Re: [weewx-user] weewx barmeter offset

[p q]

In weewx.conf, look for StdCalibrate

You'll want something like

pressure = pressure - 14

On Sat, Oct 5, 2019 at 12:12 PM Jason <fetm...@gmail.com> wrote:

Is it possible to add a Barometer offset to weewx as my ftp upload shows presssure to be at 14 mb higher than what both my base unit and mercury Barometer shows.

I believe Weewx shows real level pressure which is higher than what it is at my 120 meter high  location.

I have been thro all config entries etc and cannot find an answer

--
You received this message because you are subscribed to the Google Groups "weewx-user" group.
To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/acdea1c1-f2de-43b6-a5dd-51df64c18de6%40googlegroups.com.

--

Peter Quinn
(415)794-2264

[gjr80]

Hi,

The StdCalibrate service (http://weewx.com/docs/usersguide.htm#StdCalibrate) will allow you to apply corrections to fields. Though if as you say the issue is your console displays a different pressure it may be that your console is displaying one of the three available ‘pressures’ (barometer, pressure or altitude) and WeeWX is displaying another (most likely barometer). If this is the case applying a correction, whilst making things look nice, is just going to corrupt your archived data.

I suggest you read the wiki entry ‘Barometer, pressure and altimeter’ (https://github.com/weewx/weewx/wiki/Barometer,-pressure,-and-altimeter). If you look into your stations specs and the respective driver it should be clear what ‘pressure’ is displayed on your console and being emitted by your station/driver. You can then decide what ‘pressure’ you wish WeeWX to display.

Gary

[Les Niles]

Jason, is the base unit adjusted for your station elevation? By convention barometric pressure is reported adjusted to a sea-level equivalent, and the 14 mb discrepancy you mention is suspiciously close to what the correction would be for 120 m elevation. Mercury barometers measure the absolute pressure directly and I think the elevation is generally applied through some kind of table lookup, not by adjusting the mercury height scale. Weewx makes the elevation correction automatically, based on the station elevation in the config file. In other words, the weewx reading may already be correct. 

  -Les

On Oct 5, 2019, at 1:29 PM, p q <peterq...@gmail.com> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/CAA1SM20X8_ga%3D3r%3DVtHvYWinfOdys5OLEXMieU9VEAa5E2Uz1Q%40mail.gmail.com.

[rich T]

Believe that is the 3 hour trend.

On Sunday, October 6, 2019 at 8:39:26 AM UTC-4, Jason wrote:

I changed this and it is now is correct on the ftp page.

I also changed from US to Metric

[StdCalibrate]
 
          pressure = pressure -14

[StdQC]
   
    [[MinMax]]
        barometer = 970, 1040, mbar

Thanks all for your help

This is my ststion, I am not sure why the Barometer shows N/A et the end of the reading.

Index of /g/g4bgq-drm//index/weewx