Aethalometer HAP
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User's manual
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Version 1.0 March 2021 6/17
1.2
Intended use and description of the equipment.
The AE33/AE43 internal suction pump draws the sample air stream into the inlet connector
and through the analytical filtration area. The pump speed is under closed-loop software
control to stabilize the sample flow rate to the desired set point. Two flow sensors measure the
airflow in the two sampling streams. Their data is used in the BC calculation as well as for the
closed-loop flow stabilization.
The internal suction pump in combination with the flow sensors can supply a constant sample
flow rate of 5 SLPM up to altitudes of about 3000 m above sea level. When operated at higher
altitudes, the sample flow rate provided by the internal pump will decrease.
Figure 3.
Reported flow as a function of altitude for Aethalometer internal suction pump (red line) and
Aethalometer High Altitude Booster Pump (blue line)
The Aethalometer High Altitude Booster Pump will extend the rated performance of
AE33/AE43 instruments to altitudes of 5000 m above sea level.
4
4.5
5
5.5
6
6.5
7
7.5
8
0
1000
2000
3000
4000
5000
6000
Re
p
o
rted
flow
[
SLPM]
Attitude [m above sea level]
Aethalometer HAP
AE33 internal suction pump
