Global Patent Index - EP 0985139 A1

EP 0985139 A1 2000-03-15 - DIFFERENTIAL PRESSURE TRANSDUCER

Title (en)

DIFFERENTIAL PRESSURE TRANSDUCER

Title (de)

DIFFERENTIELLER DRUCKMESSUMFORMER

Title (fr)

TRANSDUCTEUR DE PRESSION DIFFERENTIELLE

Publication

EP 0985139 A1 (DE)

Application

EP 99910072 A

Priority

  • EP 99910072 A
  • CH 9900136 W
  • EP 98810282 A

Abstract (en)

[origin: EP0947815A1] A micro-engineered differential pressure transducer (100) with a housing enclosing a measurement chamber having a membrane (150) which includes a magnetic layer and divides the chamber into a first pressure sensing cavity (111) and a second pressure sensing cavity (112). On either side of , and spaced apart from, the membrane assembly are positioned flat coils (121;122), each connected into an external electrical measurement circuit. A relative change in pressure between the two sensing cavities effects deflection of the membrane assembly from its rest position causing electrical currents, of proportional magnitudes to the deflection and the pressure difference, to flow in the coils. The external circuit may contain a differential oscillator. Corrosion resistant membrane materials include: polytetrafluorethylene, ethylenetetrafluorethylene, polyethylenecotrifluorethylene, perfluoralkoxypolymers, polyvinylidene fluoride, and copolymers of tetrafluoromethylene / hexa fluoropropylene and polyethylene, various polyesters, and stainless steel. The magnetic elements may be soft ferromagnetic type e.g. amorphous metal, nickel-iron alloys, silicon iron, iron, ferrite, and silicon-iron-aluminium; or, hard material e.g. aluminium-nickel, aluminium-nickel-cobalt, rare earth, neodymium-iron-boron, neodymium-iron-cobalt, or hard ferrite, etc. A typical flat coil has a diameter of approx. 11 mm, and is wound from 50 microns diameter, gold plated wire.

IPC 1-7 (main, further and additional classification)

G01L 9/00

IPC 8 full level (invention and additional information)

G01L 13/06 (2006.01); G01L 9/00 (2006.01)

CPC (invention and additional information)

G01L 9/007 (2013.01)

Citation (search report)

See references of WO 9950633A1

Designated contracting state (EPC)

AT BE CH DE DK FR GB IE IT LI

EPO simple patent family

EP 0947815 A1 19991006; CA 2291103 A1 19991007; EP 0985139 A1 20000315; JP 2002501621 A 20020115; US 6484586 B1 20021126; WO 9950633 A1 19991007

INPADOC legal status


2003-06-25 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20021224

2002-07-24 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020611

2001-11-14 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: BOURDON-HAENNI HOLDING AG

2000-03-15 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991229

2000-03-15 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE DK FR GB IE IT LI