Process connection – SOR Explosion Proof Pressure Switch UL/CSA/ATEX User Manual

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Form 316 (01.13) ©SOR Inc.

Process Connection

Dimensions are for reference only.

Contact the factory

for certified drawings

for a particular model number.

Linear = mm/inches

Drawing 0091417

Securely connect the process line to the pressure connection using two wrenches; one to hold
the wrench flats on the pressure port, the other to tighten the process pipe or tube fitting.

Ensure that the process connection is tightened and positioned so
that bending and torsional forces imposed on the pressure switch are
minimal. Do not loosen the pressure port from the body or the body from
the housing, because leakage could result or the pressure switch could
be rendered inoperative.

One vent connection should be fi tted with a suitable breather to maintain
weathertight rating NEMA 4, 4X, IP65 or vented to a safe area. Piping
should be minimum 1/4” diameter and maximum 5 meters long (based
on process fl uid SG 1.0). The other vent connection may be plugged.

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.