43 Field Instrumentation GEN Rev)
Reluctive pressure transducer
Linear variable differential transformer (LVDT) pressure Transducer Change in pressure causes the bellow to expand or contract, which moves a magnetic core inside a primary and two secondary coils. The output voltage from this device varies in proportion to the position of the core. The LVDT is often used to convert a pneumatic signal to a proportional electrical signal. Linear variable differential transformer (LVDT) pressure Transducer
44 Field Instrumentation GEN Rev)
Strain gauge pressure transducers A strain gauge changes its electrical resistance as it is stretched and relaxed. It can be attached to a pressure-sensing diaphragm. When diaphragm flexes, the strain
gauge stretches or relaxes, in turn converting pressure changes to electrical changes. Strain gauges are all force balance devices. Strain gauge pressure transducers The
metal wire strain gauge is made of very fine wire. The wire is fastened to a pressure diaphragm or other flexing element. Ab semiconductor strain gauge is connected to an electronic circuit to indicate pressure. It is classified into two types.
P-type: resistance increases directly with applied strain or pressure.
N-type: resistance decreases as applied strain or pressure increases.
45 Field Instrumentation GEN Rev) Strain gauge pressure transducers
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