[wxqc] Vantage Pro Barometer problems

[Steve]

The problem had to do with the fact that the Vantage Pro station reports Sea 
Level Pressure (SLP) but CWOP wants altimeter for the the pressure. The two 
values are not the same, and the difference between them increases with the 
elevation of your station location. However, that should no longer be an 
issue if people are using the latest version of WeatherLink. Davis recently 
made a change so that WeatherLink calculates the proper altimeter value and 
sends that to CWOP. Several other software programs that connect to the 
Vantage Pro also will correctly calculate and send the alitimeter value, 
although you may need to enable that feature in the configuration screen. 
So, for most people, there should no longer be any need to do goofy 
workarounds for the VP pressure to get good data to CWOP.

Steve
SoftWx

----- Original Message ----- 
From: "webmaster" <webmaster at farmingtonweather.com>
To: <wxqc at lists.gladstonefamily.net>
Sent: 04/10/2008 8:43 PM
Subject: [wxqc] Vantage Pro Barometer problems


> Hello again,
>
> Awhile ago I brought up the issue of barometer error and a local
> person who has been around long enough to have a 3-digit CWOP number
> said the barometer problem with the Vantage Pro is a known issue and
> he had to "lie" regarding his altitude to get proper readings.  Here
> is what he said:
>
> "It looks like you have a Vantage Pro. Your pressure was good at 1016
> millibars and fell more
> rapidly then KLVN. The solution is to lower your Altitude. Example: I
> am a 1288 feet. I had to
> lower my altitude in the console to 450 feet then adjust the offset
> to the correct pressure. This
> compensated for inaccuracies in the barometric pressure sensor. Now
> it tracks dead on. Try 450
> feet and see how it tracks. Adjust your altitude up if its not
> changing enough or down if its
> changing to much. It took me a while to figure this out but it works. "
>
> Has anyone else heard of this?  If I have to "lie" to get proper
> readings, I am OK with that.  I wrote Davis about the issue and they
> never replied.
>
> Thanks,
>
> Lew
>
> ******************************************
> Lew - Amateur Weatherman
> lew at farmingtonweather.com
> Farmington Weather
> www.farmingtonweather.com
> Farmington, Minnesota, USA
>
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