INNO fibre optic temperature sensors ,temperature monitoring systems.
FJINNO's Premium Fluorescent Fiber Optic Extension Cables provide superior optical signal transmission for temperature sensing systems with minimal light loss (≤0.2dB per connection). Engineered with high-purity quartz glass fibers and reinforced protective jacketing, these cables withstand extreme environments from -40°C to +260°C while delivering excellent mechanical durability with tensile strength exceeding 100N. Available in customized lengths up to 30 meters with ST, SC, or LC connectors featuring UPC spherical polishing, these extension cables maintain measurement accuracy across extended distances in applications including oil-immersed transformer winding monitoring, gas-insulated switchgear, enclosed bus ducts, and industrial equipment, with complete electromagnetic immunity and exceptional vibration resistance.
Premium Fluorescent Fiber Optic Extension Cables
FJINNO's Premium Fluorescent Fiber Optic Extension Cables represent the critical link between fiber optic temperature sensors and signal processing equipment in advanced temperature monitoring systems. Engineered specifically for power system applications, particularly oil-immersed transformers and gas-insulated switchgear, these high-performance extension cables ensure reliable signal transmission while maintaining the measurement accuracy and electromagnetic immunity that make fiber optic sensing superior to conventional technologies.
Superior Optical Performance
Manufactured with high-purity quartz glass fiber cores that deliver exceptional light transmission properties with minimal signal attenuation (≤0.3dB/km), ensuring accurate temperature measurements even over extended distances. The precision-engineered optical connections feature UPC spherical polishing that minimizes backreflection and insertion loss, maintaining signal integrity throughout the monitoring system.
Exceptional Mechanical Protection
The multi-layer reinforced construction provides superior protection against tensile stress, crushing forces, and repeated bending while maintaining necessary flexibility for complex routing requirements. With tensile strength exceeding 100N and crush resistance up to 1000N/10cm, these cables withstand the rigors of industrial installations while ensuring long-term reliability in demanding environments.
Comprehensive Environmental Resistance
Engineered to perform reliably in extreme conditions, with operating temperature range from -40°C to +260°C and specialized jacketing materials that resist UV radiation, moisture, oils, and common industrial chemicals. This environmental durability ensures consistent performance in transformer installations, switchgear applications, and power generation equipment over decades of service.
Technical Specifications
| Parameter | Specification |
|---|---|
| Fiber Type | High-purity quartz glass multimode fiber |
| Core/Cladding Diameter | 200/230μm (other options available) |
| Optical Attenuation | ≤0.3dB/km at signal wavelength |
| Connection Loss | ≤0.2dB per connection |
| Cable Diameter | 3.0mm (standard) / 2.5-6.0mm (application-specific options) |
| Jacket Material | High-performance polymer with reinforcement layers |
| Available Lengths | 0.5m to 30m (custom lengths available) |
| Connector Types | ST (standard), SC, LC, FC/PC (optional) |
| Connector Finish | UPC spherical polished |
| Minimum Bend Radius | 30mm (static) / 60mm (dynamic) |
| Temperature Range | -40°C to +260°C |
| Tensile Strength | >100N |
| Crush Resistance | 1000N/10cm |
| Water Resistance | IP67 rated connections |
| Chemical Resistance | Resistant to oils, fuels, mild acids, and alkalis |
| UV Resistance | High - suitable for outdoor installations |
| Expected Lifetime | 25+ years in specified environments |
Primary Application Areas
Oil-Immersed Transformer Winding Temperature Monitoring
FJINNO extension cables provide the critical connection between in-transformer sensors and external monitoring equipment, routing through transformer tank walls via specialized feedthrough assemblies. The cables maintain complete signal integrity while ensuring perfect oil-tight seals, essential for long-term transformer reliability.
Our extension cables have been successfully deployed in numerous transformer installations across China, including major power grid transformers in Beijing, Shanghai, Guangdong, and Sichuan provinces, demonstrating exceptional reliability in various regional operating conditions.
Gas-Insulated Switchgear (GIS) Temperature Monitoring
For gas-insulated switchgear and enclosed bus duct systems, our extension cables allow temperature monitoring signals to be transmitted safely outside the enclosed high-voltage environment. Their complete electromagnetic immunity ensures measurement accuracy even in intense electric fields where conventional sensor wiring would fail.
Successful installations include multiple 500kV and 750kV substations throughout China's national grid, where our extension cables have provided reliable service in critical power distribution nodes for over a decade.
Additional Application Areas
Enclosed High-Voltage Bus Ducts
Our extension cables facilitate temperature monitoring of critical connection points within enclosed bus duct systems, enabling early detection of developing thermal issues in these crucial power transmission components.
Wind Turbine Blade Monitoring
The exceptional mechanical durability of our extension cables makes them ideal for transmitting temperature data from sensors embedded in wind turbine blades. Their flexibility, vibration resistance, and wide temperature range ensure reliable operation despite extreme mechanical stresses.
Connector and Terminal Temperature Measurement
Our extension cables effectively route temperature signals from critical electrical connections to safe monitoring locations, enabling early detection of connection degradation without compromising electrical clearances or introducing safety hazards.
Conductive Bus Bar Surface Monitoring
For high-current distribution systems, our cables transmit temperature data from bus bar surfaces to monitoring equipment, maintaining complete electrical isolation while ensuring reliable signal transmission even in intense magnetic fields.
Medical and Human-Contact Applications
The biocompatible jacketing options and complete electrical isolation make these extension cables ideal for medical applications where temperature sensors may contact patients, ensuring absolute safety while delivering precise temperature measurements.
High-Voltage Cable Termination Monitoring
Our extension cables provide safe signal routing from temperature sensors at critical cable terminations to remote monitoring locations, enabling preventive maintenance through early detection of termination overheating.
Generator Slip Ring Temperature Measurement
The exceptional durability of our extension cables ensures reliable temperature monitoring of generator slip rings despite the challenging combination of rotational forces, carbon dust, and electrical arcing present in these critical power generation components.
Semiconductor Manufacturing Equipment
For etching machines, deposition equipment, and electrostatic chucks, our extension cables provide reliable temperature signal transmission from critical monitoring points to control systems, withstanding harsh chemical environments.
Hydroelectric, Thermal, and Wind Power Generators
Our extension cables enable comprehensive temperature monitoring throughout power generation equipment, with specialized versions available for the unique requirements of different generator types.
Ring Main Unit Temperature Monitoring
For compact medium-voltage distribution equipment, our extension cables route temperature signals from critical connection points to external monitoring systems, enabling condition-based maintenance while maintaining the sealed integrity of the switchgear.
Outdoor Electrical Equipment
The UV-resistant jacketing and wide temperature range make these extension cables ideal for routing temperature signals from outdoor electrical equipment, ensuring reliable monitoring despite exposure to solar radiation and extreme temperatures.
Chinese Implementation Case Studies
State Grid Corporation 1000kV UHV Transformer Installation
FJINNO extension cables were deployed in China's first 1000kV UHV transformer installation, providing critical temperature monitoring for this nationally important power infrastructure project. The cables have maintained perfect signal integrity since installation, contributing to the project's exceptional reliability record.
Three Gorges Dam Hydroelectric Generator Monitoring
Our extension cables form a critical component of the temperature monitoring system for hydroelectric generators at the Three Gorges Dam, demonstrating exceptional resistance to moisture, vibration, and mechanical stress in this challenging environment.
Shanghai Metro Traction Substation GIS Monitoring
FJINNO extension cables have been successfully implemented in gas-insulated switchgear installations throughout the Shanghai Metro power distribution system, providing reliable temperature monitoring that has helped prevent potential service disruptions through early detection of developing thermal issues.
Xinjiang Wind Farm Installation
Our extension cables have proven their durability in the extreme desert conditions of Xinjiang wind farm installations, maintaining reliable temperature monitoring despite temperature extremes, sand exposure, and high UV radiation levels that rapidly degrade conventional cables.
Advanced Construction Features
Precision Quartz Fiber Core
The heart of our extension cables is a high-purity quartz glass fiber with precisely controlled core and cladding dimensions. This premium optical material ensures minimal signal attenuation and optimal transmission of the fluorescence signals critical for accurate temperature measurement. Unlike conventional communications fiber, our specialized fiber is optimized for the specific wavelengths used in fluorescent temperature sensing.
Multi-Layer Protection System
Our extension cables feature a sophisticated multi-layer construction that provides both mechanical protection and environmental sealing:
- Primary coating buffer directly on the glass fiber
- Secondary protective buffer for additional mechanical isolation
- Aramid fiber strength members for superior tensile strength
- Specialized outer jacket material selected for specific environmental requirements
This engineered approach ensures both excellent protection and the flexibility needed for complex installation requirements.
Precision Connector Technology
Each cable features precision-manufactured connectors with UPC spherical polished end faces that minimize connection losses and backreflection. The connectors are permanently factory-installed using specialized equipment that ensures perfect fiber alignment and optimal optical performance. This attention to connector quality is critical for maintaining measurement accuracy across the complete monitoring system.
Integrated Strain Relief
The connector-to-cable interface includes engineered strain relief features that prevent stress concentration at this critical junction. This design element ensures reliable performance even when cables experience repeated handling, bending, or tension during installation and service, eliminating a common failure point in fiber optic systems.
Key Advantages Over Standard Communication Fibers
Optimized Optical Properties
Unlike standard telecommunication fibers, our extension cables are specifically designed for fluorescent temperature sensing applications, with optical properties optimized for the excitation and emission wavelengths used in temperature measurement rather than communications wavelengths.
Superior Mechanical Protection
Standard communication fibers typically prioritize bend performance and compact dimensions over mechanical durability. Our extension cables feature reinforced protection specifically engineered for industrial environments where mechanical stress, vibration, and harsh conditions are common.
Enhanced Environmental Resistance
Communication fibers are generally designed for controlled environments or buried installations. Our extension cables utilize specialized jacketing materials selected for resistance to industrial chemicals, oils, UV radiation, and extreme temperatures encountered in power systems and industrial applications.
Precision Connection Technology
While communications systems can often tolerate minor connection losses, temperature measurement accuracy depends on minimal connection losses. Our extension cables feature precision connectors with UPC spherical polishing that ensures optimal signal transmission at every connection point.
System-Optimized Performance
Each component of our extension cables is specifically selected to work seamlessly with FJINNO fluorescent temperature sensing systems, ensuring optimal signal quality, measurement accuracy, and long-term reliability across the complete monitoring solution.
Application-Specific Options
Unlike general-purpose communication fibers, our extension cables are available with application-specific customizations such as specialized jacketing for specific chemical environments, enhanced flexibility for complex routing requirements, or reinforced variants for high-vibration applications.
Customization Options
FJINNO offers extensive customization options for Premium Fluorescent Fiber Optic Extension Cables to address specific application requirements:
Length Customization
Available in precise lengths from 0.5m to 30m, manufactured to exacting specifications for each application. Custom intermediate lengths are produced with the same high-precision termination and testing standards as standard lengths, ensuring optimal performance for your specific installation requirements.
Connector Options
While ST connectors are standard, we offer multiple connector alternatives including:
- SC connectors for secure snap-in connections
- LC connectors for high-density applications
- FC/PC for applications requiring threaded connections
- Hybrid cables with different connectors at each end for system integration
Environmental Protection Options
Specialized jacketing materials available for specific environmental challenges:
- LSZH (Low Smoke Zero Halogen) for indoor applications
- Enhanced chemical resistance for semiconductor environments
- Extreme temperature variants for furnace applications
- Metal-armored options for severe mechanical protection requirements
Bundle Configurations
For multi-sensor systems, bundled cable options include:
- Multiple fibers in a single protective jacket
- Numbered or color-coded fibers for easy identification
- Hybrid bundles combining sensing fibers with conventional communications fibers
- Breakout sections for routing to distributed measurement points
Quality Assurance and Testing
Every FJINNO Premium Fluorescent Fiber Optic Extension Cable undergoes rigorous testing to ensure exceptional performance and reliability:
Optical Performance Testing
Each cable undergoes comprehensive optical testing including:
- Insertion loss measurement at operational wavelengths
- Backreflection measurement to verify connector polish quality
- End-to-end transmission verification with actual sensing equipment
- Full functional testing in temperature measurement applications
Mechanical Durability Testing
Our cables are subjected to extensive mechanical testing:
- Tensile strength testing to verify load capacity
- Repeated bend testing to ensure flexibility without performance degradation
- Crush resistance verification under controlled conditions
- Connector retention strength testing
Environmental Resistance Verification
Cables undergo environmental testing appropriate to their intended applications:
- Temperature cycling across the full operational range (-40°C to +260°C)
- Chemical exposure testing for industry-specific environments
- UV and weather resistance testing for outdoor applications
- Humidity and water immersion testing for IP67-rated variants
System Integration Testing
Before shipping, cables are tested as part of complete measurement systems:
- End-to-end accuracy verification with actual sensors and demodulators
- Signal stability monitoring across temperature ranges
- Compatibility testing with all FJINNO sensor types
- Long-term reliability simulation under operational conditions
Advantages of Fluorescent Fiber Optic Temperature Monitoring
| Monitoring Parameter | Fluorescent Fiber Optic System | Conventional Temperature Monitoring |
|---|---|---|
| Electromagnetic Immunity | Complete immunity to electromagnetic fields of any strength | Susceptible to EMI/RFI interference and measurement errors |
| Electrical Isolation | Inherently non-conductive, eliminating ground loops and electrical safety concerns | Requires special isolation measures to prevent ground loops and electrical hazards |
| Measurement Accuracy | ±1°C across full temperature range (-40°C to +260°C) | Accuracy degrades at temperature extremes and in electromagnetic fields |
| Long-Term Stability | No calibration drift over 25+ year lifetime | Requires periodic recalibration to maintain accuracy |
| Response Time | Fast response (<100ms) with direct hot-spot measurement | Slow response (often minutes) with indirect measurement |
| Spatial Resolution | Precise point measurement at actual hot spots | Often limited to accessible locations, not actual hot spots |
| High Voltage Safety | Intrinsically safe in high-voltage environments up to 1000kV | Requires special high-voltage isolation and protection |
| Chemical Resistance | Excellent resistance to transformer oil, chemicals, and contaminants | Often degrades in chemical environments |
| Distributed Sensing | Multiple sensing points can share a single demodulator | Typically requires separate instrumentation for each point |
| Signal Transmission | Long distance transmission without signal degradation | Signal quality degrades over distance, requiring signal conditioners |
Frequently Asked Questions
How do extension cables affect temperature measurement accuracy?
One of the key advantages of FJINNO's fluorescent temperature measurement technology is that extension cable length has minimal impact on measurement accuracy. This is because:
- The measurement is based on fluorescence decay time rather than signal intensity
- Decay time measurement remains accurate regardless of light intensity variations caused by fiber length or bending
- Our precision connectors maintain optical integrity with minimal connection losses (≤0.2dB per connection)
- System calibration accounts for the specific extension cables used in each installation
This inherent immunity to cable effects allows reliable temperature monitoring even with extension cables up to 30 meters long, maintaining the system's full ±1°C accuracy specification.
Are the extension cables interchangeable between different sensor types?
FJINNO's extension cables are designed for maximum compatibility across our product lines:
- All standard extension cables are compatible with our complete range of fluorescent fiber optic temperature sensors
- Connector types (ST, SC, LC) must match between sensors, extension cables, and demodulators
- Specialized sensors may require specific extension cable types for optimal performance
- System calibration accounts for the specific extension cables used, so replacement cables should have similar optical properties
For critical applications, we recommend using extension cables specifically selected and tested with your particular sensor and demodulator combination to ensure optimal performance and measurement accuracy.
How should extension cables be installed to ensure reliability?
While our extension cables are engineered for durability, following these installation best practices maximizes long-term reliability:
- Observe the minimum bend radius (30mm static/60mm dynamic) to prevent stress on the fiber
- Use proper cable management systems to secure cables without pinching or crushing
- Protect connectors from contamination during installation; clean properly before making connections
- Provide strain relief at connection points to prevent tensile forces from affecting connectors
- In outdoor installations, provide drip loops to prevent water ingress into equipment
- Maintain separation from high-voltage cables according to applicable electrical codes
Our installation guidelines provide detailed, application-specific recommendations to ensure optimal performance and reliability throughout the system's operational life.
What maintenance is required for extension cables?
FJINNO extension cables are designed for minimal maintenance requirements:
- Periodic visual inspection of cable jacket for damage or degradation
- Inspection of connectors for secure attachment and physical integrity
- Cleaning of connector end faces if disconnected for any reason before reconnection
- Verification of cable routing and support to prevent mechanical stress
- No optical performance degradation occurs over time if cables remain undamaged
The all-glass optical path does not degrade over time, ensuring stable optical performance for decades of operation. Most maintenance focuses on preventing and identifying physical damage rather than addressing performance deterioration.
Why are FJINNO's fiber optic temperature monitoring systems superior to conventional methods?
FJINNO's fluorescent fiber optic temperature monitoring technology offers several fundamental advantages over conventional methods:
- Direct Hot-Spot Measurement: Sensors can be placed directly at critical hot spots within windings rather than inferring temperatures from indirect measurements
- Complete Electromagnetic Immunity: Purely optical systems are unaffected by the intense electromagnetic fields present in transformers and switchgear
- Superior Accuracy: ±1°C accuracy across the full temperature range without degradation due to electromagnetic interference
- Inherent Electrical Isolation: Non-conductive fiber eliminates ground loops and electrical safety concerns in high-voltage environments
- Long-Term Stability: No calibration drift over 25+ year lifetime, unlike conventional sensors that require regular recalibration
- Enhanced Safety: No electrical components within high-voltage areas, eliminating potential failure points and safety risks
These advantages translate to more accurate temperature monitoring, improved transformer loading capacity, extended asset life, and reduced maintenance requirements compared to conventional temperature monitoring technologies.
Disclaimer
The product specifications and information provided on this website are for reference purposes only. FJINNO continuously improves and updates our products, and actual specifications may vary from those listed. To avoid any inconvenience or potential disputes, please contact us directly to obtain the most current and accurate product information and specifications before placing an order. While we strive to ensure the accuracy of all information presented, FJINNO reserves the right to make changes without notice and assumes no liability for any discrepancies between published specifications and actual product characteristics.
