RH shows approx. 9-10% RH too much

My first Ruuvitag, sitting outdoors, has given up,
it now shows all the time approx. 9-10% RH too much.
It started in winter when I discovered it was 100% RH.
I took another Ruuvitag and placed next to it.
Changed the batteries between them, but no change.
Had them indoors for 14 days but no change.
I have a picture from May, where it still shows
100% RH at night.
So now comes Espruino on it, and a sensirion sensor
Purchased on 30/6-2017


Thanks for the data. Just to clarify, was the tag originally giving you good values and has the humidity sensor gone bad later? Was it a sudden event, or has it been a gradual shift?

It has worked fine until this winter.
I became aware of it as the view in my greenhouse
was below 100% RH, and it felt more humid than
Unfortunately, I can’t go back beyond March,
when my raspberry gave up working on wireless wifi.
I tried with a new image, with the same result, so
now I run the wired network.

Thanks for the additional details. Bosch is currently investigating a few units with similar symptoms in their laboratory, we’ll inform them of your tag. Please keep the tag for now in case it is needed for the failure analysis.

I will do. Thank you.

I have similar issues.

@otso Do you want me to send you a malfunctioning tag.

Maybe this information will add some insight FAQ:-Temperature,-humidity-accuracy

Thanks for the offer, the lab has enough units for investigation for now. Please keep the tag for now, we’ll know more about the issue in next few weeks.

Today it is up to 18% RH too high.

Just to let you hnow.

I have taken my ruuvitag out of service and taken out the battery, put it in a box with another ruuvitag that measures temperature and humidity.
The temperature is between 20 and 22.5 degrees Celsius and humidity is just under 50% RH.
They must be there 1 week to see if my ruuvitag will rehydrate.

Then it was that I found that the ruuvi station on the iphone shows +00:00 while my android shows GMT + 02:00.


The clocks are now shown same way in iOS as in Android, the update is in next few releases. Thanks for the report.