Topic: Temp probe with SHT35

[Platokidd]

This should work

https://www.amazon.com/LMioEtool-Dustproof-Waterproof-Electrical-Transparent/dp/B07PK8K8S2/ref=sr_1_1?crid=2BQ7Q3E1YY5L0&dchild=1&keywords=CLEAR+NEMA+BOX&qid=1635152636&sprefix=clear+nema+box%2Caps%2C95&sr=8-1

[KD7GFL]

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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[abusuzuki]

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%?

[Gyvate]

Specifications: WH32-EP

Power:2 AA batteries(not included)

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

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

Temperature resolution:0.1°C, or 0.1°F

Temperature accuracy: ± 0.2°C

Humidity range: 10% ~ 99%

Humidity resolution:1%

Humidity accuracy: ± 1.8%

Sensor reporting interval: 64 seconds

[Platokidd]

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).

[Gyvate]

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%

[zoomx]

Datasheet says that SHT35 humidity range is 0-100%

[Gyvate]

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).

[CW2274]

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%.

[Gyvate]

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.

[mauro63]

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.

[mauro63]

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.

[hiljolodewijk]

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? 

[mauro63]

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.