User's Guide ______________________________________________________________________
184 _________________________________________________________________ M211296EN-A
Mechanical Wind Sensor Set WA15
Maintenance
Periodic Maintenance
Replace the bearings yearly and check that the printed circuit board is not
corroded. Check operation whenever you tilt the mast.
Cleaning
Heavy contamination in the vane, such as bird droplets or ice will
deteriorate the accuracy of the wind vane. Clean the vane 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 vane assembly. To ensure
proper operation, the shaft should spin smoothly and it should not create
any detectable noise.
Replacing Bearings of WAV151
Replacement of the bearings should only be done by a trained technician.
To replace the ball bearings, follow the procedure below and refer to
Figure 111 on page 187 or send the wind set to Vaisala for maintenance.
1. Open the vane assembly fixing screw with a 2-mm Allen key. The
correct screw is the lower one shown in Figure 111 on page 187.
Remove the assembly.
CAUTION
The vane assembly fixing screw has been treated with sealant. Do not
remove the fixing screw to ensure perfect sealing.
2. Loosen the hex nut of the connector with a 27-mm tool.
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