Single thru-beam photoelectric sensors are a simple and cost-effective way of securing hazardous areas. Together with a safety control unit, secure single thru-beam photoelectric sensors create a photoelectric protective device, such as Type 2 or Type 4 in accordance with EN ISO IEC 61496. The SL and SLA series are available in different designs and sensing ranges.
Multi-ray photoelectric sensors define a protection field of a certain height and width. They are based on the principle of the thru-beam sensor. The protection field, which is created from red or infrared modulated light beams, is evaluated by a receiver unit or external control interface unit. These photoelectric safety sensors are often characterized by a high number of beams with a low beam gap, which can lie between 500 mm for dual-beam protection and 14 mm for finger protection.