PRODUCT DATA
68-0286
C437D,E Gas Pressure Switches
APPLICATION
The C437D,E Gas Pressure Switches are pressure-actuated
switching devices used in industrial gas system applications
for safety shutoff, pressure control, and differential-pressure
control.
All Series 4 models have MicroSwitch™ snap switches to
open or close a circuit on pressure rise or drop.
NOTE: Series numbers immediately follow OS numbers, i.e.,
C437D2003(4).
FEATURES
• C437 models have direct- and reverse-acting (spst)
switching.
• Pressure ranges: 1/2 to 5-1/2 in. of water (0.1 to 1.4
kPa); 1 to 26 in. of water (0.5 to 7 kPa); 1/2 to 5 psi (3 to
35 kPa); 1 to 10 psi (5 to 70 kPa).
• Models intended for lockout applications must be
manually reset before resuming operation.
• Trip-free mechanism on manual reset models ensures
that the limit function of the switch cannot be defeated
by jamming the reset lever.
• External manual reset button on side of lockout
models.
• Enclosed setting impedes tampering and provides
dust-resistant operation.
• Buna-N fiber-reinforced material for increased
strength of control diaphragm.
• Two Buna-N fiber-reinforced seal-off diaphragms for
added reliability.
• Clear glass cover allows observation of interior
mechanism to aid setting and checkout.
• Heavy die-cast case increases durability and
resistance to corrosion.
• Main control diaphragm completely enclosed a leak-
proof chamber can be vented to a safe area.
• Models with a pressure range of 1 to 26 in. of water (0.5
to 7 kPa) have a restrictive orifice in the inlet pressure
channel to compensate for momentary surges in gas
pressure.
• Field-addable orifices of various sizes are available.
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 4
Wiring ............................................................................... 5
Setting and Checkout ....................................................... 5
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