... , 08, 10,40) STQxx80 (xx=02, 04, 06, 08,40)Light axis pitch10mm, 20mm, 40mm, and 80mmProtection height Height=(xx-1 ... )×light axis pitch STQxx20 230,310,390,470.,1350mm STQxx30 140, ... ,a controller and two signal cables.The emitter launches light to mirror, through reflecting to receiver, forms two or three protection light curtains