Weather Station Hardware > Oregon Scientific Hardware
Replace THGR968 sensor for low humidity readings?
Anthony:
I am currently using one of the THGR-268 sensors. But I still experience a low humidity reading. So I entered an offset into my weather software (VWS) to compensate.
Downlinerz2:
Anthony, Andrew & Jim,
I really appreciate all the good advice. I had looked on the OS website and saw that the THGR268 was replaced by the THGR122NX. At first I didn't think it was the right one since it looked like the other sensor that came with the 968. I am going to send for the THGR122NX and see how it works. Thanks again for everything. I will report back on how things shake out.
Mark :-) ](*,)
sam2004gp:
--- Quote from: Anthony on September 10, 2008, 08:09:15 AM ---I am currently using one of the THGR-268 sensors. But I still experience a low humidity reading. So I entered an offset into my weather software (VWS) to compensate.
--- End quote ---
Sort of same here....
After all my testing this weekend I added a +11 offset and at the most it is about +/- 3% of my "Radio Shack Version of the THGR268"(Ch 1). One of my difficulties in getting my problem pinned down, was I also had a bad "Radio Shack Version of the THGR268". Luckily I had 3 of these and i reconfigured their channel IDs, and moved the "bad one" to an area I am not concerned with as far as humidity (My Computer room temp sensor Ch3).
http://www.wxforum.net/index.php?topic=2021.0 <<<<< A long read, and since I turned off the graphic of the extra humidty channels as far as my website is concerned, the thread may be hard to follow. You were warned. :-) :oops:
tomwxman:
--- Quote from: jwyman on September 10, 2008, 07:48:00 AM ---I had the same problem you are having with the original THGR968 unit shipped with the WMR968 system. OSI sent my 3 replacements over time and they ALL had the same problem ( lower humidity readings).
--- End quote ---
How long has it been since you tried the replacements? We can hope I suppose that they would make a design change/improvement at some point. The problem I have with using any Ch 1-2-3 sensor is that I want the sensor to appear in the OA sensor part of the WMR968 display--I have two such displays and like to use them as well as the computer program.
I took the THGR sensor apart and as one might expect, there are "no user serviceable parts inside". Looks like if there's any "factory calibration" it involves selection of a soldered-on resistor i.e. there's no on-board pot. FWIW the sensor itself looks like a resistive type. It looks like the first sensor in Photo 2 on this page.
Sure would be nice though if someone could figure-out how to make the standalone sensors w/Ch 1-2-3 to operate on Ch 0 for the correct spot on the 968 display!
W Thomas:
It would be nice if there was room for a 10 turn precision pot or something of the like for calibration.
Software calibration works good but something like this would give more headroom in the adjustment area.
I still use the original supplied sensor and I hope it continues to work at least as good as it does now..
Wayne
www.smythweather.net
cw8217
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