Dwyer Instruments 1950-1-2F Pressure Switch

The Dwyer Instruments 1950-1-2F is a precision-engineered explosion-proof differential pressure switch specifically designed for monitoring air and non-combustible gases in hazardous environments. This UL and CSA listed unit operates within a setpoint range of 0.4 to 1.6 in w.c., featuring an approximate deadband of 0.15 to 0.20 inches, ensuring reliable switching without nuisance tripping. As an integral explosion-proof switch, it eliminates the need for bulky external housings, utilizing a compact cast aluminum enclosure that is significantly lighter than traditional NEMA 7 designs. The internal SPDT switch provides versatile wiring configurations for various HVAC automation and industrial process controls. Connection is handled via 1/8" female NPT process ports, and the weather-resistant O-ring seal makes it suitable for demanding field installations. This diaphragm-actuated model is essential for combustion air proving and filter monitoring where Class I, Groups C and D compliance is mandatory.

• Explosion-Proof Protection: Compact design rated for Class I, Div. 1, Groups C, D; Class II, Groups E, F, G; and Class III environments.
• Precise Setpoint Adjustment: External adjustment screw allows for field calibration without opening the housing, maintaining the explosion-proof seal.
• Industrial Durability: Cast aluminum housing provides superior protection against harsh environmental conditions and mechanical stress.
• Versatile Media Compatibility: Engineered for use with air and non-combustible gases, ideal for complex duct systems and burner management.

What is the maximum pressure rating for the Dwyer 1950-1-2F?
The unit is rated for a maximum pressure of 45 in w.c. (11.2 kPa) continuous, with a surge limit of up to 10 psi (68.9 kPa) for short durations.

Can this switch be used for liquid applications?
No, this series is strictly designed for air and compatible non-combustible gases. Using liquids will damage the diaphragm and void technical certifications.

How do I adjust the setpoint on this model?
The setpoint is adjusted via a screw located on the top of the housing. Turning the screw clockwise increases the setpoint, while counter-clockwise decreases it within the 0.4 to 1.6" w.c. range.

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.