I have had several weather stations at this location, bought via RadCom, Maplins & the like & none of them have survived long. They don’t seem to be able to cope with the weather! The latest of these is a Davis Vantage Vue. The package including the software had cost about £600, so I was hoping for a high quality station which would last many years.
The wind speed reading has shown zero for some months. I took advantage of the good weather today to take the sensor assembly down and investigate the problem.
It has been installed for two & a half years, so it is outside the two year warranty period now.
The anemometer and temperature sensor board is marked on the top:
Product: #6357OV, Model No. 6250UK, Manufacturing code MK15102 0050.
On the back is a sticker marked: 7345.405, D151012, GF026.
The magnetic sensor is marked: DAVIS 1507.
With the case off and the other telemetry working, I tried waving quite a powerful magnet near the magnetic anemometer sensor. This produced no reading.
I stripped away the water-proofing from the sensor device. I measured the resistance across it, in situ: 830 ohms.
I put an oscilloscope across the device and spun the anemometer magnets over the device. This produced voltage kicks, both positive & negative! So perhaps the device is a Wiegland wire sensor rather than a reed switch? This suggests that the rest of the rectifier/switching circuit is working.
I checked the receiving station: it showed a wind speed reading!
I put it all back in the box: no reading! I took the lid off the box again and re-soldered the two connections to the device, using a dab of flux & a little extra solder. Still not working. Perhaps there is some sort of intermittent fault?