Siemens HZM Remote Conventional Zone ModuleModel HZM Z is an intelligent device that connects a single zone of conventional devices to an analog loop. Model HZM Z can power up to 15 two wire ionization and photoelectric smoke detectors (Siemens Models 3 or 11 series). Model HZM Z can power one (1) beam detector (Model PBA 1191) with no additional devices, and can also monitor listed alarm causing shorting devices, such as: water flow switches, thermal detectors, manual stations, etc.