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Form 281 (05.18) ©SOR Inc.
The SOR Adjustable Dead Band pressure switch incorporates two industry proven Static “O” Ring pressure sensing
elements. Media pressure on the areas of the pistons counteracts the forces of the range springs — each
adjustable by a separate adjusting nut — and moves the piston shafts to operate the lever assembly which, in
turn, actuates and deactuates the electrical switching element. Each pressure sensing element of the Adjustable
Dead Band pressure switch is a force balance piston-actuated assembly sealed by a flexible diaphragm and
an o-ring that is static. The only wetted parts are the single pressure port, two diaphragms, and two o-rings all
indicated with asterisks (*) in this illustration.
Principle
Adjustable Dead Band
Pressure Switches
No Pressure: Electrical switching element is
deactuated.
Pressure greater than decreasing Set Point but
less than increasing Set Point. Electrical switching
element remains deactuacted.
Pressure equal to or greater than
increasing Set Point: Electrical
switching element is actuated.
Pressure less than increasing Set
Point but greater than decreasing
Set Point: Electrical switching
element remains actuated.
Pressure equal to or less than
decreasing Set Point: Electrical
switching element is deactuated.
*Pressure Port
Principle Schematic
The lever assembly travel illustrated here has been exaggerated for clarity.
Screw Terminal Block
(Weathertight Model Only)
Lever Assembly
Calibration Scale
Decreasing Set Point
Adjusting Nut
Piston Assembly
Pressure Range Spring
*Diaphragm
*O-Ring
*O-Ring
*Diaphragm
Pressure Range Spring
Piston Assembly
Housing
Increasing Set Point
Adjusting Nut
Calibration Scale
Electrical Switching
Element (Explosion Proof
Model has Hermetically
Sealed Switching Element
Capsule)
Actuation Deactuation
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