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The BlueSky™ Air Quality Monitor is calibrated to the same exacting standards as the DustTrak™ monitor. When positioned in outdoor ambient air, the DustTrak monitor and the BlueSky monitor measurements track each other well.
The calibration lifespan depends on usage and ambient concentration. TSI recommends replacing the PM sensor inside the BlueSky Air Quality Monitor once a year, although the sensor can easily last longer under most normal ambient conditions typically found in the US and Europe. Also, your BlueSky monitor comes with onboard diagnostics, which will help you to identify if and when you need to replace the sensor. Refer to Chapter 5 of the BlueSky monitor manual for detailed error code descriptions.
The PM sensor cannot be calibrated by the user. However, the BlueSky Air Quality Monitor accommodates a user calibration factor on TSI Link Solutions. The user can program a custom calibration factor if their BlueSky monitor is reading differently from a reference monitor. This will keep your data accurate.
BlueSky monitors are calibrated for aerosol to within 10% of DustTrak monitors. The accuracy of the BlueSky monitor can be vastly improved by co-locating it with a reference monitor, if available. This is optional and up to the user.
As is common among many air quality sensors, accuracy is affected by the type of aerosol, the size distribution of the aerosol being sampled, and the density and refractive index of the aerosol. Humidity can also affect the accuracy of the measurement.
No, the TSI factory calibration cannot be changed by the user.