Automatic Clean Air Test - MAGEE Scientific Aethalometer AE33 User Manual

Aethalometer
Model AE33
The average BC values should be close to zero (less than +/- 100) if the Aethalometer is
warmed up and stabilized for at least one hour. Occasionally, a short transient may be seen at
first, due to a filter compression artifact.

9.7 Automatic Clean Air Test

The Automatic Clean Air Test is activated by checking "Auto Clean Air" option on the
Operation/General screen. It can run on a weekly or monthly schedule at a specified time.
The test duration is 20 minutes and it is run at a flow rate of 5 LPM, 1 second time base.
During the test, the Status Flag is set to 2048. The test results are displayed in the log file:
average BC concentrations and point-to-point variations are calculated for each channel and
each spot.
After the test, a report is generated (see section 9.6 Clean air test). If the test result is not
acceptable, a warning status code value of 16384 is generated.
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User's manual – Ver. 1.55 July 2017 78/146