Nitrogen dioxide monitor is a toxic, corrosive and oxidizing gas emitted in large quantities as a result of combustion of fossil fuels (road traffic, power plant emissions). It contributes to air pollution, deterioration of the atmosphere and acid rain phenomenon.

A nitrogen dioxide monitor is used to detect the harmful gas in ambient air and trigger an alarm if the concentration level becomes dangerous. The monitoring equipment is a good investment for industries dealing with nitrogen dioxide.

For example, gas detectors for nitrogen dioxide are used in bus- and truck garages, underground parking houses, tunnels, engine repair shops, etc. These devices allow to monitor the levels of harmful gases in a workplace and ensure that ventilation is done according to required quantity. When the concentration of nitrogen dioxide reaches an unhealthy level, the built-in sensor triggers an alarm and the fan automatically starts. The alarm stops when the concentration of the harmful gas decreases.

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Nitrogen Dioxide (NO2) monitors are equipped with an electrochemical NO2 sensor which responds to the presence of this toxic gas. Upon contact with nitrogen oxide, the sensor produces an electric current in nA proportional to the concentration of NO2 present.

The density of nitrogen dioxide is greater than that of air, meaning that it rises higher in a room than oxygen, which is why nitrogen dioxide sensors are mounted closer to the floor. For environments that house vehicles with top-exiting exhaust stacks, it is recommended to mount the NO2 sensors close to normal breathing height, in order to be able to monitor the concentration of this gas more rapidly.