... , 06, 08......20)Light axis pitch 20mm, 40mm, 80mmProtection height=(xx-1)×light axis pitchSTQxx20 140,220,300,380......1420mmSTQxx40 ... 120,200,280,360......2840mmSTQxx80 80,240,400,560......1520mm3.Working principleThe protector consists of light ... 5)Controller:W type, outside installation,control 1 set light curtain,the power source is AC220V/110V(switch conversion ...