Description
The Dwyer Instruments 1900-20MR Low Differential Pressure Switch is a small switch used to measure low differential pressures in HVAC systems and other systems that deal with air or non-combustible gases. This switch has a pressure range of 4”-20” WC and useds a manual reset that prevents the switch from resetting automatically after an alarm condition. It uses a single SPDT output for switching and is ideal for use in filter monitoring, air volume regulation in ovens and dryers, and refrigeration coils. The advantages include high repeatability, heavy duty for use in harsh conditions, and ease of setpoint control through a screw that is behind the housing to discourage adjustment.
