Install Instructions

MODEL - SMD
Models may be mounted in a horizontal or vertical
position. All switches are tested at the factory in a
vertical position. Locations of fittings and types of
fittings may vary from unit to unit.
Mounting diaphragm in vertical position is the
preferred method.
Mounting in horizontal position, micro switch must
be on the top. When mounted in this position,
the minimum sensitivity may be higher than that
specified.
Installation
Dimensions
All settings are made with the diaphragm in a
vertical position. The switch is shipped with the
adjustment at minimum .17” W.C.
To adjust, turn adjusting screw with screwdriver.
To increase pressure setting, turn adjustment
screw down in a clockwise direction. To decrease
pressure setting, turn adjusting screw up, in a
counterclockwise direction.
Range Adjustment
4 13/32”
3 19/32”
Mounting Slots
2 1/4”
3”
Notes
Standard mounting bracket is shown. For other mounting
arrangements, contact factory.
All Models
Optional Fittings
Max. Surge Pressure 20”
W.C.
1/4” Barb
Max. Ambient Temp. 170º F 1/4” Tube
Max. Ambient Temp. -40º F 1/2” Compression
1/8” NPT
Connection
without fitting
1/2” Conduit
Knockout
O .88
7/8”
4 29/32”
NC
NO
C
SMDI 1010802016 Rev. A 11/07