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Optek Technology has announced that the OPB732 series long-distance infrared reflective switch has been employed in a 6kW wind turbine for rev/min sensing.

Placed at the turbine rotor, the switch is used internally to sense rev/min, and that data is then transmitted to a customer-accessible website via GPRS.

The OPB732 has a non-contact design, which features an emitter and sensor protected from contaminants by a clear window.

In addition to wind turbines, the OPB732 reflective switch is said to be ideal for use in assembly line and machine automation, equipment security, door sensor, machine safety, end-of-travel sensor, and non-contact reflective object sensor applications.

The OPB732 series switch has a reflective distance of more than 1in, depending on circuitry.

The reflective switch configuration includes an infrared LED and phototransistor, and uses an opaque housing to reduce the sensor’s ambient light sensitivity.

When infrared light strikes the phototransistor, it becomes forward biased and is considered to be in the ‘on’ state, proving an IC(On) current proportional to the light striking the phototransistor.

When the infrared light from the LED is not reflected to the phototransistor, the device turns ‘off’, minimising the IC(On) current The OPB732 series infrared LED features an 850nm wavelength and a power dissipation of 100mW.

Maximum forward current is 50mA and maximum forward voltage is 1.8V (If=20mA).

Reverse DC voltage is 3V, with reverse current of 100mA (Vr=2.0V).

The output phototransistor features collector-emitter voltage of 30V, collector DC current of 50mA, and power dissipation of 100mW.

Operating temperature range for the long-distance reflective switch is -40C to +85C.

The OPB732 series assembly is offered with PC board through-hole pins or 24in, 26 AWG wires.

The phototransistor can be configured as a common collector or common emitter device.

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