1. Product Overview
The INK454 Tunnel Illumination Detector is a precision light-level sensor designed for road tunnel environments. It measures ambient illumination and converts readings into industrial-standard signals to intelligently control tunnel lighting equipment. Installed at entrances, transitions, or mid-tunnel sections (at ~3 m height), the device uses a cosine-corrected silicon photocell to accurately reflect road surface brightness, ensuring safe visibility for drivers. With robust environmental protection and low temperature drift, it delivers reliable performance in harsh tunnel conditions.
2. Sensing Technology & Self-Cleaning System
Sensing Technology:
The core of the detector is a high-precision silicon photocell paired with a cosine corrector, which ensures accurate light intensity measurement regardless of the angle of incidence. A high-efficiency filter processes the signal, and automatic temperature compensation minimizes drift in extreme conditions. The sensor converts light levels into proportional electrical signals, which are then output as analog (4–20 mA) or digital (RS485/RS232) formats.
Environmental & Maintenance Design:
While no explicit self-cleaning mechanism is specified, the IP66-rated enclosure protects against dust, water spray, and moisture. An internal heating element prevents condensation buildup, reducing the need for routine maintenance and ensuring stable operation in high-humidity tunnel environments.
3. Key Features & Competitive Advantages
- High Accuracy & Stability: Calibrated at 25°C with auto-correction of errors to ≤±1%, ensuring reliable light-level data for critical lighting control decisions.
- Cosine-Corrected Photocell: Accurately reflects road surface illumination by compensating for light incidence angles, a key advantage over standard light sensors.
- Fast Response & Linearity: Instantaneous response to light changes with excellent linearity between luminance and photocurrent, ideal for dynamic tunnel lighting control.
- Multiple Output Options: Supports analog 4–20 mA and digital RS485/RS232 (selectable), enabling seamless integration with various tunnel control systems.
- Temperature Compensation: Built-in compensation minimizes drift in extreme temperatures (-40°C to +80°C), ensuring consistent performance year-round.
- IP66 Protection: Waterproof and dustproof design withstands rain, water spray, and dust, suitable for exposed tunnel entrance and transition zones.
- Anti-Condensation Heating: Internal heating prevents condensation, eliminating the risk of sensor failure in high-humidity environments.
- Long Operational Life: Rated for ≥50,000 hours of continuous use, reducing maintenance costs and downtime.
4. Technical Specifications
| Parameter |
Specifications |
| Measurement Range |
0 ~ 20,000 Lux |
| Measurement Angle |
Vertical ≥20°, Horizontal ≥20° |
| Measurement Error |
±1 % |
| Protection Class |
IP66 |
| Analog Output |
4 ~ 20 mA (proportional to range) |
| Digital Output |
RS485 or RS232 (selectable) |
| Operating Temperature |
-40 °C ~ +80 °C |
| Operating Humidity |
0 ~ 100 %RH |
| Power Supply |
AC 220 V / DC 12 V |
| Operating Life |
≥50,000 hours |
| Installation |
Wall-mounted (at ~3 m height) |
| Weight |
Approx. 1 kg (excluding bracket) |
5. Applications
- Road tunnel lighting control systems
- Highway tunnel entrance/transition zone illumination monitoring
- Urban underground transportation safety systems
- Railway tunnel light level regulation
- Smart city tunnel management platforms
- Energy-efficient lighting control in tunnels
- Compliance with tunnel safety standards for driver visibility
- Integration with SCADA and building automation systems
