User`s guide

Chapter 5 ___________________________________________________________ Troubleshooting
VAISALA______________________________________________________________________ 193
Anemometers
Table 35 on page 193 lists some common problems of Anemometers
and their remedies.
Table 35 Troubleshooting Anemometers
Problem Probable Cause Remedy
The data is not received
from the sensor.
The sensor is mechanically
damaged.
Check the cables and connectors.
After removing the connector's
hexagon nut, the connector is bent,
which breaks the connection wires.
Check the connector.
The sensor is not powered properly. Check that the supply voltage is from
9.5 to 15.5 VDC
Some Vaisala products, for example,
WAT12, switch power on to the
sensor only for a very short period
(200 s to 500 s).
Check that the sensor output rises
above (U
in
- 1.5 V) at the end of the
power pulse.
The sensor shaft is
covered with ice and
snow.
The heating element does not
function.
Send the sensor to Vaisala for repair.
The heating element is not properly
connected.
Open the sensor and check that the
heating element outlet is connected
to the connector on the printed circuit
board.
The output from
connector pin C tracked
with an oscilloscope is
not square wave.
The printed circuit board is damaged. Replace the printed circuit board or
send the sensor to Vaisala for repair.
The frequency is not
equal to 14 times
revolution rate.
Current consumption is
more than 28 mA when
the shaft is rotated
mechanically.