METROLOGY & MEASUREMENTS
35
An unlimited supply of liquid is required on the upstream to measure static differential pressure with this type of pickup. Since this is impractical, finite amount of liquid is constrained within the electrokinetic cell. i.e. the device is used for dynamic rather than static pressure measurements. • • • •
Fig. shows a typical electrokinetic cell. It consists of a porous porcelain disc fitted into the center of an impermeable porcelain ring. The diaphragms are tightly sealed on either side to retain the polar liquid, which fills the space between the diaphragms. A wire mesh electrode is mounted on either side of the porous disc, with electrical connections via the aluminium strips. The whole assembly is fitted in a suitable housing.
Applications: Measurement of small dynamic displacements, pressure & acceleration. Limitations: Can not be used for measurement of static quantities.
FOR MORE DETAILS VISIT US ON WWW.IMTSINSTITUTE.COM OR CALL ON +91-9999554621