The DEIF ADL-111Q96 DC Insulation Monitor stands as a premium-grade electrical safety instrument designed and engineered by DEIF Group (Denmark) specifically to afford continuous, comprehensive protection across ungrounded direct current power grids (unearthed IT DC networks). Within modern maritime and automated heavy-duty industrial infrastructures, isolated DC grids are widely adopted because they inherently maintain power availability even when a primary single-phase insulation fault to earth occurs. However, if this first insulation compromise goes unnoticed and uncorrected, a subsequent earth fault on the opposite pole will immediately generate a high-magnitude catastrophic short circuit, destroying connected equipment and threatening operator safety alongside systemic fire hazards. The DEIF ADL-111Q96 counteracts this hazard by superimposing a minute specialized measuring voltage signal between the DC system grid and the protective earth ground, continuously measuring leakage currents to resolve the definitive insulation resistance in real-time.

The device features an informative mechanical pointer display bundled with highly integrated internal measuring electronics encased in a standardized DIN 96x96 mm quadrant profile (Q96). The system houses built-in dry-contact alarm relay units providing fully adjustable threshold settings (Alarm Setpoint). When the measured insulation resistance degrades below the preset safe ohmic threshold, the internal relays trip immediately to fire secondary acoustic-visual warning matrices or send alarm signals to centralized Power Management Systems (PMS). Engineered with absolute ruggedness, the ADL-111Q96 holds type approvals from globally renowned marine classification authorities such as DNV-GL, LR, ABS, and BV, delivering flawless operational stability against heavy mechanical vibration profiles, elevated engine room ambient heat, and high-salinity marine environments. This meter represents a mandatory component for critical Main Switchboards, high-capacity Battery Energy Storage Systems (BESS), maritime vessel emergency lines, and deep industrial automation enclosures.

• Manufacturer: DEIF
• Country of Origin: Denmark
• Product Type: Insulation Monitoring Device for Ungrounded DC Networks
• Model Designation: ADL-111Q96
• Monitored Network Profile: Unearthed / Isolated IT DC networks
• Measurement Principle: Superimposed measuring voltage method
• Insulation Resistance Range: 0...1 MΩ or 0...10 MΩ (Variant specific configuration)
• Rated Monitored DC Grid Voltage: Up to 300V DC directly (Higher voltage thresholds supported via external resistor divider couplers)
• Independent Auxiliary Supply: 110V AC, 230V AC, 24V DC, or 110V DC (As specified per ordering setup)
• Output Alarm Signalization: Integrated changeover dry-contact relays (Trips on low insulation resistance levels)
• Alarm Setpoint Calibration: Front-accessible potentiometer dial or electronic configuration parameters
• Display Accuracy Classification: Class 1.5 according to international standard IEC 60051 specifications
• Environmental Protection Ingress: IP52 front pointer bezel display, IP20 rear screw wire terminals according to IEC 60529
• Operating Temperature Limits: -25°C to +60°C (Certified for harsh tropical maritime climates)
• Mounting Profile: Flush panel installation conforming to standardized DIN 96 x 96 mm cutouts
• Standards & Class Compliance: CE marked, RoHS compliant, Marine Type Approved by DNV-GL, ABS, Lloyd's Register (LR), Bureau Veritas (BV)