Zephyr calibration process
We calibrate every Zephyr sensor cartridge prior to dispatch.
Gases measured by our standard cartridges - NO₂, NO, O₃ - are calibrated using our own reference standard analysers.
Particulates - PM₁, PM₂.₅ and PM₁₀ - are given a fixed, laboratory-developed, iMCERTS-approved calibration. Each sensor is validated at our facility against reference equipment, which is maintained in line with national reference standards and ratified by AQDM.
Additional gases measured by our enhanced cartridges - H₂S, SO₂, CO, CO₂ and TVOC - are calibrated by pinning background conditions to the background field in the urban environment of our facility.
Following successful calibration we provide you with a calibration certificate for your Zephyr, which you can find by clicking the three dots on your Zephyr in the MyAir® location tab.
Calibration steps
- Co-located with our MCERTS-equivalent reference station
- Effective offset bias adjustment
- Proprietary scaling algorithm
- Calibration certification
EarthSense’s UK calibration facility
At EarthSense, we call this facility The Cage. Inventive, we know.
Reference analysers
Monitor | Species |
Teledyne T200 | NO₂ and NO |
Teledyne T400 | O₃ |
GRIMM EDM180 | PM₁, PM₂.₅ and PM₁₀ |