What is the primary reason for performing Zero Air Calibration in Dust Trak II?

The primary reason for performing Zero Air Calibration in Dust Trak II is to eliminate zero drift out of the electronics. This calibration process is essential for ensuring the accuracy of measurements taken by the device. Over time, the sensors can drift from their true zero point due to environmental factors, contamination, or other variables that may affect the electronics' performance. By performing a zero air calibration, the device is reset to ensure that it measures zero particulate matter accurately when there are no particles present in the air. This step is crucial for maintaining the integrity of the measurements, as it establishes a reliable baseline from which all other readings can be taken. If zero drift is not corrected, it can lead to erroneous data, making it challenging to assess the true levels of particulate matter in the environment.