VP2 console vs. Weather Envoy readings

[blaforest]

Hey all. Just recently received my VP2 and Weather Envoy with WeatherlinkIP and have noticed a strange problem.

I put both devices inside of a cabinet in an attempt to monitor how close the readings are to each other and noticed that the Weather Envoy was a bit slower when tracking changes. I've calibrated the Envoy to match the console a bit more closely but notice that over time the Envoy will read slightly higher or lower depending on how frequently the temp and humidity change. The only way I can get them to track closely to each other is to remove the cover on the Envoy which gives the Envoys sensors better access to the surrounding air.

Could the WeatherlinkIP be causing this issue despite the fact that the temp and humidity have been adjusted to account for the WLIP? Would it be a better idea to leave the Envoy cover off so that the sensors have better access to the surrounding air?

I know this may seem trivial in the grand scheme of things since they're not that far off but I'm a stickler for accuracy and would really like these two devices to track a little more closely to each other. 

[dalecoy]

Please describe this cabinet.  Also, does your VP2 have a FARS?  Or is there a fan in the cabinet?

Are you sure that the heat from the Envoy+IP is not affecting the ISS readings faster when the cover is off the Envoy?  [Which of course will not be the case when you put the ISS outside].

[blaforest]

Thanks for the reply dale!

The cabinet is just a regular wood cabinet sitting in my office. I put them in there to eliminate excessive air current from fans, windows open, etc. And I'm only trying to get the VP2 console and Envoy to track closely on inside temperature and humidity readings. I just checked them both and see that the temp reading is spot on but the humidity reading on the Envoy is 3% lower than the console even though they are sitting right next to each other.

I'm still new to all of this and I'm starting to realize that I would need a more controlled environment to really get these devices to agree a bit more. I'm thinking I'm going to use a large, clear plastic storage container sealed off with a saline solution inside to regulate humidity. It appears that the console is faster at responding to humidity changes than the Envoy is and it's just something I'll have to live with.   

[d_l]

I think a console if it is standing upright will respond to temperature/humidity changes faster than the Envoy due to a "chimney effect" of air being drawn in on the left side (looking at the console from the back) lower vent holes, being warmed, and them rising out the left side, upper vent holes.  The temperature sensor is located about midway up on the left side while the humidity sensor is near the top of the left side.

A flat mounted Envoy's air flow is less efficient across the sensors than in the console.  Although I've never tried it, you might tilt the Envoy upright to see if having the PC board vertical would improve its circulation.

[blaforest]

Good call d_l! Standing the Envoy upright showed an immediate change to humidity of +2% making it closer to the readings on the console! The downside is that the temperature on the Envoy is rising since there is no venting on the temp side for the heat from the WLIP to escape.  It would have been nice if Davis included additional venting on the Envoy case to allow for better airflow but since they didn't I think I'll modify my Envoy case with additional venting at the top and bottom to allow for better heat removal and airflow.

Thanks again d_l!!