Out of curiosity does anyone have this white-ish film on their transducers?
I’ve been noticing a huge reduction in wind speeds the past several months and was curious if something is dampening the anemometer. I live in southern Colorado and have had this system for a little over a year, installed 9/2020. When I lived along the Gulf Coast I don’t believe I had issues with those transducers but I upgraded from the SKY/Air to the tempest.
The white film on the sonic transducers is the Hydrophobic Coating that allows water droplets to fall off via wind, etc. It keeps the “water on the plate” issue that plagued SKY units in the past before the Hydrophobic Coating was applied.
The “water on the plate” issue caused wind readings to be extremely high when very little wind was actually blowing outside.
as mentioned by KJ.Davis, it is a special coating. I looked at a few stations nearby and most show same kind of wind readings. Not identical as that is impossible but the range and timing are close enough to say your Tempest seems ok to me.