SOR Omni Weatherproof Pressure Switch User Manual

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Form 463 (05.13) ©SOR Inc.

Installation

The pressure switch may be line mounted by either rigid process piping or the electrical
conduit. The body of the pressure switch should be clamped to a suitable support member
on applications where either rigid process piping or electrical conduit is not available.

When rigid process piping or rigid electrical conduit is used it is important
that no bending or torsional forces be imposed on the pressure switch.

Process Connection

Use two wrenches when connecting process pipe: a 1-1/8” open-end wrench to hold the
hex pressure port while connecting the process pipe, the other wrench to tighten the
process pipe or tube fitting.

Do not use a pipe wrench or strap wrench on the round body or square
switching assembly while tightening the process pipe or tube fi tting. Use
wrench fl ats on process port only!

Electrical Connection

Omni pressure switches have 18” potted free leads of 18 AWG stranded copper wire. They
are marked NC – Normally Closed; NO – Normally Open; and C – Common.

Electrical switching elements are snap action Single-
Pole, Double-Throw (SPDT). (Termination: 1/2NPT(M)
conduit connection with free leads)

Use a 1-1/4” open-end wrench to hold the square
portion near the electrical connection while conduit
fitting is being tightened. Connect free leads as desired.

Blue (C)

Red (NC)

Black (NO)

Pressure

Care must be taken to ensure clearance is provided to prevent sharp objects
from cutting or abrading wire insulation.

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.