SOR Weatherproof Low Range - Manual (Page 4)

4/8 Form 536 (08.13) ©SOR Inc.
If no set point was specified for factory calibration, or if the set point specification has
changed:

Remove housing cover. Calibrate the device as a gauge pressure switch. Turn the set
point adjusting nut clockwise to increase the set point, or counterclockwise to decrease
the set point.

To verify Series 20 operation under system operating conditions, install the cover and
tighten it securely. Connect the HI and LO sides to suitable pressure sources and raise
the pressures simultaneously to the expected system operating pressure. Apply a
liquid leak test solution around the cover seal to make sure that Lo side pressure is not
leaking. Vary Lo side pressure to verify actuation (deactuation) of the electrical
switching element at the desired Differential Pressure Set Point.
Calibration
If a set point was specified for factory calibration, there may be no need to remove the
pressurized electrical housing cover. Factory calibration can be verified on a test bench by
connecting a continuity tester across the common (C) and normally open (NO) wire leads.
Pressurize the Hi side pressure port and check actuation (deactuation) points on a
calibrated reference gauge.
Before removing the cover during test or while the unit is in service,
relieve pressure inside the housing by venting Lo side pressure to
atmosphere. When replacing the cover, tighten it securely. Pressurize
the Lo side and apply a liquid leak test solution around the cover seal to
make sure that pressure is not leaking
Units in Hazardous Locations: Prior to calibration, make sure that the work
area is declassifi ed before removing the explosion proof cover to calibrate
the unit. Failure to do so could result in severe personal injury or substan-
tial property damage.
Disconnect electrical power before removing cover in hazardous area!
Avoid movement of the electrical switching element or its bracket. It has
been precisely positioned for optimum performance at the factory. Even
slight movement will affect performance; excessive movement can render
device inoperative.