The CCW (Counter-Clockwise) rotation is critical for proper air displacement in specific ICP

Engineered for high-demand contractor applications

The large diaphragm-to-seat ratio allows for exceptional sensitivity

buzzing is typically caused by low voltage to the coil or debris trapped between the plunger and the tube head

Dwyer Instruments 1638-0 Pressure Switch R-22 The CCW (Counter-Clockwise) rotation isThe Dwyer Instruments 1638 0 Pressure Switch is a high precision, large diaphragm differential pressure switch engineered for critical HVAC and industrial process monitoring. Designed for use with air and non combustible gases, this low pressure switch features an adjustable range of 0. 05" w. c. to 0. 25" w. c., making it ideal for duct air control and sensitive differential pressure sensing. The unit utilizes a single pole double throw (SPDT)