Temp/Humidity sensor enclosures

[John Diel]

For those that have homebuilt sensor enclosures. I've noticed that almost all of the radiation shields that are made from PVC have a 90 degree turn on the top air inlet. Is there a reason for this or is it simply the "style" as the NWS Mobile Mesonet's had?

I finally broke down and got a temp/humidity sensor for the Davis WM II that I use and the only way to get "good" measurements is to enclose the sensor puck. Since I'm building from PVC I would like to know if there is a reason behind this, or will the straight PVC work just as well.

John Diel

 

[John Diel]

Ok, since no one decided to take up the glove on my first question (except one person via PM), I'll try another one.

Those of you that do have a PVC NOAA style Radiation shield (and I know that some of you do!), how many are passive (no fan or other mechanism to "force air movement") and does this skew your temp/humidity values?

If you have an "active" Radiation Shield (meaning you have a fan or other means of force air movement over the sensors), what are you using and how well does it work?

C'mon folks, I know there's a few out there.

John Diel

 

[Tim Johnson]

Good questions...I'd like to hear some dialog on both of these as well.