Target Pollutants
Formula | Name | Sensor Technology | Cartridge Type |
NO₂ | Nitrogen Dioxide | Electrochemical | Standard |
NO | Nitric Oxide | Electrochemical | Standard |
O₃ | Ozone | Electrochemical | Standard |
PM₁ | Particulate Matter | Optical particle counter (OPC) | Standard |
PM₂.₅ | Particulate Matter | Optical particle counter (OPC) | Standard |
PM₁₀ | Particulate Matter | Optical particle counter (OPC) | Standard |
SO₂ | Sulfur Dioxide | Electrochemical | Enhanced |
CO | Carbon Monoxide | Electrochemical | Enhanced |
H₂S | Hydrogen Sulfide | Electrochemical | Enhanced |
CO₂ | Carbon Dioxide | Non-dispersive infrared sensor (NDIR) | Enhanced++ |
TVOC | Total Volatile Organic Compounds | Photo-ionisation detector | Enhanced++ |
Gases
Electrochemical Sensors (EC) are used in the Zephyr sensor for NO₂, O₃, NO, CO, SO₂. and H₂S. The analogue response that is converted to a digital signal is affected by the concentration of the gas of interest as well as other interfering gases (the specific gases and the severity is unique for each EC) and environmental conditions. The retrieved concentration has these effects accounted for, which is validated by both long-term studies and a sensor validation period prior to delivery to the client.
Particulates
Zephyr utilises an Optical Particle Sensor (OPC) to measure particulate matter. The OPC effectively counts and sizes individual particles as they pass through the sensing element. Particle counts are aggregated into corresponding particle fractions (PM₁, PM₂.₅ & PM₁₀) and a density applied to calculate the concentration value. A hygroscopy factor is applied to minimise the impact of cross-interference from humidity and water vapour.