CHQ-DZM(SCI)-IS HFP Intrinsically Safe Compatible Dual Zone Monitor with SCICHQ DZM(SCI) IS Intrinsically Safe Compatible Dual Zone Monitor with SCI Manufactured by Hochiki, this Hochiki CHQ DMZ (SCI) IS HFP Intrinsically Safe Compatible Dual Zone Monitor With SCI is Dual Zone Module which is fully compatible with Hochiki's ESP analogue addressable protocol and I. S. equipment. It is supplied as an OEM version (as illustrated) which can be fitted within an IP67 rated enclosure. The unit is also available as a DIN Rail