SOR Single Diaphragm Weatherproof Differential Pressure Switch with Terminal Block Connections - Manual (Page 2)

2/12 Form 506 (01.13) ©SOR Inc.
Installation
This product should only be installed by trained and competent personnel.

Secure the housing to a bulkhead, panel rack or pipe stanchion with suitable bolts.
For B-Series Housings: One vent hole should be fi tted with a suitable
breather to maintain weathertight rating NEMA4, 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 hole may be plugged.
Failure to mount the housing on a fl at mounting surface may result in
torsional forces on the housing that could cause false trips or render the
pressure switch inoperative.

Line mounting by either process connection or electrical conduit connection is not
recommended for housings with integral mounting pads.

Suggested mounting orientation is high side process pressure port at 6 o’clock.
However, the device can be mounted in any position. Optional breather drains should be
positioned to allow moisture to escape from the housing interior. Breather drains must
be kept clear of paint and foreign matter.
When bolting housings with integral mounting pads to irregular or uneven
surfaces, install rubber washers between the housing and the mounting
surface to prevent deformation of the housing.
Connect the process lines to the pressure ports using two wrenches: one to hold the hex
flats on the pressure port, the other to tighten the process pipe or tube fitting. The high
pressure side (stamped HI) and the low pressure side (stamped LO) have 1/4” NPT(F) or
1/4” BSP(F) process connections as standard.
Process Connection
Rigid process piping must be arranged to minimize bending or twisting
forces which could disturb the positioning of internal parts and change
calibration or render the device inoperative after installation. Use care
to avoid loosening the pressure port from the body or the body from the
electrical housing.
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. Form 1538 (03.12) ©2012 SOR Inc.