DFS-221-112 Switch has barbed sample line connectors on each side of the diaphragm.

FS-751-185 Switch is equipped with integral recycling delay timer.

• DFS & FS Switches are simple, economical and reliable sensing switches with fixed set points. DFS models have high and low pressure connections. FS models have a high pressure connection.

• DFS & FS Switches actuate on pressure rise at 0.03"w.c., .05"w.c., 0.2"w.c., or 0.4"w.c.

• DFS & FS Switches are ideal for duct heater, oven, or other HVAC and Energy Management applications where a non-adjustable (tamper-proof) set point is desirable.

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• DFS-221
• DFS-221-112
• DFS-301-112
• FS-751
• FS-751-112
• FS-751-189

• DFS & FS Switches are available with either an enclosed snap switch or an "open-mounted" snap-switch for use in areas where internal access is limited.