WS-1090 and 100% Humidity

[crgauth]

I have a WS-1090 Solar station. Love it and Cumulus.
Only issue I have is that when it measures 100% humidity, I get 10% in Cumulus.
Which can end up showing some pretty strange dew points when it is raining outside.
I have the 100% when 98% option checked.
Any ideas?
Not sure if it is a weather station issue or Cumulus?
WS Screen shows -- when humidity is 100% as it looks like it only has a 2 digit space for humidity.
Thanks

[steve]

The station must be reporting 255/0xFF for humidity. Normally it does this when the humidity gets below 10%, so Cumulus substitutes a reading of 10% instead. Perhaps yours is reading 255 for some other reason. As I understand it, the stated maximum reading for these devices is 99%, and I believe that if the RH actually is 100%, they normally read 99%. At the times that this happens, you are getting readings in the high nineties before and after?

[crgauth]

Other stations nearby are reporting 100% humidity.
And the display is showing -- as if it is maxed out.
Typically I do see it getting very high and then drops to 10%

[steve]

If you zip up the diags folder and attach it to a reply when it happens again, I'll be able to see what the station is reporting (assuming it lasts long enough for Cumulus to write a log entry and hence write the data to the diags file).

It's odd because I don't recall anyone else having this problem. I'm pretty sure I didn't have it when my Fine Offset station was working properly, and I get 100% humidity here quite often. If this is how the station actually works, I'm not sure what I can do about it if the same value represents both "less than 10" and "100". The best I could do would be a setting to select either 10 or 100 always.

[crgauth]

I have attached the diag file from the time it was happening.
Happened over several days (ended this am).
I post to Wunderground. You can find my data at: http://www.wunderground.com/personal-we ... =KMDGLENB8
Should give you an idea as to when it was out of whack.

[steve]

It appears that your station was actually registering a humidity of below 10%, and not 100%, so Cumulus was correct to display 10%. This can been seen very clearly in the Wunderground data. Here is where it started, on the 23rd:

2014-12-25 19_43_28-Rippling Estates Weather _ Personal Weather Station_ KMDGLENB8 by Wunderground.c.png

Note the values falling towards 10%.

Here is where it stopped, earlier today:

2014-12-25 19_44_14-Rippling Estates Weather _ Personal Weather Station_ KMDGLENB8 by Wunderground.c.png

Note the values increasing from 10%.

So it is clear from looking at the WU data that your station wasn't actually recording high humidity figures immediately before and after, so it was not actually registering 100%, as you asserted, during the period when Cumulus was showing 10%. It was clearly giving the "below 10%" reading.

If these readings are actually not correct, then your sensor is probably faulty.