**OID-202 Display Unit for Metron FD4 Diesel Fire Pump Controller** is an advanced Operator Interface Device (OID) designed for monitoring, control, and diagnostics of Metron FD4 Diesel Fire Pump Controllers. Featuring a large backlit LCD display, the OID-202 provides real-time system information including pump status, system pressure, battery voltage, battery charger current, alarm conditions, engine parameters, and event history. The user-friendly interface includes navigation and control buttons for easy system configuration, alarm acknowledgment, testing, and operational monitoring. Engineered for critical fire protection applications, the OID-202 enhances system reliability, simplifies troubleshooting, and ensures compliance with NFPA 20 fire pump controller requirements. Its rugged construction and intuitive display make it ideal for industrial, commercial, and fire protection installations.