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6.6 Automatic clean air test
Automatic clean air test is activated by checking “Auto Clean Air” option on
Operation/General screen. It is run weekly/monthly on specified time.
Test runs for 20 minutes at 5 lpm and 1 s time resolution. Data is marked with status 2048.
Test results are displayed in the log file: average BC concentrations and point-to-point
variations are calculated for each channel and spot. After the test a report is generated (see
chapter 6.5 Manual clean air test).
6.7 Tape sensor calibration
Tape sensor calibration is conducted when removing the Measurement chamber from/to the
Aethalometer. For calibration you need special calibration cylinders covered with the
filter tape with the backing on the outside. Small cylinder has diameter of 39 mm; big cylinder
has diameter of 102 mm.
For tape sensor calibration you have to stop the measurement and select “TapeSenAdj” button
on the Operation/Advanced tab. Then follow the instructions on the screen. It is essential to fix
calibration cylinders with the covers during calibration.
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