K-TEK, a leading manufacturer of state-of-the-art instrumentation for level, pressure, and temperature measurement, has announced the BETA Air Relay, a new, pilot-operated, snap action pneumatic switch from BETA N.V. The switch features a patented, snap-action mechanism that does away with problems associated with throttling bands. Unlike other pilot-operated vent valves, the Air Relay can
Designed for valve control, bleed-off shut-down, or alarm applications -- both offshore and on -- the BETA Air Relay can also be safely used in hazardous areas, including Zone 0 (no spark) applications. The switch is available in two configurations: TYPE SA for Normally Closed (N.C.) operation and TYPE SB for Normally Open (N.O.) operation.
Unique Switch Design
"A high quality, self-aligning diaphragm/piston sensor is at the heart of the BETA Air Relay switch," stated Winston Landymore, BETA Product Manager at K-TEK. "Limited piston travel translates pressure at the diaphragm directly to actuation of the microswitch. This means no intervening linkages or mechanisms, and full protection against high overrange pressures up to 400 bar."
The BETA Air Relay's piston sensor is isolated from the process fluid by a diaphragm and static O-ring seal, retained by a process connection port. These process wetted parts are available in a wide range of materials, eliminating the need for costly chemical seals. Process connections are available in 316 stainless steel, Monel, and aluminum. Diaphragm and O-ring material choices include Buna-N, EPR, Kalrez, neoprene, Teflon, 316 stainless steel, tantalum, Viton A, and Monel. A venting port avoids overpressure in the enclosure.
The BETA Air Relay has been certified by KEMA for use in potentially explosive atmospheres.
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