Tunnel visibility, COVI, nitrogen dioxide detector

　　Tunnel visibility, COVI, nitrogen dioxide detectorConsidering the particularity of tunnel environment, it is specifically designed for harsh tunnel environments. Functionally, it can be flexibly operated to measure visibility, carbon monoxide, and nitrogen dioxide simultaneously, as well as perform individual measurements separately, meeting diverse monitoring needs. In terms of visibility measurement, it has high resolution and can accurately capture subtle changes in visibility. Moreover, the measurement process is not affected by other stray light sources, ensuring the accuracy and reliability of the data.

　　Tunnel visibility, COVI, nitrogen dioxide detectorProduct Introduction

The SDN2 detector works based on the principle of transmission, with the transmitter/receiver and reflector installed relative to each other. After being fixed and aligned with a bracket, the highly focused beam emitted by the optical components becomes a detection beam. The installation distance is 3 meters apart (with a round-trip dual optical path and an actual detection path length of 6 meters). Due to the attenuation of dust, the receiver obtains signals and processes them into measurement values. According to the requirements of China's "Design Code for Ventilation and Lighting of Highway Tunnels", it should be installed on the top or side walls of the tunnel.

The intelligent detector has a built-in compensation function, which can automatically perform gain compensation when the optical lens is contaminated, ensuring a longer maintenance cycle. Tunnels are a special type of tubular structure that, due to their small space and enclosed nature, can cause the accumulation of CO and suspended particulate matter, as well as toxic gases such as nitrogen oxides (NOX), if the exhaust gases emitted by vehicles passing through the tunnel are not discharged in a timely and reasonable manner. This will directly affect the personal safety of the drivers, passengers, and maintenance personnel of vehicles passing through the tunnel.

The SDN2 series is designed to collect VI/CO/NO2 data online and provide it to traffic supervision departments, providing decision-making basis for tunnel ventilation and road safety.

Product Features

1. It can simultaneously or separately measure visibility (VI), carbon monoxide (CO), and nitrogen dioxide (NO2);

2. High resolution visibility measurement;

3. The measurement is not affected by other stray light sources;

4. Specially designed for harsh tunnel environments;

5. Effectively avoid the inability to measure caused by environmental and passing vehicle vibrations;

6. Low installation, startup, and maintenance costs;

7. The instrument comes with status display, fault alarm, and data storage functions, making it easy to debug and maintain the equipment;

8. Multiple output modes, convenient data collection;

9. The compensation function ensures a longer maintenance cycle;

10. Non contact and continuous monitoring of visibility;

11. Equipped with the latest microprocessor technology and running digitally

Technical Specifications

Installation method: Wall mounted installation

Power supply mode: AC 90-305V

Measurement value: VI value: 1/m,

CO concentration: PPM

NO2 concentration: PPM

Measurement principle: ray projection method

Measurement range: V I: 0-35 × 10-31/m,

CO：0--1000PPM

NO2：0--20PPM

Measurement distance: 6-meter optical path (probe installation distance of 3 meters)

Accuracy: V I: ± 0.0001 1/m,

CO：±1PPM

NO2：±0.5PPM

Output interval: 10 seconds

Digital output: RS485

Analog signal output: 3-channel 0/4mA-20mA (internal impedance not exceeding 500 Ω)

Data update rate: 6/min

Reliability: The average time to failure is not less than 5000 hours

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

Power consumption:<15W

Environmental temperature: -40~+75 ℃

Air humidity: 0~100% RH