Providing machine and automation design engineers with a reliable means of non-contact interruptive object sensing, OPTEK Technology has developed a low-profile slotted switch designed with a wide slot to accommodate myriad applications. Designated the OPB200, the optically triggered switch contains an 890 nm infrared LED and a phototransistor paired in an opaque plastic housing.
When no object is present in the slot, the output phototransistor conducts current to maintain the circuit. When an object enters the slot and blocks the beam of infrared light from the LED, the output switches to the OFF state to interrupt the circuit. The device housing is constructed of opaque injection-moulded plastic to minimise the sensitivity of the assembly’s optical components to ambient visible and near-infrared light.
The OPB200 exhibits a forward voltage of 1,7 V @ IF = 20 mA, with a reverse current of 100 μA @ VR = 2 V. Collector-emitter breakdown voltage is 30 V @ IC = 1 mA, with emitter-collector breakdown voltage of 5 V @ IE = 100 μA. Collector dark current is 100 nA; collector-emitter saturation voltage is 0,4 V; and the on-state collector current varies from 1 mA to 6 mA. Operating temperature range is from -40°C to +85°C. The slot measures 5,1 mm wide with a depth of 8,1 mm and the overall board-mounted profile of the device is 10,16 mm. Lead length is 10,8 mm with spacing of 10,16 mm.
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