SMKB – COVIE Tunnel Visibility & Gas
Sensor
Tunnel is a special kind of tubular structures, due to the small space. Particles
and hazardous
Gas generated by cars will directly affect visibility
in tunnel and endanger passengers and maintenance staff personal
safety if they are not ventilated out in time. The SMKB-COVIE is designed to
collect real- time monitoring data of VI and carbon monoxide in-situ, and pass
those information to traffic supervision departments, so as to provide
decision-making basis for tunnel ventilation and road safety.
Working Principle
SMKB-COVIE is a visibility detector of transmission principle based, both
emitter/receiver and the reflector are installed and fixed alignment using
bracket, highly focused optical beam is emitted by emitter then go through 3
meter optical path and reflected by reflector. The actual travel distance of
optical beam is double optical path as 6 meters, the attenuation caused by dust
is processed as the measured value. According to the requirements of tunnel
construction, the visibility detector should be installed on the top or side
wall of the tunnel. SMKB-COVIE visibility detector has its own compensation
function. It can automatically self-compensated when the optical lens is
contaminated, therefore, it has longer maintenance period.
Application
- High resolution visibility measurement
- The measurement is completely free from the influence of other stray light
sources
- Specially designed for harsh environment of tunnel.
- Measurement is totally free from vibration caused b environment and moving
vehicles.
- Installation, running, maintenance is low cost
- Multiple output mode, easy for data collection
- Unique compensation function allows a longer maintenance cycle
- Non-contact, continuous visibility measurement.
- Using the latest microprocessor technology, fully digitized.
Technical Parameters
| Items |
Visibility |
CO(optional) |
NO(optional) |
NO2(optional) |
| Working Principle |
LED Transmitivity |
Electrochemical Cell |
| Unit |
m-1 |
ppm |
ppm |
ppm |
| Measure range |
0–35×10-3 m-1 |
0–500ppm |
0–30ppm |
0–10ppm |
| Optical path |
6 meters optical length(installation length is 3meters) |
- |
- |
- |
| Accuracy |
±0.002 m-1 |
±2 ppm or 2% span |
±2 ppm or 2% span |
100ppb |
| Digital output |
RS485 |
| Compensation |
VI has self-calibration and automatic compensation function |
| Analog output |
two ways 0/4mA- 20mA(internal resistance<500Ω) |
| Operational Temp. |
-55－65 |
| Ambient humidity |
0－100%RH(non-condensing) |
| Power supply |
220V±15%VAC 50HZ |
| Power consumption |
Rated 5W, Maximum 10W |
| IP Grade |
IP65 |
| Weight |
18 kg |
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