Optek OPB732: Long-distance reflective switch aims at wind turbines for rpm sensing

The long-distance OPB732 infrared reflective-switch series targets 6-kW wind turbine for rpm sensing. The switches work internally at the turbine rotor to sense rotations per minute, transmitting data to a customer-accessible Web site over a GPRS. The reflective device also suits use in assembly-line and machine-automation, equipment-security, door-sensor, machine-safety, end-of-travel-sensor, and noncontact-reflective-object-sensor applications. The switches have a reflective distance of more than 1-in., depending on circuitry. The configuration includes an infrared LED and a phototransistor and uses an opaque housing, reducing the sensor’s ambient-light sensitivity. Features include an 850-nm wavelength and a 100-mW power dissipation, a 50-mA maximum forward current, and a 1.8V maximum-forward voltage at a 20-mA forward voltage. The device also provides a 3V reverse-dc voltage with a 100-mA reverse current with a 2V reverse voltage. Devices in the OPB732 series cost $2.85 (1000) each.

Optek, www.optekinc.com