K-TEK”s BETA Air Relay, a pilot-operated, snap-action pneumatic switch, features a patented, snap-action mechanism designed to address problems associated with throttling bands. Unlike other pilot-operated vent valves, the Air Relay can be fine-tuned for accurate increasing or decreasing action. The switch features a narrow deadband, as low as 10 mbar, and supports pilot supply and signal pressures up to 7.0 bar. Designed for valve control, bleed-off shut-down, or alarm applications, the BETA Air Relay can also be used in hazardous areas, including Zone 0 (no spark) applications. The switch is available in two configurations: TYPE SA for normally closed (NC) operation and TYPE SB for normally open (N.O.) operation.The BETA Air Relay has been certified by KEMA for use in potentially explosive atmospheres.
Courtesy of Malema
