SOR RT Nuclear Qualified Pressure Switch - Manual (Page 3)

Form 1472 (05.13) ©SOR Inc. 3/4
Increasing Set Points
If the normal operating pressure is below the
set point, then the pressure should be increased
from 0 PSI up to the increasing set point and
then back down to the reset point. Repeat this
cycle as necessary.
Decreasing Set Points
If the normal operating pressure is above
the set point, then the calibration should be
checked by first pressurizing to the normal
operating pressure, then reducing the pressure
to the decreasing set point, and then increasing
the pressure to the reset point. Repeat this cycle
as necessary.
To adjust pressure at which switch will operate, remove cover and tighten the hex head
adjusting nut with a 3/4” wrench to increase pressure; loosen to reduce pressure. Sighting
across the top of the 3/4-inch hex adjusting nut to the scale gives approximate set point
pressure.
After calibration is complete, reinstall the cover with new gaskets or o-rings as required by
the Maintenance instructions.
Switching Element
Calibration Scale
Adjusting Nut
Site Storage
Store switch in a dry area in the original shipping package. Shelf life is 10 years for a
maximum ambient temperature of 80°F, based on aging data in SOR Test Report 9058-102.
Calibration
The Switching element has been positioned with a dial indicator to a
tolerance of ±.002 inches. Do not move this switching element! Its position has
nothing to do with the set point adjustment. Any movement can either render
the switch inoperative or cause the switching element to be damaged with
overpressure.
To check the set point of a switch, monitor either the common (C) and normally open (NO)
or the common (C) and normally closed (NC) contacts for change of state. Connect the
process connection to a regulated hydraulic or pneumatic pressure source. Monitor with
an accurate pressure measuring standard. Slowly increase or decrease the pressure to
accurately capture the precise moment that the switch changes state. To assure the most
accurate and repeatable results, the switch must be tested in an identical manner each time
the calibration is checked.