SMN Flow Switches for Liquids

The SMN series flow switches are used where extremely low flow switching points are required in conjunction with minimal pressure drop at high flow rates. Typical applications include: control of water in cooling circuits, high-pressure cleaning equipment, flow detection in heating systems and a wide variety of other flow control applications. The SMN, with all-metal wetted parts, works on the float principle, but does not use the standard conical metering tube or slotted measuring nozzle. The special construction of the SMN float and flow tube requires that only a very low flow is necessary to slightly 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 pressure loss. The float resets on a loss of flow with the help of an opposing permanent magnet allowing toe SMN to be installed in any orientation with no resetting springs to wear out.

Special Features:
Switching Range:
On: 0.4 – 13 GPM Water
Off: 0.25 – 1 GPM Water
Maximum Pressure: 3600 PSIG Brass, 5000 PSIG SS
Maximum Temperature: 250°F
Fittings: 1” FNPT
Reed Contact: N/O (std.) or SPDT (opt.)

Product Specifications:
Switching Range: On: 0.4 – 13 GPM Water
Off: 0.25 – 1 GPM Water
Wetted Materials: Brass or SS
Max. Pressure: 3600 PSIG Brass
5000 PSIG SS
Temperature: 250°F Max.
Fittings: 1” FNPT
Switch Type: N/O (std.) or SPDT (opt.) Reed Contact
Maximum Contact Ratings: N/O:
240 VAC,100 VA,1.5 A
SPDT:
240 VAC,60 VA,1.0 A
Protection: NEMA 4X/ IP 65

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