Sensors & Transducers


Proximity sensors with extended sensing range

August 2001 Sensors & Transducers

Turck has announced an extended range of proximity sensors with up to twice the sensing range of standard barrel sensors. The extended range allows these devices to be mounted farther from the sensing target, preventing sensor target contact to greatly reduce the likelihood of impact damage. The increased sensitivity also improves sensing reliability.

Preventing sensor impact provides more effective damage control than trying to cushion it with spring-loaded brackets or withstand the impact with reinforced metal-face sensors. Impact prevention results in decreased maintenance expenses and downtime.

Extended range sensors, available in barrel diameters of 12, 18 and 30 mm, can be used as direct replacements for other Turck sensors as well as competitive sensors. These devices are available in 'B' models, which can be fully embedded in steel without false triggering or losing range, as well as nonembeddable 'N' models.

Users can choose from two-wire DC, three-wire DC or four-wire DC models with either NPN (sinking) or PNP (sourcing) outputs and universal two-wire AC models. Integral circuitry protects the devices against short circuits and overloads.

Extended range sensors are available either prewired or with a quick disconnect. Quick disconnect models feature a one-piece barrel with four built-in LEDs, visible from all directions to indicate 'output is energised' and a keyed mechanical connection that simplifies wiring.

These robust devices feature epoxy-encapsulated circuitry and are sealed against cutting fluids, other harsh liquids and washdown. The sensors withstand shock to 30 g, 11 ms and vibration to 55 Hz, 1 mm amplitude in all three phases. Extended range sensors are rated NEMA 1, 3, 4, 6, 13 and IEC IP67.



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