SOR Big Hermet Explosion Proof, Hermetically Sealed, Pressure Switch - Manual (Page 3)

Form 280 (04.13) ©SOR Inc. 3/8
Electrical Connection

Set Point adjustment; 3/4” hex nut

Overtravel adjustment; hex screw
(factory preset) See caution note above

Calibration scale

Housing mounting pad

UL Listed, CSA Certified and SAA
Approved hermetically sealed explosion
proof switching element capsule

3/4” NPT(F) conduit connection, factory
sealed 18” 18 gauge wire leads (glass
seal not shown)

Breather vent; sintered 316ss
(only shown)

Body

Pressure port

Housing
Switch shown with
overtravel adjustment
guard removed.










Electrical connections are free leads; 18 gauge, 18” with ground wire and 3/4 NPT(F)
conduit connection. Use two wrenches: one to hold hex conduit connection, the other to
tighten conduit fitting. The hermetically sealed, explosion proof switching element capsule
has UL Listed/CSA Certified factory-sealed leads. Consequently, an external seal fitting is
not required between the pressure switch and junction box of the external electrical circuit.
Blue (C)
Black (NO)
Red (NC)
Green (GND)
Green (GND)
Blue (C)
Black (NO)
Red (NC)
Brown (NO2)
Orange (NC2)
Yellow (C2)
VACUUM SWITCH
Wiring Schematics for SPDT Switching Element in Compound Vacuum-Pressure Switches
When operating in vacuum range, i.e. when set point is
calibrated to vacuum, use wiring schematic below.
Pressure
When operating in positive pressure range, i.e.
when set point is calibrated to positive gauge
pressure, use wiring schematic below.
Vacuum
DPDT (2-SPDT)
SPDT