Tunnel visibility detector

1.Tunnel visibility detector product introduction

Tunnel visibility detector works according to the transmission principle. The transmitter/receiver and reflector are installed relative to each other. After being fixed and aligned by the bracket, the highly focused light beam emitted by the optical component becomes a detection beam. The installation distance is 3 meters (round-trip double optical path, the actual detection optical path is 6 meters). Due to the attenuation of dust, the receiver receives the signal and processes it into a measurement value. According to the requirements of my country's "Highway Tunnel Ventilation and Lighting Design Specifications", it is installed on the top or side wall of the tunnel.

The intelligent detector has a built-in compensation function. When the optical lens is contaminated, it can automatically perform gain compensation, thus ensuring a longer maintenance cycle. Tunnels are special tubular structures. Due to their small space and airtightness, the exhaust gas emitted by vehicles passing through tunnels, if not discharged in a timely and reasonable manner, will cause the accumulation of CO and suspended particulate matter, which will directly affect the personal safety of vehicle drivers and maintenance personnel passing through tunnels.

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

2. Tunnel visibility detector product features

1. Can measure visibility (VI) and carbon monoxide (CO) simultaneously or separately;

2. High-resolution visibility measurement;

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

4. Specially designed for harsh tunnel environment;

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

6. Low installation, startup and maintenance costs;

7. The instrument has built-in status display, fault alarm and data storage functions, which is convenient for debugging and equipment maintenance;

8. Multiple output modes, convenient data collection;

9. Unique compensation function ensures a longer maintenance cycle;

10. Non-contact, continuous monitoring of visibility;

11. Using the latest microprocessor technology, fully digital operation.

3. Technical parameters of tunnel visibility detector

Installation method: wall mount

Power supply: AC220V

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

Measuring principle: Ray casting 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: MTBF is no less than 5,000 hours

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