ABB 3HAC6157-1 Floppy sign cable

LS4EL/RL Light Screen Systems offer a simple, economical, but highly reliable means of sensing objects moving at high speed through an area (or window.) Each system consists of two self-contained units: an emitter and a receiver. Emitters contain four infrared light sources aligned in a raw 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 height of the array is 90 mm (3.5 in). 

The LS4RL receiver may be placed 45.7 cm to 228.6 cm (18 in to 90 in) opposed from the LS4EL emitter. This produces a curtain of light 127 mm to 152 mm (5 in to 6 in) high and as wide as the separation distance between the emitter and receiver. The smallest object that can be detected depends upon the location of the object within the curtain. Midway between emitter and receiver an object 25 mm (1 in) or larger in a cross section can be detected anywhere within a 125 mm (5 in) high window. 

Near the emitter or receiver

an object of 38 mm (1.5 in) or larger in cross section can be detected anywhere within a 152 mm (6 in) high window. The light from the emitter is modulated to minimize sensitivity of the system to ambient light. An indicator LED on the emitter lights whenever power is applied. The receiver has an alignment LED which lights whenever the beam is broken. Models are available with either attached cable or integral quick disconnect fitting. The receiver output interfaces directly with dc loads or circuits up to 30 V dc, and offers both NPN and PNP output transistors. Outputs are energized continuously while the beam is broken. A 5 millisecond pulse stretcher (OFF delay) is included to improve interfacing reliability.

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