Barksdale CD2H-A3SS Diaphragm Pressure Switch

The Barksdale CD2H-A3SS Diaphragm Pressure Switch is a dual-setpoint, housed diaphragm switch designed for precise low-pressure monitoring (0.03 to 3 psi) in positive-pressure or vacuum applications. Encased in a NEMA 4 enclosure with tamper-proof external adjustment dials and self-locking set screws, it provides rugged protection in demanding environments. The unit features a 1/4" NPT pressure connection and a 3/4" NPT conduit connection with approximately 18 inches of six-wire leads for installation flexibility. It offers two SPDT outputs for independent control of two circuits, with wiring options that accommodate normally open or normally closed configurations. The diaphragm sensing element is constructed from stainless steel (commonly 304 SS) to enhance durability and stability, and the model is part of Barksdale’s CD1H/CD2H family of diaphragm switches, designed for both positive pressure and vacuum service up to 150 psi in the broader line. This combination makes the CD2H-A3SS well suited for precise pneumatic or process-control duties in compact, rugged packages where external adjustability is essential.