Requirements for the Installation of Temperature Sensing Optical Cables

Proper installation of temperature-sensing optical cables ensures accurate temperature monitoring, system reliability, and safety in high-voltage or critical infrastructure applications.

Pre-Installation Preparation

Before installation, select the appropriate fiber optic model based on system requirements and verify its technical specifications and certificate of conformity. Inspect the fiber for any physical damage and store it upright in a cable tray to prevent bending or crushing . Conduct a site survey and route planning to identify cable paths, obstacles, and environmental conditions, ensuring the installation meets safety and operational standards .

Handling and Laying Fiber Optics

• Cable Unwinding: Use a slender rod through the center of the cable reel and lay the reel flat to allow smooth rotation. Avoid twisting, stretching, or impacting the fiber .
• Bending Radius: Maintain a minimum bending radius of 30mm for temperature-sensing fibers, and ensure arcs are greater than 5cm to prevent measurement inaccuracies .
• Wall and Pipe Passages: Avoid damaging the fiber when passing through walls or conduits. For long pipelines, multiple fibers should pass simultaneously rather than in stages .
• Slack and Testing Sections: Leave 1 meter of fiber every 100 meters and reserve 20-meter testing sections for system debugging .

Cable Fixing and Routing

• High-Voltage Cables: Attach temperature-sensing fibers along the cable using flame-retardant ties. For multiple cables, an S-shaped wiring maximizes coverage and material efficiency .
• Cable Trenches and Corridors: Protect fibers from external damage and ensure they remain intact for accurate temperature sensing .
• Environmental Protection: In high-humidity environments, use moisture-proof measures and insulation climbers to prevent condensation on the fiber surface .

System Integration

• Connector Installation: Check that connectors are clean before installation. Lay the fiber first, then attach connectors to maintain system integrity .
• DTS System Compatibility: Temperature-sensing fibers are compatible with Distributed Temperature Sensing (DTS) systems, which provide continuous monitoring along the fiber length using Raman or Brillouin scattering .
• Safety Considerations: DTS fibers carry no electrical current and are safe for high-voltage environments. Proper installation ensures no flashover occurs even under 95kV power frequency voltage .

Best Practices

• Avoid excessive twisting, stretching, or impact during installation.
• Maintain proper bending radius and slack to prevent fiber damage.
• Reserve testing sections for calibration and system verification.
• Protect fibers from moisture, mechanical stress, and environmental hazards.
• Coordinate with fiber sensing suppliers for cable selection and installation guidance to optimize system performance . By following these guidelines, temperature-sensing optical cables can provide accurate, reliable, and continuous temperature monitoring, enhancing operational safety and maintenance efficiency in critical infrastructure.