7479349B2 (en) * 2002-12-31 2009-01-20 Cardiac Pacemakers, Inc. Batteries including a flat plate design
US7224575B2 (en) 2004-07-16 2007-05-29 Cardiac Pacemakers, Inc. Method and apparatus for high voltage aluminum capacitor design

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB278673A (en) * 1926-10-05 1928-03-08 Michael Surjaninoff Electromagnet energised by polyphase currents
DE667066C (en) * 1934-08-23 1938-11-03 Siemens Schuckertwerke Akt Ges Electromagnet
FR897339A (en) * 1942-02-21 1945-03-19 Askania Werke Ag Motor magnet for control or regulation devices
US3389355A (en) * 1964-06-05 1968-06-18 Fred Schroeder Jr. Multiple coil solenoid
US3373343A (en) * 1965-11-24 1968-03-12 Johnson Service Co Pressure-electric transducers with performance stabilization
US3460081A (en) * 1967-05-31 1969-08-05 Marotta Valve Corp Electromagnetic actuator with permanent magnets
US3663911A (en) * 1971-04-22 1972-05-16 Pickering & Co Inc Variable scale differential transformer

Also Published As

Publication number Publication date
DE2214751A1 (en) 1972-10-12
IT954390B (en) 1973-08-30
FR2130729B1 (en) 1974-08-02
FR2130729A1 (en) 1972-11-03
US3723926A (en) 1973-03-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee