Specialty ModelsAir Pressure Sensing SwitchesThe Model DFS-460 is a general purpose airflow proving switch designed to require manual operator reset following actuation. It can be used to sense positive, negative, or differential air pressure in any HVAC and Energy...
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.
FS SeriesAir Pressure Sensing Switches Nonadjustable set point for duct heater, oven, and similar HVAC or Energy Management applications SPDT snap switch operates on pressure rise of 0.05 ± 0.02" wc Senses positive, negative, or differential air pressure Conduit...
DFS SeriesAir Pressure Sensing Switches Open-mounted, nonadjustable switch for duct heater, oven, and other HVAC or Energy Management applications Surface-mounts in areas where internal access is limited The plated housing contains a diaphragm and a snap-acting SPDT...
DFS SeriesAir Pressure Sensing SwitchesNonadjustable switch for duct heater, oven, and other HVAC or Energy Management applications for areas where protective snap switch cover is required Surface-mounts via the 1" - 14 externally threaded connector with PAL nut SPDT...
DFS SeriesAir Pressure Sensing Switches Nonadjustable switch for duct heater, oven, and other HVAC or Energy Management applications for areas where protective snap switch cover is required Surface-mounts via the 1" - 14 externally threaded connector with PAL nut SPDT...
DFS/FS SeriesAir Pressure Sensing Switches Economical nonadjustable proving switch for duct heater, oven, and similar applications. Senses positive air pressure. Surface-mounts in areas where internal access is limited. Plated housing contains a diaphragm and a...
DFS SeriesAir Pressure Sensing Switches Open-mounted, nonadjustable switch for duct heater, oven, and other HVAC or Energy Management applications Surface-mounts in areas where internal access is limited The plated housing contains a diaphragm and a snap-acting SPDT...
FS SeriesAir Pressure Sensing SwitchesModel FS-751 Air Pressure Sensing Switch is an airflow proving switch designed for duct heater, oven, and other HVAC or Energy Management applications that require a nonadjustable switch with a conduit enclosure for protection...
DFS SeriesAir Pressure Sensing SwitchesModel DFS-448-112 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 needed. It is especially suitable...