I believe that with your station absolute pressure is the pressure as seen at your station. relative pressure on your station you will have manually set in your station by adjusting for altitude (and will usually be a higher value). The station only outputs the absolute value to weewx - and this is called pressure. weewx will use the altitude specified in weewx.conf to calculate the altimeter value - which should correspond to 'relative' pressure on your station. barometric pressure also involves a temperature compensation. if you want to see the same value on your webpages as the relative value displayed on the station then use altimeter in the webpages.
the correct value to display though is barometer. for this to be correct the station altitude must be specified in weewx.conf On Sunday, 22 September 2019 16:25:19 UTC+3, Miguel Ángel wrote: > > Thanks for your reply Thomas, I had read this article and that's why I > changed the names of sensors to try something. With relative pressure I > want to say the absolute pressure plus an offset. (for example, the > absolute pressure show 950hPa, and the relative pressure show 1011hPa, both > in the station, but weewx only show 950hPa.) Actually I am not an expert in > this topics, but I've always seen the pressure on these figures > (1000-1020hPa), and now I get lost (with 940-960hPa). > > Miguel. > > El domingo, 22 de septiembre de 2019, 14:53:42 (UTC+2), Thomas Keffer > escribió: >> >> Take a look at the Wiki article *Barometer, pressure, and altimeter >> <https://github.com/weewx/weewx/wiki/Barometer,-pressure,-and-altimeter>*, >> and see if that answers your question. If not, perhaps you can tell us what >> you mean by "relative pressure." >> >> -t >> >> On Sun, Sep 22, 2019 at 5:43 AM Miguel Ángel <[email protected]> wrote: >> >>> Hi, I have recently installed WeeWX v3.9.2 in my Raspberry Pi 2, with >>> the PCE-FWS 20. All is working, but this station has Absolute and Relative >>> pressure, and in the section Barometer, WeeWX show me the Absolute pressure >>> and I want to see the Relative pressure. >>> I have tried changing names of sensors in index.html, but doesnt work, >>> and I dont know how to change the source of the barometer. I use NeoWX, as >>> skin (Standar show absolute pressure too). >>> >>> Miguel. >>> >>> -- >>> 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 [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/weewx-user/d30f205c-8e1c-4011-82c2-2d279ab753f2%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/weewx-user/d30f205c-8e1c-4011-82c2-2d279ab753f2%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/188cd079-1745-4e60-9fdb-17dc8aefa524%40googlegroups.com.
