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Figure 49: Air inlet with mounted flow through adapter for connecting tubes
For mounting and dismounting the diffusion adapter it is sufficient to screw it by
hand. It is not necessary to screw down the diffusion adapter strongly as it has no
sealing function.
For mounting and dismounting the flow through adapter the hexagon key has to
be used. The flow through adapter has sealing functions and has to be carefully
hand-tightened to avoid leakages.
The following pictures show the process of exchanging the adapters:
Operate the active adapter only with connecting in series
the external radon progeny filter (enclosed accessory);
otherwise there is acute danger of contamination of the
plain paper filter at the chamber entrance.
The flow through adapter must be mounted. Even with flow measurements in
open circuit,
the screw cap should be installed in order to avoid distortion of
the measurement values caused by back diffusion -
which might occur
especially in cases very low flow rates are applied.
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