DITRA L20 Tunnel Luminance Meter
High-accuracy tunnel luminance sensor with RS-485 / Modbus RTU and 4–20 mA interfaces
The DITRA Luminance Sensor is an intelligent luminance measurement device designed specifically for tunnel entrance and tunnel lighting control applications.
The sensor continuously measures environmental luminance and provides real-time data to the tunnel lighting control system, allowing lighting levels to be automatically adjusted according to actual entrance brightness conditions.
With an integrated optical sensor, local digital display, industrial communication interfaces and alarm outputs, the device can be easily integrated into tunnel control cabinets, PLC systems, SCADA platforms
- Designed for Tunnel Luminance Measurement
- Measurement Range up to 7,000 cd/m²
- RS-485 Digital Communication
- Modbus RTU Protocol
- 4–20 mA Analog Output
- Integrated Real-Time Digital Display
- Configurable Alarm Outputs
- Wide Measuring Angle
- No Moving Parts
- IP67 Weatherproof Enclosure
- Wide Operating Temperature Range
- Wall-Mount Installation
- Easy Integration with PLC, SCADA and Tunnel Lighting Control Systems
- Mechanical
Installation: Wall mounting
Weight: Approx. 3 kg
Construction: Integrated sensor without moving parts
Recommended Installation: Tunnel entrance area with the sensor directed toward the tunnel entrance field of view
- Power & Electrical
Supply Voltage: 220 VAC ±15%
Frequency: 50 Hz
Rated Power Consumption: 5 W
Maximum Power Consumption: 8 W
Short-Circuit Protection: Fuse protected- Environment
Operating Temperature: -55°C to +65°C
Operating Humidity: 0–100% RH, non-condensing
Protection Rating: IP67- Compliance & Standards
Certification: CE, RoHS
- Control & Data Connections
Digital Interface: RS-485
Communication Protocol: Modbus RTU
Analog Output: 4–20 mA
Maximum Analog Output Load: 500 Ω
Alarm Outputs: Relay outputs
Baud Rate: 9,600 bps
Data Bits: 8
Parity: Even
Stop Bits: 1- Inputs / Outputs
1 × RS-485 digital communication interface
1 × 4–20 mA analog luminance output
Relay alarm outputs
- Configuration / Indication
Local Display: Five-digit real-time luminance display
Local Controls: SET / REG configuration buttons
Power Indicator: Integrated
Alarm Threshold: Locally configurable
Power Switch: Integrated
- Package Contents
DITRA L20 Tunnel Luminance Meter
Warranty: 36 month