According to the Hardware Requirements of Continuous Monitoring Protocols for WELL, as stated in the Well Performance Verification Guidebook (Q1-Q2 2024 edition, pages 36-37)
Continuous Air Quality Monitor, Atmocube, is equipped with PM2.5, TVOC, CO2, temperature, and humidity sensors. Atmocube has RESET Grade B and Works with WELL certification. The PM2.5, TVOC, and CO2 sensors feature Automatic Background Calibration (ABC) algorithms by Sensirion. According to the manufacturer's specifications, the sensors' lifespan is 10 years. Sensor datasheets are available on our website as well: Sensor Accuracy and Technical Specifications
Based on the above, our CO2, temperature, and humidity sensors should only need calibration or replacement every 3 years. Meanwhile, our TVOC and PM2.5 sensors, even with ABC algorithms, should be calibrated or replaced annually.
Regarding the annual procedure for TVOC and PM2.5 compliance, we would like to offer a cost-effective solution for our WELL project clients.
Once a year, the building technician will remove the Atmocubes from the wall and ship them to our local accredited partner (U.S., U.K., E.U. (Portugal)). The accredited partner disassembles Atmocube according to the manual, tests the internal sensors, replaces PM2.5 and TVOC sensors as necessary, and ships them back, providing a digital certificate for the service. This entire process occurs within a month, in compliance with the IWBI Performance Verification Guidebook.
As a backup option for large projects, our technician may visit the WELL certified building to collect the sensor and conduct the procedure.