CAIRPOL - Cairsens© Miniature Air Quality Monitoring Sensors Network
Our Cairsens© sensor is an integrated system consisting of a compact measuring cell (amperometric, but also NDIR, PID...), a dynamic air sampler with a patented filter, and an electronic circuit allowing measurement of the smallest variations in concentration levels.
Using a gas specific inlet filter combined with our dynamic air sampling system technology, a reliable measurement is achieved by limiting the effect of humidity variations. The high quality of our Cairsens© allows specific measurement, comparable to the reference methods (notably by the USEPA, the JRC, etc.).
The compact size of the Cairsens© along with its very low power consumption allows them to be easily positioned and set up outside for several days (Cairtub©), or integrated with our autonomous and wireless communicating stations for real-time data access (Cairnet©).
View the "Main Options" tab to learn more about our Cairtub©, Cairnet©, and Caircloud software products.
Monitoring fugitive emissions like odor on WWT plants
Dynamic pollution mapping
Ambient air pollution study
Indoor air quality measurement
Chronic exposure evaluation
Individual health survey
Simple, reliable, cost effective
Ppb levels detection
No maintenance required, no need for re-calibration
Autonomous version (solar panel)
Useful life: 1 year
LCD display with concentration levels of the measured pollutants
Internal data logging capacity: up to 1 year, depending on the setting
Internal microprocessor for value and time calculation
Low battery indication
Operating time: 24 to 36 hours when fully charged for USB versions (daily recharge for optimal use)
Power supply: 5VDC /200 mA rechargeable by USB via PC or 220V/110V with 5V adaptor (solar panel option)
Output: USB or UART (Analog signal on demand)
Dimensions: diameter 32 mm (1.26’’), length 62 mm (2.44’’)
Weight: 55 g (1.94 oz)
IP 42 (according IEC60529)
Storage condition: 5 to 20°C (41°F to 68°F), 10 to 90% RH, mbar 1013 ± 200 (psi 14.69 ± 2.90)
Operating condition: depending of the sensor, in general -20°C to +45 °C (-4°F to 113°F), 10 to 90% RH, mbar 1013 ± 200 (psi 14.69 ± 2.90)
Electric standards: CEI/UL/CSA N°61010-1: 2008 / EN 61010-1:2001
* Detailed specification per sensor on request
Available Cairsens© Miniature Air Quality Monitoring Sensors and Ranges
Pollutants are abundant and air quality monitoring as we know it (regulated by the authorities) is typically based on the main pollutants which can affect health or the environment. The pollutants of interest are representative of releases from the primary sources of pollution such as traffic and industry, or for indoor air quality because of the release of vapors and odors from building materials. Our Cairsens© sensors can measure and monitor most of these pollutants.
Altech has a Cairsens© sensor to measure the pollutants present in urban areas or industrial areas (H2S, CH4S, O3, NO2, nmVOC, CO, NH3, etc.).
Initially designed for oxidizing (O3 / NO2) monitoring to warn asthmatics of real-time pollution levels, Cairpol sensor ranges has been developed further to cover industrial applications including the measurement of sulfur compounds and H2S (typical odorous nuisances from waste water treatment plants and paper manufacturing facilities) and ammonia (characteristic odor from decomposition processes), but also CO, SO2, non-methane VOCs (nmVOC), etc.
In 2005, the World Health Organization (WHO) set guidelines for pm2.5 and pm10 particulate matter and for the following gases: ozone, nitrogen dioxide and sulfur dioxide. Many countries including the United States of America are required to measure additional parameters. For example, in the United States of America, the Clean Air Act requires EPA (Environmental Protection Agency) to set National Ambient Air Quality Standards for six common air pollutants. They are particle pollution (often referred to as particulate matter), ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. EPA calls these pollutants "criteria" air pollutants because it regulates them by developing human health-based and/or environmentally-based criteria (science-based guidelines) for setting permissible levels.
O3/NO2 – Ozone and nitrogen dioxide
From the oxidizing gas family, ozone and nitrogen dioxide are the most common pollutants in cities and their surroundings. They will impact the human health by irritating the bronchia and the eyes.
Ozone is considered a secondary pollutant, consequent to the transformation of oxygen from the solar UV on contact with nitrogen dioxide (NO2) and hydrocarbons (HC). Hence it generally appears at a certain distance from emissions areas of those pollutants (NO2 and HC), as the transformation requires some time.
Nitrogen dioxide is linked to traffic and from urban heating. Another source is the oxidation of the nitrogen monoxide emitted by the ozone itself.
Both being closely linked, we measure these two pollutants through one sensor and we display only one unique value for both of them (no difference made between the two).
NO2 – Nitrogen dioxide
As detailed above, nitrogen dioxide is mainly caused by traffic and urban heating (20%), it can be beneficial to measure only this gas in order to monitor the impact of those activities directly.
CO – Carbon monoxide
This gas is also coming from the incomplete combustion of various combustibles (gas, fuel, coal, wood), and notably the traffic for example. It is also measured in industrial sites monitoring involving combustion in their process.
CO2 – Carbon dioxide
Naturally present in the atmosphere at around 390ppm, it is today the main indicator in indoor air quality. Indeed, a poor aeration in an inhabited building (and thus the lack of air renewal) will increase the CO2 concentration as it is what we exhale.
H2S/CH4S – Hydrogen sulfide and methylmercaptan (methanethiol)
Hydrogen sulfide (H2S) and methylmercaptan (CH4S) are both from the family of the total reduced sulfur compounds. They are easily recognizable by their strong odor (rotten egg for H2S, rotten cabbage for CH4S) which will be detectable at very low concentrations by the human nose.
They are mostly produced by industrial activities: extraction and treatment of gas/fuel, wastewater treatment plants, tanneries, paper mills, etc.
NH3 – Ammonia
Composed of nitrogen and hydrogen, this gas has a pungent odor, and can be irritating when its concentration in the air increases.
It is widely used (one of the most synthesized solvents in the world) in industry, as a refrigerant gas, to synthesize medicaments or also fertilizers. It is also one of the odorous gases produced by the decomposition of used water in wastewater treatment plants.
SO2 – Sulphur dioxide
Sulphur dioxide is mostly produced by industrial activities, thermal power stations and by heating.
It is created by the combustion of gas, fuel, coal… and is directly linked to their concentration in sulphur.
nmVOC – Non-methane volatile organic compounds
The family of volatile organic compounds is extremely wide and contains BTEX (Benzene, Toluene, Ethylbenzene, Xylene).
Derived from the evaporation of combustible or exhaust gas, they are also produced by various industrial activities (refineries, wastewater treatment plants, etc.).
Our sensor measures all the non-methane volatile organic compounds.
CH2O / Organic solvents – Formaldehyde and other organic solvents
We find those pollutants essentially in the indoor spaces, as they are emitted by construction-related materials (paint, adhesive, mural coating, ceiling, wood, etc.). They are a key indicator of indoor air quality with CO2.
PM – Particulate matter
Particulate matter is microscopic particulate, as their size is 10 times smaller than the thickness of a human hair for PM10, or the size of a bacterium for PM2.5. The effect particulate matter has on health, both on pulmonary and cardiovascular levels, has been highlighted by the WHO.
The emitting sources for such pollutants are again industrial or linked to the traffic, heating being also a known source.
Cairtub© : Protective housing for stand-alone outdoor application, 21 days power autonomy, easy to install or move
Cairnet© : Protective housing - with wireless communication, autonomous using solar panel - for online data acquisition
Software : Real-time data management and display on a fixed PC (Cairmap suite) or via Internet access (Caircloud), with numerous optional features: Meteo data integration, alarms management, automated reports, modeling software exports, etc.)