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LS10 Light Screen Systems consist of two self-contained units: an emitter and a receiver. Multiple infrared LEDs in the emitter are aligned in a row and strobed (turned ON one at a time) in a specific sequence and at a high frequency. Receivers contain a matching array of phototransistors. The length (height) of the array is 90 mm (3.5"), and produces a curtain of light as wide as the distance between the emitter and receiver. The receiver may be placed 4" to 48" opposed from the emitter (LS10E/LS10R) or 4" to 8" away (LS10ESR/LS10RSR). The LS10E/LS10R system can detect objects as small as 7.6 mm (0.30") in diameter; minimum detectable object profile for the LS10ESR/LS10RSR system is 5.6 mm (0.22").