The NEXUS 1250 is a revenue-grade power quality monitor manufactured by EIG (Electro Industries/GaugeTech). It is widely deployed in power substations, power plants and industrial distribution systems, delivering high-accuracy energy metering, power quality waveform recording and data acquisition for SCADA integration.

Model Code Definition

1250-120-D2-60 HZ-2E-GETC

• 1250: Product series designation
• 120: Nominal secondary PT voltage 120V phase voltage
• D2: Dual isolated RS485 communication ports
• 60 HZ: Rated operating frequency for North American grid
• 2E: 2-channel expandable I/O configuration
• GETC: Standard feature package including harmonic analysis, event recording, Modbus RTU and DNP3.0 protocol support with time-stamped data logging

 

Key Technical Specifications

1. Metering AccuracyActive energy accuracy up to 0.04% at full load unity power factor, compliant with ANSI C12.20 and IEC62053-22 revenue metering standards. Equipped with Accu-Measure automatic temperature compensation technology.
2. Measurement FunctionsThree-phase voltage, current, power, power factor, demand and bidirectional energy values. Real-time harmonic measurement up to 128th order; high-speed fault waveform capture with up to 512 samples per cycle for voltage sag and transient disturbance detection.
3. Communication (D2 Version)Dual isolated RS485 ports; supports Modbus RTU and DNP3.0. Optional INP200 Ethernet module available for Modbus TCP expansion.
4. Hardware I/O (2E)Programmable digital inputs, relay outputs and analog outputs. Designed for status signal acquisition, alarm actuation and 4–20mA analog transmission.
5. Power Supply & InsulationUniversal operating power: 90–276V AC/DC. 2500V isolation between signal circuits. Wide operating temperature range: -40℃ ~ +70℃.
6. Data StorageLarge-capacity non-volatile NVRAM for permanent storage of energy profiles, disturbance logs and event records; data remains intact after power loss.

 

Typical Industrial Applications

• Main revenue metering for power plant auxiliary systems and substation feeders
• Power distribution monitoring for large petrochemical, oil & gas facilities
• Automation system data source for DCS and SCADA on 60Hz North American power projects

Note: The NEXUS 1250 shares similar form factor with NEXUS 1252. The 1252 additionally supports flicker measurement and EN50160 statistics. The 1250 does not include flicker functions and cannot be directly substituted.

 

Sourcing & Replacement Guidelines

1. The full part number 1250-120-D2-60 HZ-2E-GETC must be fully matched. Units with different voltage class, frequency, communication options or I/O suffixes are not drop-in compatible.
2. After hardware replacement, use Communicator EXT software to download configuration parameters including CT/PT ratios, wiring scheme, communication addresses and alarm thresholds.
3. Original new lead times are generally lengthy. Pre-owned spare units require verification of metering precision and communication channel integrity.
4. Strictly follow wiring specifications: avoid open-circuit CT secondary circuits and properly install fuses on PT secondary loops.

 

Common Field Faults

• Communication failure: caused by incorrect RS485 polarity, missing termination resistor or address conflict
• Abnormal metering: reversed CT polarity or incorrect ratio parameter setup
• Failure to save historical events: degradation of internal NVRAM

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