Manual Clean Air Test - MAGEE Scientific AE33 User Manual

Aethalometer
Model AE33

6.5 Manual clean air test

Clean air test is conducted using the built-in filter to determine the performance of
Aethalometer under the standard flow condition.
To perform the clean air test, select Operation/General/Clean air test. Test runs for 20
minutes at 5 lpm and 1 s time resolution. Clean air test is marked by status 2048. After the
test a report is generated:
Clean air test report.
Serialnumber: AE33-S02-00232
Date and time: 01 Dec 2014 13:41:03
Duration: 00:20:00, Timebase: 1 sec, Flow: 5000 mlpm
AverageBC
Spot1 Spot2 Spot1 Spot2
Ch1 92 160
Ch2 38 76
Ch3 37 89
Ch4 46 128
Ch5 47 108
Ch6 24 94
Ch7 32 107
Result of clean air test is acceptable.
Interpretation of the results:
- Average BC values should be close to zero if the Aethalometer is warmed up (was
measuring for a few hours just before conducting the test). It is possible to observe a
short transient due to filter compression.
- Point to point variation of BC (PPBC) is calculated as an average absolute difference
between the consecutive BC measurements. It depends on the selected timebase, flow
and tested channel. A test criterion for 1 s time-base test at 5 lpm flow is: PPBC61 < 550
ng/m .
3
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User's manual – Ver. 1.53
PPBC (ng/m3)
193 398
255 592
268 600
307 672
308 668
385 848
437 916
July 2015 68/75