PRODUCT DATA
60-2186—2
S437A,B, S637A
Sail Switches
APPLICATION
The S437 and S637 Sail Switches respond to the air velocity
in heating or warm air ducts, such as used in farm crop dryers.
The switch completes a 24 V or line voltage burner control
circuit only when the blower or fan has produced a
predetermined air velocity.
FEATURES
• Micro Switch snap switch is operated by metal sail
inserted in an air stream. (S437 switch is spst, S637
switch is spdt.)
• S637 has a set of normally closed contacts which can
be used to energize a signal or warming circuit when
the velocity drops off.
• Sail can be trimmed to one-half the original size to
double the velocity required to close the snap switch
contacts.
• Switch differential can be manually adjusted by
turning a knurled knob on the snap switch.
• A conduit knockout is located on each end of the case
for wiring convenience.
SPECIFICATIONS
Mounting Position:
Velocity characteristics listed apply when
standard size sail is inserted in a horizontal air stream with
the sail pivot in a vertical position. Vertical mounting with air
movement upward is satisfactory; however, characteristics
will change. Device cannot be vertically mounted with
downward air movement.
Mounting Means:
Case screw-mounts to duct wall with sail
inserted through wall into air stream.
Mounting Dimensions:
Refer to Fig 1.
Sail Size:
Standard - 1 x 3 in. (25 x 76 mm).
Large - 1 1/2 x 4 in. (38 x 102 mm).
Contents
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring ...............................................................................
Checkout ..........................................................................