The SAM Electronics DZM 402 is a marine-grade speed relay module designed for monitoring and controlling rotational speed in marine diesel engines and auxiliary machinery. Manufactured by SAM Electronics (Lyngsoe Marine A/S), it features dual RS485 communication interfaces, configurable operation modes, and robust industrial construction. The module provides real-time speed detection, over-speed/under-speed protection, and relay output for system control, making it a critical component in ship engine room automation systems.
