Autonomous networks of sensor-based mini-stations


Cairnet® device is a real-time standalone and networkable air-monitoring station containing up to 6 Cairsens® microsensors and cellular communication within a waterproof enclosure.

Thanks to its integrated manifold allowing a dynamic sampling, the measures are accurate and reliable. Electronic compounds are sealed & protected from moisture and corrosive ambient air.
Compact, easily deployable and autonomous thanks to its solar panels and battery, Cairnet® enables you to cost-effectively monitor dust and gas and gives a complete picture of the environmental impact of your operations.
It offers unprecedented flexibility in producing accurate and dynamic air quality measurements across a broad range of industries and applications.

“40 years of experience in the field of environmental monitoring to the benefit of our micro-sensors”
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  • Real time continuous measurement and monitoring of up to 6 gaseous and particulate pollutants simultaneously, among: H2S/CH4S, NH3, nmVOC, O3+NO2, NO2, CO, SO2, PM, plus environmental parameters: temperature, relative humidity and pressure.
  • Plug & Play Network: no manual intervention, automatic detection, linking and configuration of the network (Cairsens® / Cairnet® / Caircloud®)
  • Very high sensitivity to capture low level gas concentrations (down to ppb)
  • Modular, easy to use, easy to move: no cables or complicated installation, just set up and move to different locations on your site as needed
  • Cairnet® requires only annual maintenance, when sensors should be renewed with new ones
  • Ability to change the set of pollutants being monitored at any time
  • Advanced remote diagnosis with real tracking state of life
  • Possibility to realize hybrid AQMS networks (reference stations & mini-stations)
  • Operating cost savings: process adjustment & Improvement of local communication (neighbors & authorities)
  • Cost-effective solution for air quality monitoring
Independent reviewers, including the European JRC (Joint Research Council) and the US-EPA, have determined the accuracy, linearity, limits of detection and precision of Cairsens® as very good when compared with reference devices. Further studies with NASA have shown very good agreement with reference measurements.
  • Odor monitoring: WWTP, recycling, pulp and paper manufacturing, sewerage treatment facilities, refineries
  • Indoor and outdoor air quality monitoring: smart cities, road-side & tunnels, schools, airports, ship terminals…
  • Process leak detection and monitoring of fugitive emissions: quarries, storage facilities, mines, manufacturing plants
  • Forecasting of industrial fence line emissions
  • Environmental impact assessments
  • Health and safety: mines, industrial sites, construction
  • Mapping and modelling pollution sources

Application examples:

    Every Cairnet measurement point consists of:

  • Solar panel and its battery
  • Wireless communication module
  • Weather protection enclosure including up to 6 Cairsens miniature sensors, each measuring one or two pollutants. The sensors are to be selected from the list, function of your specific requirements.
Measurable parameters
Pollutant Range
Certified detection
limit (ppb)*
S / CH4S
1 A40-0401
NH3 0-25,000 500 1 A40-0408
nmVOC 0-16,000
1 A40-0409
O3 + NO2 0-250 20 1 A40-0406
NO2 0-250 20 1 A40-0405
CO 0-20,000 50 1 A40-0404
SO2 0-1,000 50 1 A40-0407
PM10/PM2.5/PM1 0-1,000 µg/m3 <5 µg/m3 0.01 µg/m3 A40-0414
*They are delivered with a calibration certificate.
Technical specifications
Power supply 8 to 30 VDC / 2.5 A or battery + SP
Battery included 3.7V-22Ah, Li-Ion
Solar Panels Kit (option) 27 Watts (with 2 panels). Mounting bracket included
Control & Data Treatment Board Internal microprocessor for data acquisition, power and communication managment etc…
Embedded Real-Time-Clock (auto-adjusted at every communication)
Wireless communication Cellular 3G-, 4G LTE (SIM not included)
Locally data storage Internal Cairsens memory. Data buffering for back up if communication is lost
Mounting included Included for pole, tripod, mast, wall, etc. (⌀50 mm max)
Dimensions of the Cairnet® housing with mounting kit & antenna 300 x 215 x 257 mm (L x H x W)
Dimensions of the solar Panels with its mounting kit 800 x 410 x 100 mm (L x H x W)
Weight of the Cairnet® housing 4 Kg
Weight of the Solar Panels kit 4.9 Kg
Environmental using conditions -20°C to +50°C / HR 10% to 90%

Cellular communication characteristics:

  • Technology and frequency bands: LTE (1800, 2100, 2600 MHz), WCDMA (800,1700, 2100 MHz), GPRS/Edge (850 MHz, 900 MHz, 1800 MHz, 1900 MHz)
  • Download up to 100 Mbps, Upload up to 50 Mbps
  • Regulatory compliance: R&TTE directive 1999/5/EC Japan JRF/JPA – FCC – IC

Site configuration and communication mode:

  • Wireless / Cellular: suitable for large surface network deployments, industrials & urban sites covered by the network.
  • Serial / Modbus: suitable for local spot monitoring for applications such as health and safety, process leakage detection or area not covered by telephone network

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