
Mechanical spring Devices
 Cantilever
 Closedcoiled Helical spring
 Flat spiral spring

when subjected to Compressive force
the displacement is given by

when subjected to torque τ, the deflection angle in radians is given by

Convents force into displacement, deflection of free end is given by

Pressure Sensitive primary Devices

Diaphragms

whole series of mechanical devices that change shapes when force (pressure) applied to it
 Flat
 Corrugated

deflection ≈ 2% of diameter
 Bellows
 Bourden tubes

Flowrate sensing Elements

Differential Pressure meters
 orifice plate
 Venturi tube
 flow nozzle