Dwyer Instruments ADPS-03-1-N Pressure Switch

The Dwyer Instruments ADPS-03-1-N is a field-adjustable differential pressure switch designed for monitoring overpressure, vacuum, and differential pressure in HVAC and building automation systems. Operating within a range of 0.08 to 1.20 in w.c. (20 to 300 Pa), this unit provides precise control for filter monitoring, fan status indication, and frost protection on heat exchangers. The switch features a dual-scaled adjustment knob in both inches water column and pascals, allowing technicians to calibrate setpoints without a pressure gauge. Built with a glass-filled polycarbonate housing and a silicone diaphragm, the ADPS-03-1-N ensures long-term reliability in non-combustible gas applications. The SPDT contact configuration facilitates easy integration into control loops, while the 1/2 inch NPT connection and multi-directional mounting options streamline installation in tight mechanical plenums and air handling units.

Key Benefits

• Simplified Calibration: The integrated setpoint adjustment knob eliminates the need for external manometers during field setup.
• Versatile Integration: Features SPDT electrical contacts for flexible wiring in normally open or normally closed configurations.
• Robust Construction: Engineered with a UL 94 V-0 flame-rated housing suitable for demanding commercial environments.
• Mechanical Precision: Utilizes a high-sensitivity silicone diaphragm for accurate switching even at low differential pressures.

Common Questions

Can the ADPS-03-1-N be used in vertical or horizontal orientations?
Yes, though the factory calibration is performed with the diaphragm in a vertical position. If mounted horizontally, the setpoint may shift by approximately 0.08 in w.c., requiring manual recalibration.

What is the maximum pressure rating for this switch?
The ADPS series is rated for a maximum pressure of 40 in w.c. (10 kPa). Exceeding this limit can damage the diaphragm and compromise switching accuracy.

Is this pressure switch suitable for outdoor installations?
The unit is NEMA 13 and IP54 rated, meaning it provides protection against dust and splashing water, but it should be shielded from direct elements or installed within a secondary enclosure for extreme outdoor conditions.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.