Author Topic: Most accrurate indoor humidity sensor?  (Read 391 times)

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Offline Greg_M

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Most accrurate indoor humidity sensor?
« on: April 11, 2019, 09:13:30 AM »
I live in the high desert and the humidity gets very low on occasion, specially indoors.
Just wondering who makes the most accurate humidity sensor (digital or analog) for when it gets in to the teens.

I bought the wife a set of those 5 temp/humidity sensors units so that she can scatter them around the house (she has plants) and I'm not real confident they are telling us the truth.

Suggestions?
The other Greg....
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Online galfert

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Re: Most accrurate indoor humidity sensor?
« Reply #1 on: April 11, 2019, 01:17:47 PM »
Probably not the best...but probably good enough and very flexible and expandable and reasonably priced....

Ecowitt GW1000 as the base console (you see the data live on your mobile). You can also see the data (and graphs) updated every 60 seconds on Ecowitt.net. Online service is free.

Add up to 8 sensors. Have them in every room that you want to monitor and then also add soil moisture sensors to plant pots or garden.

Sensor used is a Sensirion SHT30
humidity range: 10% to 99%
humidity accuracy is +-5%
humidity resolution: 1%

You can buy it directly from Ecowitt or from Amazon.
« Last Edit: April 11, 2019, 01:21:49 PM by galfert »
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Offline miraculon

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Re: Most accrurate indoor humidity sensor?
« Reply #2 on: April 11, 2019, 01:29:05 PM »
I bought one of these from Amazon. The photos show a "Professional Accuracy" insert with a SHT3x device. The claimed range is 1% to 99% RH.



It seems to work well. We don't have desert humidity here in Michigan by any means, so I can't confirm operation at low level RH.

Greg H.


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Offline DaleReid

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Re: Most accrurate indoor humidity sensor?
« Reply #3 on: April 11, 2019, 01:45:26 PM »
A couple years ago I bought a Sensirion sht31 evaluation 'kit' which is a two line lcd display, a coin battery, and a sensor all on an open pc board.  I think it is as accurate as the sensor shows.  The readout is impressive to the hundredths of a decimal point, but doubt if it can really resolve anything that close.  Not elegant, but looks sort of cool and seems to work pretty well.
ECWx.info
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ECWx.info/t/index.php

Offline havtrail

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Re: Most accrurate indoor humidity sensor?
« Reply #4 on: April 12, 2019, 12:58:53 PM »
I bought one of these from Amazon. The photos show a "Professional Accuracy" insert with a SHT3x device. The claimed range is 1% to 99% RH.



It seems to work well. We don't have desert humidity here in Michigan by any means, so I can't confirm operation at low level RH.

Greg H.

This review is right on the Amazon listing, indicating a problem with RH under 10%:

Good measure of humidity, until RH is less than 10%
February 27, 2019
Verified Purchase
This device did a great job monitoring humidity and temperature, until the cold and dry New England winter. At our office, they do not try to control humidity, so it can go really low. Several times I have watched the humidity reading drop down towards 10.0% RH, and as soon as it reaches 10.0% it jumps to 99.8% RH. This has to be a software/ firmware bug. I have never seen the meter display less than 10.0% RH. Changing to fresh batteries and cleaning the contacts does not help. At first I thought that changing batteries fixed the issue, but it was just the moisture from my hands temporarily bumping up the RH of the unit.
I would definitely give this device a 4 star rating, maybe even a 5 star, if it were not for this "feature."

Rich K.
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Offline ValentineWeather

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Re: Most accrurate indoor humidity sensor?
« Reply #5 on: April 12, 2019, 01:18:56 PM »
Problem with Amazon they lump all reviews together even after new models come out. You can't trust all the reviews for sure. The SHT31 version just came out last year and has no problem below 10% humidity.
Look for this indoor sensor nothing available is any more accurate and for $15 its a steal.

Pro Accuracy Indoor Temperature and Humidity Monitor
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Randy

Offline Greg_M

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Re: Most accrurate indoor humidity sensor?
« Reply #6 on: April 16, 2019, 08:02:59 AM »
I got the "AcuRite 01080M Pro Accuracy Temperature and Humidity Gauge with Alarms, Black " and am quite impressed with it.
It's fast in response and seems to be accurate. The price is a bonus.
Thanks for recommending this.

The other Greg....
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Offline txbayou

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Re: Most accurate indoor humidity sensor?
« Reply #7 on: Yesterday at 09:43:03 AM »
This article describes a few more hygrometers: https://www.weatherstationadvisor.com/best-hygrometer-reviews/, but the Acurite model described doesn't look to be one of the newest M suffix models.

I've always been intrigued (haven't bought one yet) by the graphics of the Ambient WS-3000, even if that part of the display is tiny. But it's not for humidity below 10%:https://www.ambientweather.com/amws3000x5.html#caption




Online galfert

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Re: Most accurate indoor humidity sensor?
« Reply #8 on: Yesterday at 10:12:17 AM »
I've always been intrigued (haven't bought one yet) by the graphics of the Ambient WS-3000, even if that part of the display is tiny. But it's not for humidity below 10%:https://www.ambientweather.com/amws3000x5.html#caption

That is because the Ambient stuff uses the Sensirion SHT30. I wonder if anyone attempted SMD soldering or PCB hacking (tapping into board traces) if they could replace it with an SHT31 (or SHT35 or SHT85)....or would it be limited by firmware to still only show min 10% RH.
« Last Edit: Yesterday at 10:14:09 AM by galfert »
WS-2000 & WS-2902A | ObserverIP | WeatherBridge (Meteobridge) | Ecowitt GW1000
WU: KFLWINTE111  |  PWSweather: KFLWINTE111
CWOP: FW3708  |  AWEKAS: 14814
Windy: pws-f075acbe
Tele-Pole flag pole is here (not installed yet)

Offline wase4711

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Re: Most accrurate indoor humidity sensor?
« Reply #9 on: Yesterday at 10:14:25 AM »
lets hope the indoor humidity doesnt go below 10%, ever, that would be terrible!
yesterday here outside Phoenix, the outside humidity was 2% for awhile, according to my VP2..with a temp of 99, and 2% RH, the dewpoint was -7, something I hadnt seen before..

 

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