The CODEL TunnelTech 404 NO2 and Visibility Air Quality Monitor is a compact extractive analyser configured for the continuous measurement of two key parameters in road tunnels. This extremely stable and reliable monitor incorporates an LED to utilise the capacity of Nitrogen Dioxide to absorb UV and blue light to provide accurate readings in parts per billion.
It also uses the same sampling system to monitor Visibility using a unique double sensor design. NO2 and particulate are produced naturally by the combustion processes within the internal combustion engine and are emitted from the exhausts of all types of vehicles.
Key Features
- Continuous measurement of NO2, NO and Visibility in road tunnels
- Three analogue and relay outputs
- Extractive analyser for easy maintenance and calibration
- Minimal maintenance requirements, low cost of ownership
- Panel mount PC for commissioning, control and diagnostics
- RS485 (MODBUS) and Ethernet output
SpecificationImagesDocumentationProduct Enquiry
Feature |
Specification |
| Measurements | NO2 and Visibility |
| Measuring units | NO2 ppm / Visibility K factor(M-1) or metres |
| Measurement Range | NO2 0 – 1ppm standard, configurable up to 0 – 5ppm / Visibility 0 – 0.015m-1 |
| Ambient Temperature | -20°C to +50°C |
| Power supply | 12V DC @1.5A |
| Construction | Corrosion resistant epoxy coated aluminium housing sealed to IP65 |
| Analogue outputs | 4 x 4-20mA, 200V common mode isolation, max. load 500Ω |
| Relay Outputs | 4 x volt-free contacts SPCO, 0.25A @ 125V AC, 1A @30V DC, 0.25A @ 100V DC |
| Communication Ports | RS 485 MODBUS, Ethernet RJ45, USB |
| Lang | Filetype | Document | Size |
 |
 |
TunnelTech 404 Datasheet | 400kb |
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