SOR Weatherproof Low Range - Manual

Form 536 (08.13) ©SOR Inc. 1/8
Explosion Proof
Series 20
Differential Pressure Switches
General Instructions
Registered Quality System to ISO 9001
Design and
specifications are
subject to change
without notice.
For latest revision,
go to 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.
Table of Contents
Installation .......................................2
SIL Installation ..................................2
Electrical Connection ...........................3
Calibration .......................................4
Dimensions ................................... 5-8
Weatherproof
These instructions provide information for installation, electrical connection, process
connection and calibration of SOR
® Series 20 Differential Pressure Switches.
Series 20 Differential Principle Basic construction is a Static “O” Ring diaphragm and
piston pressure sensor. Process pressure acts on the diaphragm to produce force Fh
against the piston. Fh is counteracted by two forces: Fl, which comes from the Lo side
Pressure port through the electrical housing, and Fs which comes from the adjustable
range spring. Since the Lo side process media pressurizes the electrical housing, Lo side
process media is limited to clean, dry air or inert gas.