Vaisala MAWS201 User's Guide Page 54

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User's Guide _______________________________________________________________________
52 ___________________________________________________________________ M210243en-A
0201-016
Figure 33 QMV101/QMV102 Sensor in Water
The following numbers refer to Figure 33 above:
1 = Cable to MAWS
2 = Water level
3 = Sensor level
4 = Local reference
5 = Common level
The sensor should always be protected against the flow and impurities
in the river using, for example, the stilling well or protective plastic
piping.
Fuel Moisture
QFM101 Fuel Moisture Sensor can monitor the moisture conditions
on the forest floor only if it can absorb and give up moisture near a
fair sample of the material that is naturally present. It must exchange
moisture with the air in essentially the same way that the forest floor
materials do.
Mount the sensor on the south side of the tower (or the north side in
the southern hemisphere) so that it is not shadowed by the tower. If
possible, arrange that the sensor is exposed to sunlight for at least six
hours in the middle of the day. Make sure that no grass or other
vegetation touches the sensor; these can transfer moisture directly.
The sensor must be installed approximately one week before it can
give an accurate reading of the fuel moisture on the forest floor.
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