Senseair森尔ABC算法
由于内置自校正ABC算法，所有Senseair传感器在正常环境下均免维护。ABC代表自动基线校正（Automatic Baseline Correction），这Senseair森尔研发的自校准功能，用于实现气体传感器的免维护。这意味着，我们的传感器的预期寿命至少为15年，并且在正常室内空气应用中使用时，无需进一步校准。
ABC算法是如何工作的？
ABC算法在预先配置的时间间隔内不断跟踪传感器的最低读数，当检测到与预期的新鲜空气中CO2 水平数值400 ppm（或0.04%vol）有任何长期偏移时缓慢进行矫正。 在正常的室内应用环境中，空气中二氧化碳水平在一周的某个时间点会下降到接近室外空气的水平。通过在8天内对数值进行采样，然后将最低值与仪表400点进行比较，仪表可以了解是否需要将传感器调整零点。
如果传感器需要检测碳氢化合物，这些气体的含量在大多数情况下可能接近0 ppm。在所有情况下，ABC算法的设定值都是可调的。该算法利用了无人居住时建筑物中的二氧化碳标高会稳定这一事实研发而成。
What causes sensor drift?
Rough handling, transportation, and ageing might result in a reduction of sensor accuracy. With time, the ABC-function will tune the readings back to the correct numbers.
What if a room is occupied 24 hours per day?
If a space is constantly occupied and there are no periods when outside levels drop to background levels, the ABC-algorithm will not work. This is the case for greenhouses or in closed confined spaces where CO₂ levels may always be elevated. For these applications, the ABC-function can be turned off. Without the ABC operating, the sensor should be calibrated every two to three years.
What if outside/background levels are higher or lower than 400 ppm?
Sometimes, the lowest level may be higher or lower than the 400 ppm assumed by the self-calibration algorithm. CO₂ based ventilation control is based on measuring the difference between inside and outside concentrations. It really does not matter if the lowest level of the concentration is 450 ppm; just knowing the difference between the baseline period and the occupied period is enough to provide adequate ventilation control. This algorithm has the same effect as placing a sensor outside to constantly measure the difference between inside and outside CO₂ concentrations.
How long will the sensor maintain calibration?
The sensor will maintain calibration as long as it periodically senses a background level of CO₂. The electronics and components in the sensor are rated for a minimum 15-year life. The sensor should maintain calibration over its working life.
Important factor when you compare sensors
You might find sensors that cost half as much as ours, but make sure to consider the cost of lifespan and maintenance!