SOR 141 User Manual

131/141 Nuclear-Qualified

Differential Pressure Switches

General Instructions

131

1/8” NPT(F) Vent Connection

High Side Process Connection

141

1/8” NPT(F) Vent Connection

Cover Screws

Cover Screws

Body

Housing

3/4” NPT(F) Conduit Connection

Sensor

Mounting Holes

Low Side Process Connection

3/4” NPT(F) Conduit Connection

Wire Leads

Wire LeadsHousing

Body

Low Side Process Connection

High Side Process Connection

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.

Sensor

Mounting Holes

Low Side Process Connection

Installation

Mount pressure switch to rigid vertical mounting surface with four 1/4-20 Grade 5 screws
(not supplied). Torque screws to 70 - 85 in/lbs. The 141 must be oriented with the sensor
down (housing up).

Design and specifications are subject to change without notice.

For latest revision, go to www.sorinc.com

Form 1307 (04.13) ©SOR Inc.

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Process Connection

Be certain the process connection is tightened and positioned so bending and torsional
forces imposed on pressure switch are minimal. Use care not to loosen sensor assembly
from housing.

131 - One process connection is provided for the high-pressure side of the device and one
for the low-pressure side.

141 - Two process connections are provided for the high-pressure side of the device and
two for the low-pressure side. On liquid service, the extra process connections should be
used to assist in bleeding the air out of the sensor. On gas service, they may be used to
drain condensate or accumulated liquid.

When the process could be considered dirty in terms of suspended particles,
it is recommended that 20-micron in-line  lters be installed on the Hi and Lo
pressure ports.

Electrical Connection

Electrical connections are
marked on the insulation
of the wire leads. Conduit
should be installed without
applying strain to the
housing.

Differential

Pressure

Differential

Pressure

Minimum Bend Radius for Wire

Permanent Training 1/2”R

Pulling Tension 1”R

Terminating Junction 1/4”R

Site Storage

Store switch in a dry area in the original shipping package. Shelf life is 10 years for a
maximum ambient temperature of 80°F, based on aging data in SOR Test Report 9058-102.

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Form 1307 (04.13) ©SOR Inc.