Tunnel visibility detector

1.Tunnel visibility detector product introduction

Tunnel visibility detector is a special instrument for monitoring visibility inside the tunnel, with real-time monitoring, data transmission, early warning and other functions.The tunnel visibility detector works according to the transmission principle. The transmitter/receiver and the reflector are installed relative to each other. After fixed alignment using the bracket, the highly focused beam emitted by the optical component becomes a detection beam. The installation distance is 3 meters (round trip dual optical path, actual detection light The distance is 6 meters), due to the attenuation of dust, the receiver obtains the signal and then processes it into a measured value. According to the requirements of my country's "Road Tunnel Ventilation and Lighting Design Code", it is installed on the top or side wall of the tunnel.

This intelligent detector has a built-in compensation function. When the optical lens is contaminated, it can automatically perform gain compensation, thus ensuring a long maintenance cycle. The tunnel is a special tubular structure. Due to its small space and airtight characteristics, if the exhaust gas emitted by vehicles passing through the tunnel is not discharged in a timely and reasonable manner, it will cause the accumulation of CO and suspended particulate matter, which will directly affect the safety of the tunnel. The personal safety of tunnel vehicle drivers and maintenance staff.

Tunnel visibility detector is designed to collect VI/CO data online and provide it to the traffic supervision department to provide decision-making basis for tunnel ventilation and road safety.

2. Product features of Tunnel visibility detector

1. Visibility (VI) and carbon monoxide (CO) can be measured simultaneously or separately;

2. High-resolution visibility measurement;

3. The measurement is completely unaffected by other stray light sources;

4. Specifically designed for the harsh environment of tunnels;

5. Effectively avoid inability to measure caused by vibrations from the environment and passing vehicles;

6. Low installation, startup and maintenance costs;

7. The instrument comes with status display, fault alarm and data storage functions, which facilitates debugging and equipment maintenance;

8. Multiple output methods, convenient data collection;

9. Unique compensation function ensures a long maintenance cycle;

10. Non-contact, continuous monitoring of visibility;

11. Uses the latest microprocessor technology and operates completely digitally.

3. Technical parameters of Tunnel visibility detector

Installation method: wall mounting

Power supply mode: AC220V

Measured value: VI value: 1/m, CO concentration: PPM

Measuring principle: ray projection method

Measuring range: VI: 0--15×10-3 1/m, CO: 0--400PPM

Measuring distance: 6 meters optical path (probe installation distance 3 meters)

Accuracy: VI: ±0.0001 1/m, CO: ±1PPM

Output interval: 60 seconds

Digital output: RS485

Analog signal output: two channels 0/4mA-20mA (internal impedance is not large

at 500Ω)

Reliability: mean time between failures not less than 5,000 hours

Automatic compensation function: VI has self-calibration and automatic zero functions