Brightness Sensor
MN-T20L Wall-Mounted Light Sensor | Smart Lighting Control
The MN-T20L Light Sensor is a high-precision wall-mounted illumination sensor designed for both indoor and outdoor lighting monitoring. Housed in a durable IP65-rated enclosure, it ensures reliable operation even in harsh environmental conditions such as dust, humidity, and rain.
Featuring RS-485 communication with the ModBus-RTU protocol, the MN-T20L supports configurable baud rates and device addresses, enabling flexible system setup and easy integration. With a long communication distance of up to 2000 meters and a wide 10–30V DC operating voltage range, it guarantees stable and efficient data transmission.
The MN-T20L is ideal for smart lighting control systems, energy-saving projects, and IoT-based lighting management. It is commonly paired with PLC (Power Line Carrier) gateways to achieve seamless connectivity and intelligent illumination adjustment.
Product Advantage
- High-Precision Light Detection: Measures illuminance from 0 to 200,000 Lux with high accuracy.
- RS-485 Communication: Supports ModBus-RTU protocol with configurable baud rate and device address; max. communication distance: 2000m.
- Robust Wall-Mounted Enclosure: Features an IP65-rated housing, making it suitable for outdoor and harsh environments.
- Seamless Integration: Compatible with MicroNature gateways for smart lighting applications.
- Compact Dimensions: 108 × 84.5 × 41 mm (L × W × H) for flexible installation.
Product Parameters
| Power Supply (Default) | 10–30V DC |
| Operating Temperature | -40°C to +60°C |
| Operating Humidity | 0% to 95% RH (Non-condensing) |
| Max. Power Consumption | 0.4W |
| Accuracy (Illuminance) | ±7% (@25°C) |
| Measuring Range (Illuminance) | 0–200,000 Lux |
| Long-Term Stability (Illuminance) | ≤5% per year |
| Response Time (Illuminance) | 0. 1s |
| Output Signal | RS-485 (Modbus Protocol) |
Dimensions
Wiring Method
1. Connect the PLC-RS485 Data Transmit Unit to the Light Sensor
Power Connection:
- Light Sensor DC12V+ → PLC-RS485 Unit DC12V+
- Light Sensor DC12V- → PLC-RS485 Unit DC12V-
RS485 Communication: - Light Sensor 485A → PLC-RS485 Unit RS485A
- Light Sensor 485B → PLC-RS485 Unit RS485B
2. Power the PLC-RS485 Unit with AC Mains
- L (Live) → L (Live)
- N (Neutral) → N (Neutral)
- E (Ground) → E (Ground)
Note: Do not connect 'L' and 'N' incorrectly to avoid affecting the normal operation.
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FAQ
1. What is the MN-T20L Light Sensor used for?
The MN-T20L Light Sensor is designed for real-time brightness and illumination monitoring in smart lighting systems. It helps automatically adjust lighting levels in street lights, warehouses, tunnels, and office buildings, improving energy efficiency and automation performance.