Differential Pressure Switch

 

Differential Pressure SwitchThe Differential Pressure Switch model AFS-22 is a general purpose proving switch designed for HVAC and energy management applications. It may be used to sense positive, negative or differential air pressure.

The plated housing on the differential pressure switch contains a diaphragm, a calibration spring and a snap acting switch. The sample connections on each side of the diaphragm accept 0.25" O.D. metallic tubing via the integral compression ferrule and nut.

An enclosure on the differential pressure switch cover guards against accidental contact with the live switch terminal screws and the set point adjusting screw. The enclosure cover will accept a 0.5" conduit connection.

APPLICATION
The model AFS-22 is a general purpose proving switch designed for HVAC and energy management applications. It may be used to sense positive, negative or differential air pressure.

DESCRIPTION
The plated housing contains a diaphragm, a calibration spring and a snap acting switch. The sample connections on each side of the diaphragm accept 0.25" O.D. metallic tubing via the integral compression ferrule and nut. An enclosure cover guards against accidental contact with the live switch terminal screws and the set point adjusting screw. The enclosure cover will accept a 0.5" conduit connection.

MOUNTING
Select a mounting location which is free from vibration. The AFS-222 must be mounted with the diaphragm in any vertical plane in order to obtain the lowest specified operating set point. Avoid mounting with the sample line connections in the UP position. Surface mount via the two 3/16" diameter holes in the integral mounting bracket. The mounting holes are 3-7/8" apart.

AIR CONNECTION
The AFS-222 is designed to accept firm wall sample lines of 1/4" O.D. tubing by means of ferrule and nut compression connections. An optional adaptor suitable for slip on flexible tubing is available. For sample lines up to 10 feet, 1/4" O.D. tubing is acceptable. For lines up to 20 feet use 1/4" I.D. tubing. For lines up to 60 feet use 1/2" I.D. tubing. Locate the sample probe a minimum of 1.5 duct diameters downstream from the air source. Install the sampling probe as close to the centre of the air stream as possible.


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Differential Pressure Switch
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