GW3000 Temperature Compensation

[The Dalek Hunter]

I Have just added and Ecowitt GW3000 to my setup.

It is connected to an unheated WS90.

In the web page setup there is a “Temperature Compensation” option.
When should I tick this.

Oh there is also an “Automatic Frequency Control Option” ??

[broadstairs]

I would suggest taking a search around in the WiKi created by Gyvate (Rainer) and read up on there. The temperature compensation (which is also useable with my WS80) I believe is to do with solar values affecting temperature if I understood correctly and to be honest the Automatic frequency thing I don't use on my gateways either!

Stuart

[sutne]

Can the manual be of any help?
https://oss.ecowitt.net/uploads/202412 ... Manual.pdf

[The Dalek Hunter]

Many thanks - I will take a look

[HansR]

It says (search on Compensation):

Temperature Compensation: Turn on this option to minimize sunlight influence on outdoor temperature measurement if the outdoor temperature and humidity sensor installation site is not ideal. This option works with sensor arrays like WS69, WS80, WS90 and WS85.

I did try it some time ago but noticed no significant effect on the GW1000.

[Gyvate]

It says (search on Compensation):

Temperature Compensation: Turn on this option to minimize sunlight influence on outdoor temperature measurement if the outdoor temperature and humidity sensor installation site is not ideal. This option works with sensor arrays like WS69, WS80, WS90 and WS85.

I did try it some time ago but noticed no significant effect on the GW1000.

depending on your conditions this is quite possible -
the algorithm is
Outdoor_Temp = Outdoor_Temp - CorrectionT
CorrectionT = solar_rad/ (10*cp*k* sqrt(u/0.0009)) {solar irradiation in W/m2 units]
where cp and k are empirically determined constants and u is gust in m/s units and is the bigger value among 0.5m/s or actual gust
cp: 29.3, k: 0.0984

and it definitely has a temperature compensating (reducing) influence at higher solar radiation values
at 700 W/m2 and no wind (or <= 0.5 m/s) it reduces the temperature by 1° C, at 1,000 W/m2 by ~1.5° C
at 10 m/s gust the reduction would be ~0.2 °C (at 700 W/m2) and ~0.3 °C (at 1,000 W/m2)
it makes sense that the reduction is bigger at low wind speeds and less at higher ones

[HansR]

It says (search on Compensation):

Temperature Compensation: Turn on this option to minimize sunlight influence on outdoor temperature measurement if the outdoor temperature and humidity sensor installation site is not ideal. This option works with sensor arrays like WS69, WS80, WS90 and WS85.

I did try it some time ago but noticed no significant effect on the GW1000.

depending on your conditions this is quite possible -
the algorithm is
Outdoor_Temp = Outdoor_Temp - CorrectionT
CorrectionT = solar_rad/ (10*cp*k* sqrt(u/0.0009)) {solar irradiation in W/m2 units]
where cp and k are empirically determined constants and u is gust in m/s units and is the bigger value among 0.5m/s or actual gust
cp: 29.3, k: 0.0984

and it definitely has a temperature compensating (reducing) influence at higher solar radiation values
at 700 W/m2 and no wind (or <= 0.5 m/s) it reduces the temperature by 1° C, at 1,000 W/m2 by ~1.5° C
at 10 m/s gust the reduction would be ~0.2 °C (at 700 W/m2) and ~0.3 °C (at 1,000 W/m2)
it makes sense that the reduction is bigger at low wind speeds and less at higher ones

@Gyvate: Thanks, that is useful.