Siemens ZN-34US ? Used

DescriptionDesigned for use with System 3 Control Panels, the Sprinkler Valve Supervision Modules, ZN-34US and ZN-34UA, are designed to provide two circuits for the supervision of sprinkler system gate valves and ancillary equipment in accordance with NFPA Standard 72. The module provides two yellow LED indicators per circuit. The first illuminates when a supervisory condition exists and the second when a circuit trouble condition occurs.