Product Details

1.Product

Tunnel CO/VI detectors are designed to effectively monitor tunnel visibility and CO concentration around the clock so that fans can be started in a timely manner for forced ventilation and other corresponding measures to provide decision-making basis for tunnel ventilation and safe road traffic.

2.Options

1) Free software platform for data management.

2) Provide multiple communication options. Supports standard RS485/4~20mA communication and is compatible with standard MODBUS communication protocol.

3) The nitrogen oxide detection function can be expanded according to specific needs.

3.Technical Specifications

Environment Conditions

Operating temperature	-40～+75℃
Operating humidity	0～100%RH
Installation method	Wall-mounted for installation on tunnel side walls

Performance

Interface output	RS485 / 4～20mA
Protocol	modbus
powered by	DC12V / AC220V
Power consumption	＜10W
Output interval	60s
Data Update	1item/min
Light source	940nm
wavelength	Mean time between failures is no less than 15,000 hours

Measurement performance

Product Features	Visibility(VI)	Carbon monoxide(CO)
Units of measurement	1//m	ppm
Measuring range	(0～35x10-3)1/m	0～400ppm
Measurement accuracy	(±0.0001) 1/m	±1ppm
Measurement methods	Raycasting
Measure distance	6-meter optical path (probe installation distance 3 meters)

4.Performance

The tunnel COVI 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 apart (double optical path to and from, actual detection The optical path is 6 meters). After the attenuation of the optical signal by the atmospheric channel, the signal obtained by the receiver is processed by the processor and becomes the measurement value.

The intelligent detector has a built-in compensation function. When the optical lens is contaminated, it can automatically perform gain compensation, thereby ensuring a long maintenance cycle.

5.Feature

1) The detector has a built-in compensation function, which can automatically perform gain compensation when the optical lens is contaminated, thereby ensuring a longer maintenance cycle.

2) Visibility (VI) and carbon dioxide (CO) can be measured simultaneously or separately.

3) High-resolution visibility measurement, the measurement is completely unaffected by other stray light sources.

4) Rugged appearance, designed for the harsh environment of tunnels, effectively preventing environmental or vibration factors from being impossible to measure.

5) The instrument comes with status display, fault alarm and data storage functions to facilitate debugging and equipment maintenance.

6) Using microprocessor technology, it operates completely digitally.

6.Certification