ALS series ASi Valve Monitor including 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 ASi Valve Monitor to be solid, beautiful and with high-level quality. All of the ALS series ASi Valve Monitor fully meet ISO5211, Namur and IP67 standards. The ASi sensor and DeviceNet sensor are all available in ALS series ASi Valve Monitor.

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 / ASi Valve Monitor can offer excellent resistance to most corrosive chemicals as well as hazardous industrial atmospheres.