The Bacharach Model HGM-MZ Multi-Zone (tube) Refrigerant Gas Monitor is designed for continuous multi-point monitoring of CFC, HFC, and HCFC refrigerants and halogen gases. The standard unit monitors four discrete points and can be expanded to sixteen point monitoring in four point increments. The unit features 43 pre-programmed refrigerants plus one custom gas. Three adjustable alarm levels with relay output designate leak, spill, and evacuation concentrations. Gas alarms and system fault conditions are indicated by visual and audible alarms. The Model HGM-MZ provides a system fault relay output and RS-485 serial interface for integration with a building management system.The HGM-MZ Multi-Zone (tube) Refrigerant Gas Monitor is designed to be used as part of a control system that helps to prevent the formation of a hazardous environment when properly installed and maintained. Kele is the leading supplier of building automation products. When you need the right product, right now, count on Kele.. For more information on the proper application and use of this product please read 'Environmental Safety Devices' in our technical reference section.