Vaisala WAA151 - Manual (Page 17)

Chapter 4 ________________________________________________ Maintenance
VAISALA__________________________________________________________15
CHAPTER 4
MAINTENANCE
This chapter provides information that is needed in the basic
maintenance of the WAA151 Anemometer.
Periodic Maintenance
Cleaning
Heavy contamination in the cups, such as bird dropplets or
ice will deteriorate the accuracy of the anemometer. Clean
the cups when necessary.
Testing Proper Operation
The sensor will hold its accuracy in all conditions for 1 year.
If the rains are mostly casual and moderate, and the
atmospheric corrosion is typical, the sensor accuracy will
remain for 2 years.
However, the ball bearings must be checked once a year and
the sensor shaft rotated manually. To do this, remove the
cup wheel. To ensure proper operation, the shaft should spin
smoothly and it should not create any detectable noises.