Author Topic: Froggit DP50/Ecowitt WH31 Temperature Sensor  (Read 539 times)

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Offline gand

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Froggit DP50/Ecowitt WH31 Temperature Sensor
« on: November 26, 2019, 04:14:25 AM »
Hi

According to the specifications, the temperature range is -10C - 60C (14F - 140F). In my area, the temperature can be below -10C (14F). Does anyone have experience with this sensor and a lower temperature?

I want to have the extra sensor positioned optimally in relation to the sun/shade. The weather station itself is located in the sun, so the temperature sensor will not show the right temperature.

Rgds
Gert

Offline whitebluesky

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #1 on: November 26, 2019, 04:46:34 AM »
According to the specifications, the temperature range is -10C - 60C (14F - 140F). In my area, the temperature can be below -10C (14F). Does anyone have experience with this sensor and a lower temperature?

No personal experience. Questions on Amazon were answered as follows:

WH31: https://www.amazon.com/ask/questions/Tx3ROSQKMP140S9/ref=ask_ql_ql_al_hza

WH32: https://www.amazon.com/ask/questions/TxTGAFRPUOJ8BS/ref=ask_ql_ql_al_hza

HTH

Offline gand

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #2 on: November 26, 2019, 05:53:48 AM »
Hi

Thanks, it seems that I should not worry.

Rgds
Gert

Offline Mandrake

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #3 on: November 26, 2019, 08:20:37 AM »
No worries...
I have a WH31 in my Garage Freezer (I can tell if someone has not closed the door properly to the Freezer!)
Its been consistently running in there since March this year on standard Alkaline batteries without a Hitch. My Freezer normally sits around -21C

Hope that gives some reassurance!
Very Old Maplin N96Y/FO Weather station

Ecowitt HP2550A (Wundergroun: IGUILDFO67)
Ecowitt GW1000 (Wunderground: IGUILDFO68)
Ecowitt GW1000 (Mk2) test environment
Ecowitt WH51 Soil Moisture Sensor
Ecowitt WH41 PM2.5 AQM Sensor
Ecowitt WH31 Thermo/Hygro Sensor
Ecowitt WS80 Ultrasonic Anemometer (pre-prod test)

Offline galfert

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #4 on: November 26, 2019, 09:31:54 AM »
I'd highly recommend a radiation shield for any WH31 that will be placed outside if it is not in constant shade.

http://www.ecowitt.com/Others/115.html
WS-2000 & WS-2902A | Ecowitt GW1000 | WeatherBridge (Meteobridge)
WU: KFLWINTE111  |  PWSweather: KFLWINTE111
CWOP: FW3708  |  AWEKAS: 14814
Windy: pws-f075acbe
Weather Underground Issue Tracking
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Offline gand

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #5 on: November 26, 2019, 10:23:17 AM »
Hi

Thanks for the answers, they make me more confident that it is the right solution I have chosen.
BTW, how long do the batteries last in the freezer?

As soon as Lucy at Ecowitt has a quote ready, I will order the shield. Unfortunately, Froggit in Germany does not have it, so I have to order from Ecowitt, with the risk of extra costs, customs, etc.

Rgds
Gert

Offline whitebluesky

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #6 on: November 26, 2019, 10:51:31 AM »
As soon as Lucy at Ecowitt has a quote ready, I will order the shield. Unfortunately, Froggit in Germany does not have it, so I have to order from Ecowitt, with the risk of extra costs, customs, etc.

Mine is on its way. I paid the regular USD 19.99, which includes standard shipping to Germany.

I already got the WH32 for (again) regular USD 12.99 including standard shipping to Germany. Ordered Nov 5, shipped Nov 13, arrived by mail in my mail box Nov 21. No extra costs, taxes, customs.

As USD 19.99 for the shield including shipping is less than EUR 22, in (my understanding of) theory (in Germany) it should not incur "import value added tax" ("Einfuhrumsatzsteuer"). Again in my understanding, customs should not be incurred if price + shipping/insurance + import VAT is less than EUR 150. (The EUR 22 limit was one reason for me to order separately the WH32 and the shield.)

HTH

Offline Mandrake

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #7 on: November 26, 2019, 11:45:05 AM »
Hi

Thanks for the answers, they make me more confident that it is the right solution I have chosen.
BTW, how long do the batteries last in the freezer?

As soon as Lucy at Ecowitt has a quote ready, I will order the shield. Unfortunately, Froggit in Germany does not have it, so I have to order from Ecowitt, with the risk of extra costs, customs, etc.

Rgds
Gert

Well so far its been 9 months on the original set of Amazon AA alkaline batteries so the life seems pretty good since I placed the sensor in the Freezer.
I must admit I am surprised that they have performed as well as they have for this long.
Very Old Maplin N96Y/FO Weather station

Ecowitt HP2550A (Wundergroun: IGUILDFO67)
Ecowitt GW1000 (Wunderground: IGUILDFO68)
Ecowitt GW1000 (Mk2) test environment
Ecowitt WH51 Soil Moisture Sensor
Ecowitt WH41 PM2.5 AQM Sensor
Ecowitt WH31 Thermo/Hygro Sensor
Ecowitt WS80 Ultrasonic Anemometer (pre-prod test)

Offline whitebluesky

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #8 on: November 29, 2019, 10:23:12 AM »
As soon as Lucy at Ecowitt has a quote ready, I will order the shield. Unfortunately, Froggit in Germany does not have it, so I have to order from Ecowitt, with the risk of extra costs, customs, etc.
Mine is on its way. I paid the regular USD 19.99, which includes standard shipping to Germany.
My shield arrived today, Nov 29, by regular mail after having been ordered Nov 21. Despite the parcel having been opened by customs, there were no extra costs, taxes or customs.

Offline gand

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #9 on: November 29, 2019, 03:32:38 PM »
Hi

I also paid USD 19.99 for the shield and shipping to Denmark. According to T&T, the package is on its way to Denmark. I order the shield Nov 27.

Rgds
Gert

Offline GHammer

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #10 on: December 02, 2019, 10:28:04 AM »
Hi

I also paid USD 19.99 for the shield and shipping to Denmark. According to T&T, the package is on its way to Denmark. I order the shield Nov 27.

Rgds
Gert

How do you like the shield? I'm looking for one and wondered if this one is useful.

Offline whitebluesky

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Re: Froggit DP50/Ecowitt WH31 Temperature Sensor
« Reply #11 on: December 03, 2019, 09:22:14 AM »
I don't have any experience, so I can only supply a data point.

The attached picture shows the location of the WH32 in the shield and hanging on a string an old-ish temperature sensor for a radio-controlled Oregon Scientific alarm clock. In addition I put a WH31 on the railing (?: English) to cross check whether the Oregon sensor might be "in a sea of cold". The balcony is facing north-west, the picture is taken at about 2:30 pm local time, and the weather underground station name is IFSSEN8. The sky was more or less clear all day. Before I had the WH32 and the shield I had a WH31 hanging next to the Oregon sensor; they were typically less than 1 C apart.

Today the Oregon sensor never went above 1.5 C; most of the time it was around 1 C. As you can see on weather underground, the WH32 inside the shield reached 8 C. The WH31 was not out there all of the time, but after a while, it tended to agree with the Oregon sensor. So, unless the WH31 also suffers from a sea of cold effect, the WH32 inside the shield and in November (I'm in the Northern hemisphere) is still picking up some solar radiation.

I'd ask other, experienced people to chime in and say whether - based on the data I gave - the shield is doing a reasonable job or not.

Personally, I have to say that I was surprised about the temperature difference between the WH32 in the shield but with November sun, and the Oregon sensor without sun. I am considering moving the sensor to the right side of the balcony (a similar beam is located there; actually it's the "middle beam" of the balcony as my neighbors' balcony is right next there, separated by a wooden panel). I guess the sensor should pick up less sunlight there, but it may be more affected by radiation from the building. If anyone has any thoughts on that, please share.

HTH