Weather Station Hardware > Oregon Scientific Hardware
Looking for suggestions on fan aspiration/humidity issues....
sam2004gp:
I have the WMR968 in the radiation solar shield purchased at ambient. There appears to be no fan aspirated kit designed for the OS hardware and that shield.
Has anyone modified or created a home brew fan aspiration shield for it?
My temps seem to be accurate, but my humidity readings seem to be unrealistic with other non-tramsmitting sensors placed around my property. I was thinking that the fan aspiration may provide more accurate results.
Suggestions?
Here is a pic of what my whole setup looks like right now.
jwyman:
SAM,
Get rid of the THGR968 temp/humidity sensor and get a replacement unit like the THGR268. I think i read that the 268 is being replaced or has been replaced with something else. But whatever you do, do NOT get another 968 unit. I had 3 of them sent to me and the humidity readings were all bad... Get the 268 and never looked back. Works just great....
Jim
sam2004gp:
If you look closely at my first pic, I have one mounted under my bracket. It is the radio shack version of it ( it serves as my channel 1 device), but I think still the same thing. Both units read about the same numbers most of the time.
One of the problems I get in the morning is alot of dew on the OS sensor and it may take about an hour longer for it's readings to catch up to the radio shack model. In the evening the Radio Shack sensor gets the sun exposure at a low angle and then the numbers are off again. But I never seem to match up to any other PWSs or my local tv station.
I was hoping to keep the dew from "saturating" the sensor so much, but then I guess my fan would have to run at night or 24 hours.
Is it possible that I am too close to the ground? The sensors are over just lawn grass, and concrete sidewalk is on the other side of the fence.
Here are the "live" readouts that you can look at to see what I get, I will leave them "active" for a day or so:
mackbig:
Jim,
I posted this question yesterday in reply to one of yours at the old place. I saw your home made FARS. I assumed you were still using the thgr968, so my question was how did you power the fan, as I only saw one wire coming out. So now that I know you are using the thgr268 (which is battery operated), it makes more sense. But same question, what do you use to power the fan. Did you modify your old solar panel from the thgr968, or use something else.
Andrew
--- Quote from: jwyman on September 05, 2008, 09:21:45 PM ---SAM,
Get rid of the THGR968 temp/humidity sensor and get a replacement unit like the THGR268. I think i read that the 268 is being replaced or has been replaced with something else. But whatever you do, do NOT get another 968 unit. I had 3 of them sent to me and the humidity readings were all bad... Get the 268 and never looked back. Works just great....
Jim
--- End quote ---
mackbig:
Sam,
The radio shack unit is identical to the thgr268. I have three of them that sync with a basic radioshack thermo/hygro base unit that I got long before my wmr968. Was pleasantly surprised when I got my OS station and the three additional channels magically started reading... If you think your os one is toast, you could ditch it, the radio shack one will fit inside the pagoda. So once you do that it will eliminate your evening heating due to sun exposure.
The only drawback is that you lose one channel once you swap outdoor temp within vws for channel 1, but if it improves the accuracy then its worth it.
Andrew
--- Quote from: sam2004gp on September 05, 2008, 10:29:23 PM ---If you look closely at my first pic, I have one mounted under my bracket. It is the radio shack version of it ( it serves as my channel 1 device), but I think still the same thing. Both units read about the same numbers most of the time.
One of the problems I get in the morning is alot of dew on the OS sensor and it may take about an hour longer for it's readings to catch up to the radio shack model. In the evening the Radio Shack sensor gets the sun exposure at a low angle and then the numbers are off again. But I never seem to match up to any other PWSs or my local tv station.
--- End quote ---
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