Indoor Air Quality Monitoring of Carbon Dioxide (CO2) using CO2 Sensor
Carbon Dioxide (CO2) Monitoring using CO2 sensor
Following article lists sources of carbon dioxide which cause indoor air pollution, why measurement of indoor carbon dioxide is necessary, harmful effects of carbon dioxide on human health and how indoor carbon dioxide is measured using CO2 sensor.
Carbon dioxide is a colourless, odourless and tasteless gas. It is produced in indoor environment by either combustion of organic matter or by respiration processes of living aerobic organisms. In office buildings human respiration is biggest source of carbon dioxide. In big corporate areas, there is immense number of occupants who breathe out CO2 in large amounts. This can be detected by using CO2 sensor. Outside air also carries CO2 in different quantities as the season varies. It comes inside via AHUs, which circulates the outside air in. The contaminants also come along with the same air, which harmfully affects the occupants inside.
Generally, high levels of carbon dioxide indicate high levels of other indoor air pollutants. Carbon Dioxide levels measured using properly calibrated CO2 sensor are also used to estimate the ventilation rate of the system. American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 62-2001 recommends a reading of 700 ppm in CO2 sensor above the outdoor concentration as the upper limit for occupied room (usually around 1,100 ppm in CO2 sensor). This recommendation is to prevent body odour levels from being offensive.
When it comes to Indoor Air Quality, CO2 is known as “canary in the mineshaft”. High levels of CO2 means more VOCs and more microorganisms which can be detected by using CO2 sensor. In addition to quality of air, CO2 can be very harmful and affect the health of the occupants severely. A general survey has brought to notice that CO2 can lower down the concentrations in performing any tasks. This can result in lower productivity among employees. Therefore, use of gas sensors like CO2 sensor is suggested for offices.
Carbon Dioxide can cause drowsiness with prolonged exposure. It is mildly narcotic and causes increased blood pressure and pulse rate. It also causes reduced hearing. It stimulates the respiratory centre causing dizziness, confusion, difficulty in breathing, sweating, dim vision, tremor and loss of consciousness after exposure for between five to ten minutes.
Carbon dioxide is measured using CO2 meter which has inbuilt gas sensor i.e. CO2 sensor. It gives an instant feedback with CO2 levels, additional temperature and humidity measurement. Its built-in alarm warns against dangerous CO2 levels as and when detected by CO2 sensor. The portable CO2 Meter with properly calibrated CO2 sensor is designed to measure air quality compliance in occupied spaces such as offices, production floors, schools or hospitals.
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