Tunnel Visibility Detector SDN1: Protecting Tunnels from Harmful Gas Accumulation

Poor ventilation and dense traffic flow in the tunnel can easily lead to the accumulation of harmful gases, posing a threat to safety. The Tunnel visibility detector by Fengtu uses the transmission principle to accurately monitor visibility and CO concentration, safeguarding tunnel safety.

Product Introduction

The SDN1 detector is based on the transmission principle. The transmitter/receiver and the reflector are installed opposite each other and fixed, forming a highly focused light beam. The installation distance is 3 meters, and the actual detection optical path is 6 meters. The signal attenuated by dust is processed into a measured value, and it is installed on the top or side wall of the tunnel according to the specifications. It has a built-in compensation function. When the optical lens is contaminated, it automatically performs gain compensation, extending the maintenance cycle. Due to the airtightness of the tunnel, vehicle exhaust gases are likely to accumulate, endangering the safety of personnel. The SDN1 series collects VI/CO data online, providing a basis for traffic supervision and ventilation decision-making.

Product Features

The SDN1 detector has multiple advantages: It can measure visibility and carbon monoxide simultaneously or separately; it has a high visibility measurement resolution; it is not affected by stray light sources; it is specifically designed for the harsh environment of the tunnel; it effectively avoids the influence of environmental and vehicle vibrations; it has a low installation and maintenance cost; it has a built-in status display, fault alarm, and data storage functions; it supports various output methods, making data collection convenient; its unique compensation function extends the maintenance cycle; it performs non-contact continuous monitoring; it uses the latest microprocessor technology to achieve fully digital operation.

Technical Parameters

Installation method: Wall-mounted installation, easy to operate.

Power supply method: AC220V, with strong compatibility.

Measured values: The unit of VI value is 1/m, and the unit of CO concentration is PPM, with intuitive data.

Measurement principle: Light projection method, scientific and reliable.

Measurement range: VI is 0--15×10-3 1/m, and CO is 0--400PPM, with a wide coverage.

Measurement distance: 6-meter optical path, with a 3-meter probe spacing, reasonably designed.

Precision: VI ±0.0001 1/m, CO ±1PPM, with high precision.

Output interval: 60 seconds, updated in real time.

Digital output: RS485, a common interface.

Analog signal output: Two channels of 0/4mA-20mA, with an internal impedance ≤500Ω, for stable transmission.

Reliability: The average time between failures is ≥5000 hours, stable and durable.

In conclusion, the Tunnel visibility detector by Fengtu provides accurate monitoring, intelligent linkage, convenient installation, and stable performance. It comprehensively solves the problems of tunnel environment management, ensures the safety of vehicles and pedestrians, and is one of the commonly used instruments for the safety management of modern traffic tunnels.