Pressure switches are designed from Vacuum to
pressure. The most important component for controlling pressure is
the sensing element. Pressure sensors for both metallic and
elastomer are suitable for most applications. Pressure sensorsare normally bellows, diaphragms and piston.
This works on force balance principle. Media pressure on the
sensing element contracts the force of the range spring
(adjustable by the adjusting nut) which moves the piston shaft
only a few thousandths of an inch to directly actuate the
electrical snap action switching element.