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General Description
SMN flow switches are used when
extremely low flow switching points are
required in combination with minimum
pressure loss at high flow rates. Typical
applications include the control of water and
cooling circuits, high pressure cleaning
devices, control of contaminated media in
effluent and heating systems and a wide
variety of other flow control systems.
The SMN, with all-metal wetted
parts, works on the float principle. However,
it does not use the standard conical metering
tube or slotted measuring nozzle. Instead, a
float with an integral magnet is suspended
within a cylindrical measuring tube. The float
is moved by the flow stream against the
magnetic field of an opposing magnet
mounted in the top of the instrument. The
magnetic field produced by the float
activates a reed contact at the switch point.
The reed contact is mounted on the outside
of the SMN body.
The special construction of the SMN float
and flow tube means that only a low flow is
required to raise the float and thus close the
contact. When the float reaches the top of
its travel, an additional flow path opens,
allowing high flow rates without a significant increase in pressure loss. When the flow is
interrupted, the float is moved back down
the flow tube by the opposing magnetic field
and the contact opens.
Specification
Switching Range:on: 0.4-13 GPM H2O
off: 0.25-1 GPM H2O
Housing Material: Brass or SS
Max. Temperature: 250°F
Maximum Pressure: Brass: 3600 PSIG
SS: 5000 PSIG
Fittings: 1" NPT
Contact: N/O or SPDT
Maximum Contact Ratings:
N/O: 240 VAC, 100 VA, 1.5 A /
SPDT: 240 VAC, 60 VA, 1 A
Protection: NEMA 4
Approvals: UL, CSA
Dimensions
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