DFS Series
Fixed Set Point Air Pressure Sensing Switches

Series DFS / FS

Series DFS and Series FS are simple,
reliable general purpose sensing switches with non-adjustable fixed set points suitable for
duct heater, oven, energy management,
and similar applications. They can be configured to sense positive, negative, or differential
air pressure. The  standard, factory-
fixed set point is between 0.03″ wc
and 0.40″ wc. The wide range
of standard features includes:
• Mounting brackets
• Sample line connector styles
• Terminal styles
• Open or enclosed switch terminals

Many standard and custom options are available.

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Series-DFS-FS

 

 

Additional DFS Series Products

DFS-448-112

DFS-448-112

DFS SeriesAir Pressure Sensing SwitchesModel DFS-448-112 Air Pressure Sensing Switch is a proving switch designed for...

DFS-301

DFS-301

DFS SeriesAir Pressure Sensing SwitchesModel DFS–301 is an airflow proving switch designed for duct heater, oven, and...

DFS-221-112

DFS-221-112

Model DFS-221-112 Air Pressure Sensing Switch is a proving switch designed for duct heater, oven, and other HVAC or Energy Management applications where an open-mounted, nonadjustable switch is desirable. It is especially suitable for surface-mounting in areas where internal access is limited. Model DFS-221-112 can be used to sense positive, negative, or differential air pressure. The plated housing contains a diaphragm and a snap-acting SPDT switch. The DFS- 221-112 is equipped with convenient dual- barbed sample line connectors located on each side of the diaphragm. The dual-barbed connectors accept 3⁄16″ or 1⁄4″ ID flexible tubing. The electrical connection consists of 1⁄4″ 90o quick connect spade terminals. The SPDT snap action switch operates on pressure rise of 0.05 ± 0.02″ w.c. For additional application and technical information, please contact the sales office.

DFS-221

DFS-221

DFS / FS  SeriesAir Pressure Sensing SwitchesModel DFS–221 is an airflow proving switch designed for duct heater,...

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