Author Topic: Temp probe with SHT35  (Read 5651 times)

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Offline Platokidd

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2- WS-2000 2-WS-2902A ARRAYS 1-CONSOLE 2-WH40-RAIN 1-WH31L 1-METEOBRIDGE 2-PM2.5
3-WH-31E 1-SRX100LX 1-WH31SM

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Offline KD7GFL

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Re: Temp probe with SHT35
« Reply #76 on: January 18, 2022, 01:16:36 PM »
I wonder how clear and see through that clear cover lasts after a year in the sun. If you get it...please post a year from now and share a picture.


Going through some old topics and I came across this post.  As requested 18 months later: 

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Equipment: GW1000, WS-68, WH40 (w/WH65 Funnel for improved accuracy), WH32-EP (Davis 7714), WH-31 X 2, WH-32, WH-57, HP2551-C, and an Ambient WeatherBridge.

Offline abusuzuki

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Re: Temp probe with SHT35
« Reply #77 on: February 04, 2022, 03:18:37 PM »
A very useful topic, as it shortened a lot of research for me, especially providing links to some tools from Amazon. Thank you to everyone who replied to this topic. But I have a question. Can anyone confirm whether WH32EP reads the humidity below 10%?

Online Gyvate

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Re: Temp probe with SHT35
« Reply #78 on: February 04, 2022, 03:55:13 PM »
Specifications: WH32-EP

Power:2 AA batteries(not included)

Sensor Size: 123x42x14mm ; Cabe length: 1M/3FT

Temperature range:-10C 60C (14F - 140F)

Temperature resolution:0.1C, or 0.1F

Temperature accuracy: 0.2C

Humidity range: 10% ~ 99%

Humidity resolution:1%

Humidity accuracy: 1.8%

Sensor reporting interval: 64 seconds
Froggit WH4000SE (=EW 2320E) 1.6.4/GW1100 2.1.4/Froggit DP1500 1.6.8 (+EW GW1000 (4) 1.6.8/7.2 test/backup)/HP1000SE Pro (HP2551) 1.6.4/1.7.8, WH2650 WiFi (2) 1.7.2,GW2000 2.1.4;
Ecowitt WS90-,WS80,WH40,WH65,WH31(5),WH31-EP(1),WN30/DP30 (1),WH32(1),WH32-EP(1),WH32B [T/H/P] (1), WH57 [Lightning] (1), WH41 [PM2.5] (2), WH51 [SoilMoisture] (5), WH45, WH55 (2)
MeteobridgePro(2)[test,prod 5.4 May 07 2022, 14745 - Blake-Larsen Sun Recorder - RPi4/weewx 4.5.1/CumulusMX 3183/MB RPi4(2671)
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Ecowitt 5763,34418;WU ISAARB3(WH4000SE), ISAARB22(HP2553), http://meshka.eu

Offline Platokidd

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Re: Temp probe with SHT35
« Reply #79 on: February 05, 2022, 08:33:12 AM »
The sensor actually can measure from -40F - 140F(-40C ~60C) and send the data to receiver. However the screen display of the sensor might not work below 14F(-10C).
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Ambient    
2- WS-2000 2-WS-2902A ARRAYS 1-CONSOLE 2-WH40-RAIN 1-WH31L 1-METEOBRIDGE 2-PM2.5
3-WH-31E 1-SRX100LX 1-WH31SM

ECOWITT
3-HP2552-WH51 9-WH31-2-WH45-1-WH55
2-GW1000 1-GW1100- 4-WH51 1-WH32EP

1-Stratus Rain Gauge

Online Gyvate

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Re: Temp probe with SHT35
« Reply #80 on: February 05, 2022, 10:16:01 AM »
The sensor actually can measure from -40F - 140F(-40C ~60C) and send the data to receiver. However the screen display of the sensor might not work below 14F(-10C).
yes, but the central question was about relative humidity < 10%
Froggit WH4000SE (=EW 2320E) 1.6.4/GW1100 2.1.4/Froggit DP1500 1.6.8 (+EW GW1000 (4) 1.6.8/7.2 test/backup)/HP1000SE Pro (HP2551) 1.6.4/1.7.8, WH2650 WiFi (2) 1.7.2,GW2000 2.1.4;
Ecowitt WS90-,WS80,WH40,WH65,WH31(5),WH31-EP(1),WN30/DP30 (1),WH32(1),WH32-EP(1),WH32B [T/H/P] (1), WH57 [Lightning] (1), WH41 [PM2.5] (2), WH51 [SoilMoisture] (5), WH45, WH55 (2)
MeteobridgePro(2)[test,prod 5.4 May 07 2022, 14745 - Blake-Larsen Sun Recorder - RPi4/weewx 4.5.1/CumulusMX 3183/MB RPi4(2671)
Barani Meteoshield Pro, MetSpec Rad02
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Offline zoomx

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Re: Temp probe with SHT35
« Reply #81 on: February 05, 2022, 03:12:33 PM »
Datasheet says that SHT35 humidity range is 0-100%

Online Gyvate

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Re: Temp probe with SHT35
« Reply #82 on: February 05, 2022, 04:55:50 PM »
Datasheet says that SHT35 humidity range is 0-100%
@zoomx
yessir, the chip - but there is usually a different performance of the whole system, i.e. what is provided in the end. You don't hang the chip into the air with (what we call in our country) a "Siemens air hook" ;).
I'm sure that Ecowitt know pretty well why they give 10-~99% as specification for the WH32/WH31-EP (and not 0-100).
« Last Edit: February 05, 2022, 04:57:36 PM by Gyvate »
Froggit WH4000SE (=EW 2320E) 1.6.4/GW1100 2.1.4/Froggit DP1500 1.6.8 (+EW GW1000 (4) 1.6.8/7.2 test/backup)/HP1000SE Pro (HP2551) 1.6.4/1.7.8, WH2650 WiFi (2) 1.7.2,GW2000 2.1.4;
Ecowitt WS90-,WS80,WH40,WH65,WH31(5),WH31-EP(1),WN30/DP30 (1),WH32(1),WH32-EP(1),WH32B [T/H/P] (1), WH57 [Lightning] (1), WH41 [PM2.5] (2), WH51 [SoilMoisture] (5), WH45, WH55 (2)
MeteobridgePro(2)[test,prod 5.4 May 07 2022, 14745 - Blake-Larsen Sun Recorder - RPi4/weewx 4.5.1/CumulusMX 3183/MB RPi4(2671)
Barani Meteoshield Pro, MetSpec Rad02
Ecowitt 5763,34418;WU ISAARB3(WH4000SE), ISAARB22(HP2553), http://meshka.eu

Offline CW2274

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Re: Temp probe with SHT35
« Reply #83 on: February 05, 2022, 05:39:20 PM »
Datasheet says that SHT35 humidity range is 0-100%
I'm sure that Ecowitt know pretty well why they give 10-~99% as specification for the WH32/WH31-EP (and not 0-100).
Reply #10 says the 10% limitation would be eliminated. Which is it? Why have a sensor capable of 0-100% but not use it? By not going below 10%, that eliminates pretty much the entire desert SW as a considered PWS if humidity is a concern. We spend at least three months of the year with daily RH's below 10%.

Online Gyvate

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Re: Temp probe with SHT35
« Reply #84 on: February 06, 2022, 01:57:36 PM »
Datasheet says that SHT35 humidity range is 0-100%
I'm sure that Ecowitt know pretty well why they give 10-~99% as specification for the WH32/WH31-EP (and not 0-100).
Reply #10 says the 10% limitation would be eliminated. Which is it? Why have a sensor capable of 0-100% but not use it? By not going below 10%, that eliminates pretty much the entire desert SW as a considered PWS if humidity is a concern. We spend at least three months of the year with daily RH's below 10%.
I don't mind ...
if this is so, and @Mauro63 works closely with Fine Offset/Ecowitt, so it may be.
so post #10 is interesting, but not a solid reference as long as this is not officially published.
Plus, 10% not being any more the lower limit only says, that the limit is now lower and/but not how much lower ...
It may just be "laziness" at the Ecowitt end not to update their doucmentation.
However, it hasn't been documented/updated yet on their web site / manual.
Froggit WH4000SE (=EW 2320E) 1.6.4/GW1100 2.1.4/Froggit DP1500 1.6.8 (+EW GW1000 (4) 1.6.8/7.2 test/backup)/HP1000SE Pro (HP2551) 1.6.4/1.7.8, WH2650 WiFi (2) 1.7.2,GW2000 2.1.4;
Ecowitt WS90-,WS80,WH40,WH65,WH31(5),WH31-EP(1),WN30/DP30 (1),WH32(1),WH32-EP(1),WH32B [T/H/P] (1), WH57 [Lightning] (1), WH41 [PM2.5] (2), WH51 [SoilMoisture] (5), WH45, WH55 (2)
MeteobridgePro(2)[test,prod 5.4 May 07 2022, 14745 - Blake-Larsen Sun Recorder - RPi4/weewx 4.5.1/CumulusMX 3183/MB RPi4(2671)
Barani Meteoshield Pro, MetSpec Rad02
Ecowitt 5763,34418;WU ISAARB3(WH4000SE), ISAARB22(HP2553), http://meshka.eu

Offline mauro63

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Re: Temp probe with SHT35
« Reply #85 on: February 06, 2022, 04:22:35 PM »
Datasheet says that SHT35 humidity range is 0-100%
I'm sure that Ecowitt know pretty well why they give 10-~99% as specification for the WH32/WH31-EP (and not 0-100).
Reply #10 says the 10% limitation would be eliminated. Which is it? Why have a sensor capable of 0-100% but not use it? By not going below 10%, that eliminates pretty much the entire desert SW as a considered PWS if humidity is a concern. We spend at least three months of the year with daily RH's below 10%.
I don't mind ...
if this is so, and @Mauro63 works closely with Fine Offset/Ecowitt, so it may be.
so post #10 is interesting, but not a solid reference as long as this is not officially published.
Plus, 10% not being any more the lower limit only says, that the limit is now lower and/but not how much lower ...
It may just be "laziness" at the Ecowitt end not to update their doucmentation.
However, it hasn't been documented/updated yet on their web site / manual.

I will take care to check this limit and update you as soon as the Fine Offset technicians return from the current holidays in China
Surely it is a typo, if it was not and I do not see technical problems to take advantage of the integral performance of the sensor, I will check if it can be solved through a simple firmware upgrade

Good continuation to all

M.

Offline mauro63

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Re: Temp probe with SHT35
« Reply #86 on: February 07, 2022, 02:43:35 AM »
Hi everyone,

I can confirm that this is a mistake that will be corrected as soon as possible, actually the wh-32 EP displays and works correctly in the 1-99% range

Good continuation

M.

Offline hiljolodewijk

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Re: Temp probe with SHT35
« Reply #87 on: February 07, 2022, 04:57:53 AM »
I can confirm that this is a mistake that will be corrected as soon as possible, actually the wh-32 EP displays and works correctly in the 1-99% range

Thanks Mauro. Question: A mistake in the manual, of in de software/firmware?  :?:

Offline mauro63

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Re: Temp probe with SHT35
« Reply #88 on: February 07, 2022, 07:48:46 AM »
I can confirm that this is a mistake that will be corrected as soon as possible, actually the wh-32 EP displays and works correctly in the 1-99% range

Thanks Mauro. Question: A mistake in the manual, of in de software/firmware?  :?:

No, this is only a mistake relating to the manual and the technical characteristics declared online
thanks for your request

M.