Aethalometer HAP
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User's manual
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Version 1.0 March 2021 12/17
3.3
Flow range set valve adjustment
The Flow range set valve is located on the rear panel (Figure 6). The purpose of this valve is to
control the minimum lower flow of the HAP.
Figure 6. Flow range set valve is located on the rear panel.
NOTE:
If the valve is fully open, the minimum lower flow of the HAP may exceed the
maximum flow of the internal AE33/AE43 pump.
This could lead to flow warnings at
certain altitudes between 2500 m and 3500 m above sea level (Figure 7, marked with
red circle). In such cases, rotate flow range set in counterclockwise direction until you
reach 5 SLPM (Figure 8). Refer to the data table in AE33 or AE43 for information about
the current flow.
