Author Topic: Readings from a WH31 in a small shelter affected by sun  (Read 465 times)

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Online broadstairs

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Readings from a WH31 in a small shelter affected by sun
« on: January 28, 2023, 07:28:15 AM »
I have a WH31 mounted about 3 feet below my WS80 on the same pole in a shelter (See here) and when the sun comes out is reads significantly above the reading from my WS80 on occasions almost double in full sun  :shock:

Now when my WS80 temp/hum sensor failed I had this same sensor/shelter combination mounted in shadow on the side of my house under the eaves and the readings were pretty good as it never got any sun. Now I found that I could not keep it there as it was on the outside wall where my boiler is mounted indoors (no where near the boiler flue though) and the boiler uses the same 868mhz frequency for the room stat/controller and kept on losing communication with the room stat because the WH31 is on this same frequency. Now I am unable to mount the WH31 anywhere else in shadow as it will still be too close to the boiler, hence the move to the pole.

So now the question, can anyone suggest an affordable alternative enclosure to use for the WH31 as I want to be able to use this sensor as a back up for the WS80 should that sensor fail again? Preferably one that has been used in anger!

Stuart
Ecowitt GW1003 with ultrasonic wind gauge, lightning sensor and PM2.5 sensor with Personal Weather Tablet as a console.

Online olicat

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #1 on: January 28, 2023, 07:39:08 AM »
Hi Stuart,

what do you mean by "affordable"?
Really good solar radiation shields that you can use in direct sunlight are quite expensive.
Barani Meteoshield Pro and Metspec Rad02 cost more than some people pay for their entire station.

There are a number of do-it-yourself shields that look promising, some of which are actively ventilated.

I personally use a Davis 7714 - but the temperature sensor only fits in tilted position. But the results are acceptable (at least for me).

BTW: With deactivated temperature compensation, my WH65 and WS90 also show values that are clearly too high (+2-3C).
It won't be much better with the WS80.

Oliver

Offline Dador

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #2 on: January 28, 2023, 10:51:17 AM »
I personally use a Davis 7714 - but the temperature sensor only fits in tilted position. But the results are acceptable (at least for me).

I also use the WH31 sensor in the Davis 7714 radiation shield. I believe that this is the best option in relation to the quality of measurements / price. The average daily temperature is almost always the same as in the Barani radiation shield.
The WH31 sensor actually goes in there flat, and with a slight resistance, so there is no need to use other sensor mounts.
Davis VP2 Plus + Barani MeteoShield + DIY Rain Collector Heater + Davis 6345CSOV + Davis 6332 Anemometer.
Ecowitt GW1000 + 7xWH31 + WH32 + WN30 + WH57 + WS68 + WH40.

Offline Gyvate

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #3 on: January 28, 2023, 11:23:29 AM »
I personally use a Davis 7714 - but the temperature sensor only fits in tilted position. But the results are acceptable (at least for me).

I also use the WH31 sensor in the Davis 7714 radiation shield. I believe that this is the best option in relation to the quality of measurements / price. The average daily temperature is almost always the same as in the Barani radiation shield.
The WH31 sensor actually goes in there flat, and with a slight resistance, so there is no need to use other sensor mounts.
Average yes, but the performance (reaction time to changes), especially after heavy rainfalls, snow, ice etc. of the MeteoShield Pro is unbeaten.  :-)
WS2350 1.6.5, GW1000(3) 1.7.6, WH2650 WiFi (2) 1.7.6 (test/backup), GW1100 2.2.3, GW2000(3) 2.2.3, HP2551 1.6.5/1.9.0, WN910 1.2.2;
Ecowitt WS90(2), WS80, WH40, WH65, WH31(5), WH31-EP, WN30, WN34L, WN35, WH32, WH32-EP, WH32B, WH57 [Lightning], WH41 [PM2.5] (2), WH51 (4), WH45, WH55
MeteobridgePro(2)[test,prod] 5.5 Oct 27 2022, 14855 - Blake-Larsen Sun Recorder - RPi4/weewx 4.8.0/CumulusMX 3231/Meteobridge RPi4B-2GB(2886)
Barani Meteoshield Pro, MetSpec Rad02 - Ecowitt 5763,34418;WU ISAARB3(WH4000SE), ISAARB22(HP2553), http://meshka.eu

Offline hiljo

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #4 on: February 01, 2023, 01:57:11 AM »
Average yes, but the performance (reaction time to changes), especially after heavy rainfalls, snow, ice etc. of the MeteoShield Pro is unbeaten.  :-)

Is the WH31 sensor of Ecowitt that precise that a housing of approximately $200 is justifiable?
Ecowitt HP2550C v1.8.7
GW2000 v2.2.2
Beta WittBoy WS90 v1.3.0
3x WH31, WH32, WH40, WH41, WH57
WN34L, 2x WH51, WN35

Dutch translator for Ecowitt.

https://www.weerstationmarsdijk.nl/
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Offline Gyvate

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #5 on: February 01, 2023, 02:13:34 AM »
Average yes, but the performance (reaction time to changes), especially after heavy rainfalls, snow, ice etc. of the MeteoShield Pro is unbeaten.  :-)

Is the WH31 sensor of Ecowitt that precise that a housing of approximately $200 is justifiable?
for everyone to decide what they want - I have a WH32-EP in a MeteoShield Pro and a WH31-EP and a normal WH32 in a MetSpec Rad02 - the deviations between the latter two are max 0.2C
A WH32 would behave the same way as a WH31 as the specifications are the same.
By the way, the observed deviations between the WH32-EP in MeteoShield and WH31-EP in MetSpec are usually +/- 0.1 C
WS2350 1.6.5, GW1000(3) 1.7.6, WH2650 WiFi (2) 1.7.6 (test/backup), GW1100 2.2.3, GW2000(3) 2.2.3, HP2551 1.6.5/1.9.0, WN910 1.2.2;
Ecowitt WS90(2), WS80, WH40, WH65, WH31(5), WH31-EP, WN30, WN34L, WN35, WH32, WH32-EP, WH32B, WH57 [Lightning], WH41 [PM2.5] (2), WH51 (4), WH45, WH55
MeteobridgePro(2)[test,prod] 5.5 Oct 27 2022, 14855 - Blake-Larsen Sun Recorder - RPi4/weewx 4.8.0/CumulusMX 3231/Meteobridge RPi4B-2GB(2886)
Barani Meteoshield Pro, MetSpec Rad02 - Ecowitt 5763,34418;WU ISAARB3(WH4000SE), ISAARB22(HP2553), http://meshka.eu

Offline Fergie

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #6 on: February 05, 2023, 10:05:35 AM »
How do these shelters compare to Ecowitt's RS0001 Sensor Shelter?

I'm thinking of getting an outdoor WH32 temp sensor, rather than relying on the one in my WS69 which is about 5 meters up on a pole. I have the option of keeping it in the shade next to a wall / fence etc.

Online broadstairs

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #7 on: February 05, 2023, 10:10:37 AM »
How do these shelters compare to Ecowitt's RS0001 Sensor Shelter?

I'm thinking of getting an outdoor WH32 temp sensor, rather than relying on the one in my WS69 which is about 5 meters up on a pole. I have the option of keeping it in the shade next to a wall / fence etc.

The one I'm using is similar in size to that one but slightly different inside, my thoughts would be not much different to mine, too small to be effective for temp/hum.

Stuart
Ecowitt GW1003 with ultrasonic wind gauge, lightning sensor and PM2.5 sensor with Personal Weather Tablet as a console.

Offline Gyvate

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #8 on: February 05, 2023, 11:25:15 AM »
How do these shelters compare to Ecowitt's RS0001 Sensor Shelter?

I'm thinking of getting an outdoor WH32 temp sensor, rather than relying on the one in my WS69 which is about 5 meters up on a pole. I have the option of keeping it in the shade next to a wall / fence etc.
The RS0001 shelter/radiation shield is only good for protection against the elements, not for proper temperature/humidity readings. Too little proper ventilation.
It's good for housing a WH57 (now sold together) or when you keep it in permanent shadow e.g. Northern side of a building. Then even a WH32/WH31 could be put in and the low ventilation may not impact the readings too much.
WS2350 1.6.5, GW1000(3) 1.7.6, WH2650 WiFi (2) 1.7.6 (test/backup), GW1100 2.2.3, GW2000(3) 2.2.3, HP2551 1.6.5/1.9.0, WN910 1.2.2;
Ecowitt WS90(2), WS80, WH40, WH65, WH31(5), WH31-EP, WN30, WN34L, WN35, WH32, WH32-EP, WH32B, WH57 [Lightning], WH41 [PM2.5] (2), WH51 (4), WH45, WH55
MeteobridgePro(2)[test,prod] 5.5 Oct 27 2022, 14855 - Blake-Larsen Sun Recorder - RPi4/weewx 4.8.0/CumulusMX 3231/Meteobridge RPi4B-2GB(2886)
Barani Meteoshield Pro, MetSpec Rad02 - Ecowitt 5763,34418;WU ISAARB3(WH4000SE), ISAARB22(HP2553), http://meshka.eu

Offline box

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #9 on: February 05, 2023, 12:52:46 PM »
How do these shelters compare to Ecowitt's RS0001 Sensor Shelter?

I'm thinking of getting an outdoor WH32 temp sensor, rather than relying on the one in my WS69 which is about 5 meters up on a pole. I have the option of keeping it in the shade next to a wall / fence etc.
The RS0001 shelter/radiation shield is only good for protection against the elements, not for proper temperature/humidity readings. Too little proper ventilation.
It's good for housing a WH57 (now sold together) or when you keep it in permanent shadow e.g. Northern side of a building. Then even a WH32/WH31 could be put in and the low ventilation may not impact the readings too much.

Thats what I use

The RS0001 provides weather protection and the temp sensor is in shade and shelter all year atound on a north facing wall

Offline alanb

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Re: Readings from a WH31 in a small shelter affected by sun
« Reply #10 on: February 05, 2023, 01:47:27 PM »
How do these shelters compare to Ecowitt's RS0001 Sensor Shelter?

I'm thinking of getting an outdoor WH32 temp sensor, rather than relying on the one in my WS69 which is about 5 meters up on a pole. I have the option of keeping it in the shade next to a wall / fence etc.
I have Ambient Weather WH31E temp/humidity and WH31L lightning sensors mounted in an AcuRite 06054M shield. These sensors are equivalent to the Ecowitt WH31 and WH57. I chose the Acurite shield because it is inexpensive and I like its shape. I do have it mounted in a shaded spot and so far it is working out well for me. This link has a couple of pictures of the installed sensors in this shield: https://www.wxforum.net/index.php?topic=42649.

Note: I think the Acurite shield is available in the UK from Amazon, but I am not sure.
Alan - Ambient WS-2000, WH31E x4, WH31L