... pitch SQLxx40 440,520,600,680......1560mmSQLxx80 400,560,720,880......1520mmSQLxx320 320,640,960 ... mm3.Working principleThe protector consists of light curtain,signal cables,controller and control ... the transmissive direction of the beams,forming 2 or 3 sides protected zone.(2)Light curtain form: ... Identifies the parameters for the selected ( High-end products)safety light curtain SQL1880