Improved Anemometer Thies First Class Advanced X - low power

• The improved Anemometer Thies First Class Advanced X - low power has the best classification values on the market.
• Its built-in pressure sensor automatically corrects the wind speed measurement depending on air pressure.
• The new low power version has an even lower consumption (typ. 14 mA at 12 V in IEC classified mode).
• Up to eight sensors can be connected in a single bus.
• Since the old version uses the same communication protocol as the new one, they can be used in the same bus.

Low power configuration of sensor fulfilling the IEC classified mode (Heating OFF)

Per default we deliver the sensor in a configuration which is at the same time low power and IEC classified (Heating OFF).

If you do not have large power ressources in your measurement campaign (especially offgrid) we recommend you to keep this default configuration.

Then both the counter and the serial output give the air pressure corrected wind speed output which obtained the excellent IEC classification result (Heating OFF), but at the same time keeps a low power consumption (typ. 14 mA at 12 V).

S Classification value for warm climate countries (≥ +15°C)

Please note that if your measurement campaign takes place in a country with a warm climate (no season below +15°C), then the S classification value for this climate will match the IEC classified mode (Heating ON) even if the sensor is configured in low power mode. (see S classification of Anemometer Thies First Class Advanced II).

High power configuration of sensor to be in IEC classified mode (Heating ON)

If you have large power ressources available in your measurement campaign (up to 20 W available per anemometer), and you have climate with cold winter, then please inform us, we will configure the sensor in order that it fulfils the IEC classified mode (heating ON).

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: