SOR Dual Hi-Lo Weatherproof Pressure Switch - Manual

Form 248 (04.13) ©SOR Inc. 1/4
The pressure sensing elements are a pair of force-balanced,
piston-actuated assemblies sealed by flexible diaphragms and o-rings
that are static. The only wetted parts in this arrangement are the single
pressure port, two sensing assembly diaphragms and o-rings.
Media pressure on the area of the pistons counteracts the force of
the range spring (adjustable by the adjusting nuts),
which moves the piston shafts only a few
thousandths of an inch to directly actuate
the electrical snap-action switching elements.
Dual Hi-Lo
Pressure Switches
General Instructions
Registered Quality System to ISO 9001
Design and specifications are subject to change without notice.
For latest revision, go to www.sorinc.com
NOTE: If you suspect that a product is defective,
contact the factory or the SOR
® Representative in
your area for a return authorization number (RMA).
This product should only be installed by trained
and competent personnel.
Installation
Dual Hi-Lo Pressure Switches may be secured to bulkheads, panels or pipe stanchions with
suitable bolts. When mounting the pressure switch to an irregular or uneven flat surface,
install rubber washers on the mounting bolts between the housing and the mounting surface.
Failure to place washers between the housing and the mounting surface may
result in torsional forces on the housing that could cause false trips or render
the pressure switch inoperative.
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.
ral Instructions
V2 Weathertight
Explosion Proof
Hermetically
Sealed
V1 Weathertight
Housing
Line mounting by either the process connection or the electrical conduit connection is not
recommended.
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.