Sensor maintenance
Every month, do a visual/audio inspection of the 
anemometer An instrument that measures wind speed and pressure. at low wind speeds. Verify the propeller and wind vane bearing rotate freely. Inspect the sensor for physical damage.
Replace the anemometer bearings when they become noisy, or the wind speed threshold increases above an acceptable level. The condition of the bearings can be checked by using the Propeller Torque Disc, as described in the R. M. Young manual (see www.youngusa.com/product-category/wind-sensors-accessories 
).
The potentiometer A three-terminal electrical component that can be used as a voltage divider or variable resistor. has a life expectancy of fifty million revolutions. As it becomes worn, the element can produce noisy signals or become non-linear. Replace the potentiometer when the noise or non-linearity becomes unacceptable.
Campbell Scientific recommends factory replacement of the bearings and potentiometer. Refer to the Assistance page of this document for the procedure of acquiring a Returned Materials Authorization (RMA). Mechanically-adept users may choose to replace the bearings or potentiometer themselves. Instructions for replacing the bearings and potentiometer are given in R. M. Young manuals (www.youngusa.com) 
).
