ALS series flameproof valve monitor (limit switch box) including ALS200, ALS300, ALS400, ALS500 and ALS600 series were designed and manufactured by AFL Group through advance state-of-the-art engineering technology and its special patent technology which have the flameproof valve monitor to be solid, beautiful and with high-level quality. All of the ALS series Flameproof valve monitor (Limit Switch box) fully meet ISO5211, Namur and IP67 standards. The mechanical switch, proximity sensor, magnet sensor, ASi sensor and DeviceNet sensor are all available in ALS series flameproof valve monitor (limit switch box).

Based on 94/9/EC of 23 March, EN13980, EN60079-0:2006 and EN60079-1:2004 production standards, ALS400/500/600 series flame proof limit switch box is certified for use in hazardous areas (Class I, Div. 1&2, Group A, B, C and D, Ex d IIB T6, Ex d IIC T6)). Because of the stainless steel (304/316/316L) enclosure, ALS600 series limit switch box / valve monitor can offer excellent resistance to most corrosive chemicals as well as hazardous industrial atmospheres.