Description:

Model AFS-A is a general purpose airflow proving switch typically applied to package burners, furnaces, and fuel-burning equipment. AFS-A accurately senses positive, negative, or differential air pressure.

Features:

Mounting Position: Mount with the diaphragm in any vertical plane.
Set Point Range: 0.05 ± 0.02" W.C. to 12.0" W.C. (1.27 mm W.C. to 304.8 mm W.C.) (0 to 0.43 PSI).
Field Adjustable “Operate Range”: 0.07" W.C. to 12.0" W.C.
Field Adjustable “Release Range”: 0.04" W.C. to 11.2" W.C.
Approximate Switching Differential: Progressive, increasing from 0.02 ± 0.01"w.c. at minimum set point to approximately 0.8" W.C. at maximum set point.
Measured Media: Air, or combustion by-products that will not degrade silicone.
Maximum Pressure: ½ PSI (0.03 bar).
Operating Temperature Range: -40F to 180F (-40 to 82C).
Life: 100,000 cycles minimum at ½ psi maximum pressure each cycle and at maximum rated electrical load.
Electrical Rating: 300 VA pilot duty at 115 to 277 VAC,15 amps noninductive to 277 VAC, 60 Hz.
Contact Arrangement: SPDT.
Electrical Connections: Screw-type terminals with cup washers.
Conduit Opening: ⅞" diameter opening accepts ½" conduit.
Sample Line Connectors:¼" - 18 NPT female (high pressure inlet) ⅛" - 27 NPT female (low pressure inlet).
Sample Line Connections: Connectors will accept ¼" OD rigid or semi-rigid tubing.
Approvals: UL, FM, CSA.

Technical Literature for the AFS-A Air Proving Switch Here.

Technical Bulletin for the AFS-A Air Proving Switch Here.

Air Switch Glossary Here.