Calibration requirements and procedures depend on the specific sensors fitted within the air quality monitor.
Most sensors, including temperature, relative humidity, barometric pressure, and VOCs, are semiconductor-based and are factory calibrated. These sensors typically have a service life of 5 to 7 years and do not require further calibration during normal use.
The particulate matter (PM) sensor is also factory calibrated and typically has a service life of 5 to 8 years. Under normal operating conditions, it does not require further calibration.
Gas sensors, such as those used for carbon monoxide (CO) and nitrogen dioxide (NO₂), are electrochemical devices. These sensors typically require recalibration every 2 to 3 years, although service life will vary depending on the gases measured and the concentrations to which the sensor is exposed. These electrochemical sensors are designed as plug-in modules and can be replaced easily by the user.
The CO₂ sensors used in our units incorporate Automatic Background Calibration (ABC) and typically do not require manual recalibration for 8 to 10 years, provided the unit is exposed to fresh air for at least 1 hour within every 8-day period. Where this condition cannot be met, the ABC function can be disabled and the unit should then be recalibrated manually every 1 to 2 years.
