Aercus WS3083: not showing pressure

[Paolo Franchini]

Hi,

I am using the above station on Fedora 38, but I do not see on the "Seasons" webpage the pressure. wee_device shows the pressure as on the display (note, I have the remote sensors currently disconnected)

[root@fedora bin]# ./wee_device --current
Using configuration file /home/franchini/weewx/weewx.conf
Using FineOffsetUSB driver version 1.20 (weewx.drivers.fousb)
{'usUnits': 16, 'dateTime': 1696712761, 'inHumidity': 81.0, 'inTemp': 20.700000000000003, 'outHumidity': None, 'outTemp': None, 'pressure': 1022.3000000000001, 'windSpeed'
: None, 'windGust': None, 'windDir': None, 'rain': None, 'radiation': None, 'UV': None, 'status': 64, 'ptr': 1996, 'delay': 12, 'rxCheckPercent': 0, 'outTempBatteryStatus'
: 0, 'rainTotal': 0.0}

but weewxd leaves it empty, so I imagine no plots for this reason

LOOP:   2023-10-07 18:37:40 BST (1696700260) 'altimeter': '30.161698861370837', 'appTemp': 'None', 'barometer': 'None', 'cloudbase': 'None', 'dateTime': '1696700260', 'del
ay': '14', 'dewpoint': 'None', 'ET': 'None', 'heatindex': 'None', 'humidex': 'None', 'inDewpoint': '64.22383957565924', 'inHumidity': '82.0', 'inTemp': '69.98', 'maxSolarR
ad': 'None', 'outHumidity': 'None', 'outTemp': 'None', 'outTempBatteryStatus': '0', 'pressure': '30.158976233750003', 'ptr': '1856', 'radiation': 'None', 'rain': '0.0', 'r
ainRate': '0.0', 'rainTotal': '0.0', 'rxCheckPercent': '0', 'status': '64', 'usUnits': '1', 'UV': 'None', 'windchill': 'None', 'windDir': 'None', 'windGust': 'None', 'wind
GustDir': 'None', 'windrun': 'None', 'windSpeed': 'None'

Current configuration:

version = 4.10.2
station_type = FineOffsetUSB
model = WH3081

Many thanks,

Paolo

[Tom Keffer]

Your hardware is measuring "pressure", which is the uncorrected "gauge" pressure. You want "barometer", which is pressure corrected for altitude and temperature. See the wiki article Barometer, pressure, and altimeter for the differences.

To calculate "barometer" from "pressure" requires temperature, as well as station altitude. For whatever reason, your station is not emitting temperature, so "barometer" cannot be calculated.

I don't have enough experience with the Fine Offset stations to comment on why temperature is not being emitted.

-tk

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[Paolo Franchini]

Thanks! On the wiki it says "[...] barometer requires the temperature 12 hours ago in order to correct for diurnal tide effects." So maybe I should not expect the barometer value to be calculated straight away and probably was not running long enough to get it.

the intemp is present, not the external (which maybe is required as well) since have to fix the transmitter first.

[Tom Keffer]

It needs the external temperature (outTemp), not the inside temperature.

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/c19d0dad-3f39-4310-8d65-4c8c54fa77a3n%40googlegroups.com.

[Tom Keffer]

BTW, you're not getting outTemp at all, let alone temperatures from 12 hours ago, so something is wrong with your sensor. Perhaps a bad battery?

[Paolo Franchini]

OK. This explains it all. The external sensor is not connected, so actually the unit is reading only the internal temperature, hence the missing barometer.

[Tom Keffer]

there you go!

To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/f6855b20-3d0d-47a5-8513-c648b1798a0fn%40googlegroups.com.

[Paolo Franchini]

Thanks, and bwt, great software here!