| 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. |
Make sure that the supply voltage is 9.5 ... 15.5 VDC. |
| Some Vaisala products such as WAT12 switch power on to the sensor
only for a very short period (200 s to 500 s). |
Make sure that the sensor output rises above Uin - 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. Contact Vaisala Technical
Support. |
| The heating element is not properly connected. |
Open the sensor and make sure that the heating element outlet is
connected to the connector on the printed circuit board. See Replacing consumables. |
| 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. See Replacing consumables and Spare parts and accessories for spare part order code. |
| The frequency is not equal to 14 times revolution rate. |
| Current consumption is more than 28 mA when the shaft is rotated
mechanically. |