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K-Tek has announced the availability of the Air Relay, a pilot-operated pneumatic switch from Beta.

The switch features a snap-action mechanism that eliminates problems associated with throttling bands.

The Air Relay can be fine tuned for accurate increasing or decreasing action.

The switch features a narrow deadband, as low as 10mbar, and supports pilot supply and signal pressures up to seven bar.

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 (NC) operation and Type SB for normally open (NO) operation.

‘A self-aligning diaphragm/piston sensor is at the heart of the Beta Air Relay switch,’ said 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 over-range pressures up to 400 bar,’ he added.

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 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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