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Answer Posted / suresh m (fcri)
In most pressure switches, the set-point is adjustable.
During calibration, pressure is applied slowly near the set-
point, and usually a continuous reading Reference sensor
(or a calibrated dial-gauge)is used. During increasing
pressure, when set-point is reached (or crossed), if the
switch does not show contact change, then the knob (or
spring / bolt) is adjusted for correct action.
The test is repeated to confirm the switching of contacts
at desired pressure.
The pressure is raised slowly to a value above the set-
point during the test even as we observe switch-over
pressure. Later the switch change-over back to initial
state is also confirmed as we lower the pressure below the
set-point pressure.
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