WXforum.net
Weather Station Hardware => Ambient Weather and Ecowitt and other Fine Offset clones => Topic started by: raedh on September 02, 2012, 05:24:11 AM
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I got both WS-5300 & WS-2080 inside SRSLX100 from ambient weather I mounted both the same location same height 2m above rooftop , the reading in daytime are identical for example both gives 30.8 with no calibration , in night time there is a big difference the WS-2080 always gives a higher readings where WS-5300 more reasonable comparing it to the min-max mercury thermometer inside stevenson box and nearest offical weather stations for example today minimums
WS-2080 : 19.2
WS-5300: 17.2
Nearest station : 17.3
this happened everynight though i made different mounting plans, added a fan to SRS100LX following a post in web, put inside a stevenson screen with standard shield and without it
important thing that our area in daytime has steady breeze 20-35 km/hour, and we have calm nights no more 10 km wind
appreciate any suggestions
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Hi there,
Looks like there is a problem with the WS-2080 as that seems to be way out adding a fan might help but getting a better Radiation Shield might be easiest and more efficient! What is the weather station type called "Nearest Station"?
Thanks
Will
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it is an official weather station for local weather authority.
but the this happens only in night time the daytime readings are excellent, the main difference between daytime and night time is the wind in night is calm no more 8km/h, and the only way i can get readings matched to mercury min-max and other mentioned put ws2080 sensor free at air without any shielding and thats why I added the fan to the shield but Unfortunately nothing changed which is for me really a weird problem
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Hi there,
Ah! So, it could overreads in calmer winds! That might be your problem.
Will
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I think because ws5300 shield is smaller than srslx100 it measure air temperature and cool rapidly than ws2080 and what supprising me that under hot conditions both read the same temperature outside , and the funny thing that ws2080 can read ws5300 singal :grin:
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Hi raedh,
Yup! Smaller radiation shields definitely will be the problem then! :) You've solved it.
Buy a bigger Radiation Shield.
Will
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I'm looking for scientific way to calibrate the ws2080 , do you any idea to properly do it?
Thanks
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I'm looking for scientific way to calibrate the ws2080 , do you any idea to properly do it?
Thanks
On the hardware side of things, if your station uses the individual components (thermistor/humidity sensor) then you can swap out the thermistor for another that reads closer to what you need. The older model LaCrosse and many Oregon Scientific stations use this arrangement but I have a feeling that the Ambient (Fine Offset) line use the all-in-one style chip. These chip sensors don't usually drift like the individual components so changing them with another probably wouldn't change anything.
On the software side of things, maybe you can make adjustments in the station program that alters the low side (nighttime) of the temperature. I know WuHu software has this feature but unsure if its compatibility with the ws2080. Possibly the Cumulus program?
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i will ask in sandysoft forum for this capability because the difference if readings really happens only nigh which is really confusing me
Thanks DanS