Tunnel visibility detector

1.Introduction to Tunnel visibility detector

Tunnel visibility detectors are specially designed and manufactured for tunnels and pipe galleries for use on highways and tunnels where accurate and reliable visibility measurements are required.

The Tunnel visibility detector works according to the principle of transmission.The transmitter/receiver and reflector are installed relative to each other.After fixed alignment with the bracket, the high-focus beam emitted by the optical components becomes a detection beam, with an installation distance of 3 meters (round and trip dual optical paths, the actual detection path is 6 meters).Due to the attenuation of dust, the receiver obtains the signal and processes it as a measurement value.According to the requirements of my country's "Ventilation and Lighting Design Code for Highway Tunnels", it is installed on the top or side wall of the tunnel.

The intelligent detector has its own compensation function, which can automatically compensate for gain when the optical lens is contaminated, thus ensuring a long maintenance cycle.The tunnel is a special tubular structure.Due to the small space and the characteristics of airtightness, if the exhaust gas emitted by vehicles passing through the tunnel is not discharged in time and reasonably, resulting in the accumulation of CO and suspended particles, which will directly affect the personal safety of the drivers and passengers of vehicles passing through the tunnel and maintenance staff.

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

2.High resolution visibility measurement;

3.The measurement is completely free from other stray light sources;

4.Designed specifically for harsh tunnel environments;

5.Effectively avoid inability to measure caused by vibrations in 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 are convenient for debugging and equipment maintenance;

8.Various output methods, easy data collection;

9.The unique compensation function ensures a long maintenance cycle;

10.Non-contact, continuous monitoring of visibility;

11.Use the latest microprocessor technology to operate completely digitally.

3.Tunnel visibility detector technical parameters

Installation method: wall-mounted installation

Power supply method: AC220V

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

Measurement principle: ray projection method

Measurement 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: 0/4mA-20mA two channels (internal impedance is not large

at 500Ω)

Reliability: The average failure-free time is no less than 5000 hours

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