Owner manual

2/4
Form 1296 (05.13) ©SOR Inc.
Do not use a pipe wrench or strap wrench on the round body nor an open-end
wrench on the hex pressure port while tightening the conduit connection,
because the hermetically sealed switching element capsule has been precisely
positioned and locked during manufacture. Excessive force could overcome the
lock and cause movement which will adversely affect operation or render the
pressure switch inoperative. Should movement occur, factory calibration must
be performed in order to restore normal operation.
Electrical leads are in duplicate for wiring supervision and are marked NC (Normally Closed),
NO (Normally Open) and C (Common).
Calibration
The Pressure Switches are field adjustable across the entire cataloged range for a particular
piston/spring combination. Field adjustable models have a set point adjustment under the
removable weathertight cap.
It is not necessary to disconnect the electrical power, since the electrical switching element is
inside the hermetically sealed, explosion-proof capsule, thereby maintaining explosion-proof
integrity.
 Remove the knurled weathertight cap.
 Use an 1/8 inch hex (Allen type) wrench to turn the adjusting screw to achieve the
desired set point. Turn the adjusting screw clockwise (in) to increase set point; turn the
adjusting screw counterclockwise (out) to decrease set point. Use an external pressure
measuring device to accurately calibrate set points.
 After the set point has been calibrated, replace the weathertight sealing cap tightly to
ensure the weathertight integrity of the device.
SOR discourages field modifications, change-out of wetted parts or repair. It is recommended
that products be returned to SOR for inspection and necessary repair work. Any field work
should be performed by a qualified instrument technician with formal SOR procedures.
Electrical Connection
Ensure that wiring conforms to all applicable
local and national electrical codes and install
unit(s) according to relevant national and local
safety codes.
Use an 1-1/8 inch open-end wrench to hold
the hex on the electrical connection while
conduit or conduit fitting is being tightened.