SOR Mini-Hermet User Manual

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Form 168 (05.13) ©SOR Inc.

Calibration

Mini-Hermet 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 cover screw.

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 knurled weathertight cover screw.



Use 1/8 inch hex (Allen type) wrench to turn adjusting screw to achieve desired

set point. Turn adjusting screw clockwise (in) to increase set point; turn

adjusting screw counterclockwise (out) to decrease set point. Use an external

pressure measuring device to accurately calibrate set points.

Do not unthread the adjusting screw more than two threads below the fl ush
point of housing as calibration could be adversely affected.



After the set point has been calibrated, replace the cover screw 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 Inc. for inspection and necessary
repair work. Any field work should be performed by a qualified instrument technician
following formal SOR procedures.

NOTE: UL Listed models are suitable for handling petroleum-based, fl ammable and
combustible liquids and gases, air, oxygen and water at fl uid temperatures not exceeding
40°C and designed for ambient temperatures not exceeding 75°C.

Units in hazardous locations - Prior to removal from service, make sure that
the work area is declassifi ed. Failure to do so could result in severe personal
injury or substantial property damage.

Safety Integrity Level (SIL) Installation Requirements

The SOR pressure switches have been evaluated as Type-A safety related hardware.
To meet the necessary installation requirements for the SIL system, the following
information must be utilized:

Proof Test Interval shall be one year.
Units may only be installed for use in Low Demand Mode.
Products have a HFT (Hardware Fault Tolerance) of 0, and were evaluated in a

1oo1 (one out of one) configuration.