100P Enclosure 7 Adjustable Pressure Switch
Page 9
CAUTION
5.
Rock the appropriate handle back and forth, to rotate the
adjustment nut to increase or decrease load on the internal
adjustment spring. The silver-colored range scale, visible past
the end of the adjustment nut, gives an approximate value of
the increasing setpoint. For precise adjustment of the
increasing or decreasing setpoint, check the setpoints with a
calibrated pressure gauge.
6.
To check the setpoint, connect a pressure source (and a
calibrated pressure gauge if desired) to the pressure port and
slowly apply increasing pressure until the switch actuates.
Actuation can be noted by listening to the audible snap of the
Belleville spring, or with an ohmmeter across the appropriate
terminals of the terminal block.
7.
If you want to check the decreasing setpoint, slowly decrease
the pressure after the switch has actuated and note the
pressure at which the audible snap or ohmmeter indicates
deactuation. Deadband may be calculated if desired by
subtracting the decreasing setpoint pressure from the
increasing setpoint pressure.
Replace the cover onto the unit and tighten it until it is snug
against the O-ring. Do not overtighten the cover, as this can
make it difficult to remove later.
8.
Tighten the setscrew.