Anemometer Thies FCA II: S Classification report for all temperature range

• A special S classification has been performed for the anemometer Thies First Class Advanced II to assess the classification value for all temperature range and as well for warm climate.
• This classification uses the same parameter as the A classification with exception of the temperature which is variable in the range -20 to +30°C.

The results obtained are:

Classification Report Thies First Class Advanced ll warm climate

Table: Classification index Class s for different air temperatures

We notice that for all temperature ranges +15 to +30°C, the S classification value matches the A1,8 classification value “heating ON” of the anemometer Thies First Class Advanced II, see class A and class B uncertainty. This makes sense since warm temperatures have the same effect on the anemometer as the heating ON.

Source: Summary report AK 151023-1.2 Cup Anemometer Classification, Deutsche WindGuard Tunnel Services GmbH, Varel, Germany, 2017.

Impact:

Actually, the classification is linked to the uncertainty with the equation

where Uj  is the wind speed bin; k the classification value.
For this reason the standard operational uncertainty is as follows: