Dwyer 1900 Low Differential Pressure Switches for OEM Applications

• Typical applications include air conditioning refrigeration coil icing detection, defrost cycle initiation, clogged filter detection, and variable air volume controllers.
• For use with air and non-combustible gases
• Compact size and repeatability ±3% for industrial and OEM applications
• Range screw protected inside enclosure makes adjustments easy while preventing tampering
• 1/8" NPTF process connection
• Three screw-type electrical connections: Common, normally open, and normally closed
• Pressure limits to 45" WC continuous, 10 PSIG surge
• Temperature limits -30° to 180° F
• Snap switch manual reset optional: Latches on pressure increase above setpoint, must be manually reset after pressure drops below setpoint. Manual reset version not UL, CSA, or FM listed
• Also available with NEMA 4/IP66 weatherproof steel gasketed enclosure (-WP) or cast iron/brass explosion-proof housing (-EXPL). Call for pricing and availability.

Model Selection Guide

Use this table to find the right model for your application.  Don't see the size, range, or mounting style you need? Call a Lesman sales specialist at 800-953-7626. Models also available with weatherproof or explosion-proof enclosures. Call for current pricing and delivery.

Orders placed before 3PM central time for in stock models ship the same day.