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5. Best Practices
5.1. Filter replacement
The filter should be changed when the optical attenuation (ATN) exceeds
80: a commonly accepted ATN threshold for aerosol photometry at 880
nm. Given this optical attenuation limit, the filter’s operational life before
requiring replacement depends only on the average BC concentration and
flow rate of air sampled through the sensor. For an average BC
concentration of 1 µg/m
3
, Table 1 shows that the effective filter life ranges
from 20.4 to 3.4 days as the sample flow rate settings increases from 25
to 150 ccm. Filter life is inversely proportional to both average BC and
flow rate, and may be calculated using the equation below. The equation
approximates the total sampling time required for the aerosol filter to
reach an ATN of 80 for the given input conditions.
FL = Filter life (days)
BC
avg
= Average BC concentration (µg/m
3
)
FR = Flow rate (ccm)
5.2. Leak check
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