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1. Technical Specifications
The ZYGO ZMI-4004 is a high-precision laser interferometer system designed for advanced metrology applications. Key specifications include:

1. Technical Specifications

• Device Type: Single-channel dissolved gas analyzer (DGA) controller for transformer oil monitoring.
• Sensors Supported:
  • Measures key fault gases: Hydrogen (H₂), Carbon Monoxide (CO), Acetylene (C₂H₂), Ethylene (C₂H₄), Methane (CH₄).
  • Optional configuration for additional gases (e.g., Oxygen, Nitrogen).
• Measurement Range:
  • H₂: 0–2000 ppm (with extended range options).
  • Other gases: Adjustable based on sensor calibration.
• Accuracy:
  • ±10% of reading for H₂ (typical).
  • ±15% for other gases (CO, C₂H₂, C₂H₄).
• Response Time:
  • <5 minutes for 90% step change in gas concentration.
• Output Signals:
  • Analog: 4–20 mA (isolated or non-isolated), 0–1 V, 0–10 V (configurable via jumpers).
  • Digital: RS-232, RS-485 (Modbus RTU/ASCII protocol support).
• Alarms:
  • Programmable multi-level thresholds (e.g., “Alert,” “Alarm,” “Critical”).
  • Relay outputs: 2 × SPDT (Form C) contacts, rated for 250 VAC/30 VDC, 5 A.
• Display:
  • Front-panel LED display for real-time gas concentration (ppm).
  • Two alarm indicator LEDs (red/yellow).
• Power Supply:
  • 85–264 VAC, 47–63 Hz, or 24 VDC (optional).
  • Power consumption: <15 W.
• Environmental Rating:
  • Operating temperature: -20°C to +70°C (-4°F to +158°F).
  • Humidity: 5–95% RH (non-condensing).
  • Protection: NEMA 4X (IP66) enclosure for outdoor/indoor use.
• Communication:
  • RS-485: Supports up to 128 devices in a daisy-chain network.
  • RS-232: Direct connection to PC or modem.
  • Optional Ethernet/IP or Profibus DP via expansion modules.

2. Key Features

• Early Fault Detection:
  • Monitors transformer oil for incipient faults (overheating, partial discharge, arcing) by tracking dissolved gas trends.
• High Reliability:
  • Advanced sensor technology with built-in self-diagnostics and drift compensation.
  • Electromagnetic compatibility (EMC) compliance (IEC 61000-6-2).
• Flexible Configuration:
  • Modular design allows integration with Hydran H201Ti smart transmitters for multi-channel monitoring.
  • Analog output scaling (0–100% of range) and isolation options.
• Remote Monitoring:
  • Enables integration with SCADA/DCS systems via Modbus RTU/ASCII.
  • Web-based configuration (with optional Ethernet module).
• User-Friendly Interface:
  • On-screen menu for setting alarms, calibration, and diagnostics.
  • Local push-button control for manual testing and reset.
• Robust Design:
  • Wide temperature range and corrosion-resistant enclosure for harsh environments.
  • Overvoltage and surge protection (IEC 61000-4-5).

3. Applications

• Power Transformers:
  • Monitoring of large utility, industrial, and distribution transformers.
  • Preventive maintenance for critical infrastructure (substations, power plants).
• Switchgear & Reactors:
  • Detection of partial discharge in oil-filled equipment.
• Renewable Energy:
  • Wind turbine and solar farm transformer health monitoring.
• Industrial Facilities:
  • Steel mills, petrochemical plants, and mining operations.
• Research & Testing:
  • Laboratories analyzing transformer oil degradation under accelerated aging conditions.

4. Advantages

• Cost-Effective:
  • Single-channel design reduces upfront costs for smaller installations.
• Scalability:
  • Expandable to multi-channel systems using Hydran H201Ti transmitters.
• Proactive Maintenance:
  • Reduces unplanned outages by providing early warning of transformer faults.
• Compliance:
  • Meets IEEE C57.104, IEC 60599, and ASTM D3612 standards for DGA.

5. Optional Accessories

• Hydran H201Ti Smart Transmitter:
  • Additional gas sensors for multi-point monitoring.
• Wall-Mount Enclosure:
  • For indoor installations requiring NEMA 12/IP54 protection.
• Solar Power Kit:
  • Enables remote operation without grid power.
• Calibration Kit:
  • Includes traceable gas standards for field verification.

6. Certifications

• CE, UL, cUL, CSA, ATEX (Zone 2) (for hazardous locations).
• ISO 9001:2015 (manufacturing quality).

Conclusion

The GE ENERGY HYDRAN H201Ci-1 is a reliable, high-precision DGA controller designed for transformer health monitoring. Its flexibility, ruggedness, and remote connectivity make it suitable for a wide range of industrial and utility applications, ensuring early fault detection and reducing maintenance costs.

For further details, refer to the GE Digital Energy Hydran Product Catalog or contact GE Grid Solutions directly.

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