Tunnel visibility detector

1. Product introduction of tunnel visibility detector

The tunnel visibility detector is also called the tunnel visibility meter. The tunnel visibility detector is a new generation of meteorological visibility monitoring equipment developed after the transmission visibility meter. It can measure visibility (VI) and carbon monoxide (CO) simultaneously or separately to ensure the safety of traveling through the tunnel. The personal safety of vehicle drivers and maintenance staff. The FT-SDN1 detector works according to the transmission principle. The transmitter/receiver and reflector are installed relative to each other. After being fixed and aligned using a 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 The detection optical path is 6 meters). Due to the attenuation of dust, the receiver obtains the signal and 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.

The FT-SDN1 series 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

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

Measuring range: VI: 0--35×10-3 1/m, CO: 0--500PPM

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

Accuracy: VI: ±0.0001 1/m, CO: ±1

Digital output: RS485

Analog signal output: two channels 0/4mA-20mA (internal impedance not greater than 500Ω)

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