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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