Fluid pressure measuring device

Abstract

Abstract 1507692 Fluid-pressure measurement SOC INTERNATIONALE DE MECANIQUE INDUSTRIELLE SA 19 May 1975 [22 May 1974] 21242/75 Heading G1N A fluid-pressure measuring device comprises a chamber for receiving the fluid and delimited by a pressure-sensitive flexible membrane 5, a support rod 7 movable with the membrane 5, a ferromagnetic core 10 adjustably mounted on the rod 7 and a magnetoresistor 13 arranged adjacent the path of travel of the core 10 and immersed in a permanent magnetic field, the arrangement being such that movement of the core 10 due to pressure changes in the chamber changes the magnetic flux of the magnetic field. As shown the field is provided by a permanent magnet 12, two magnetoresistors 13 coupled in a bridge 'circuit' being screwed thereto or embedded therein. The core 10 is slidably guided in a cylinder 11 of non-magnetic material and the rod 7 is non-rotatably guided in the body of the device. The electronic circuit 14 for processing the signals in the magnetoresistors is fixed to a plate 15. The circuit further comprises a series of ohmic resistors which are normally short circuited by a comb structure (Fig. 4, not shown) but should a specific resistance be required on the circuit one or more of the teeth of the comb may be broken off to bring the resistor associated therewith into circuit.

Inventors

No inventors recorded.

Bibliographic Details