What's a good humidity meter?
I'm looking for a good, accurate humidity meter. Preferably relative humidity.
Any ideas? Recommendations?
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
Comments
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Bacharach Sling Psychrometer is the standard for measuring relative humidity
https://www.grainger.com/product/BACHARACH-Sling-Psychrometer-6T173
As far as a "humidistat" to operate a humidifier or dehumidifier is concerned, there are many different models that can be employed. I have never found any of them to be that accurate. Calibration is the key to proper humidity control. A standard combination Thermometer/hygrometer for measuring temperature and humidity with an analogue dial readout can be purchased for less than $10.00 on amazon. Likewise the digital version is also available for under $10.00. For accuracy, you can calibrate any device when you place it in the room you want to measure for 24 hours, then use the Sling Psychrometer to measure the accurate RH then set the inexpensive dial meter to the proper RH based on the accurate reading measured by the professional instrument.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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The psychometer is accurate(as long as you wait for the water to get to ambeintish), not necessarily that practical. I have an electronic meter made by Extech. No idea how accurate it actually is
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Sling is probably cheaper and accurate. Humidity is always a moving target.
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Before I bought the electronic hygrometer I used to use an oven probe type thermometer with a piece of wet cord over the probe.
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I've been using this for years. The only accuracy tests are comparing it to the display on dehumidifiers or humidistats I work on. Its always within a percentage or 2, so for the +/- range I need, to me its DOBA. I don't need wb or dew point often. It does take some time to acclimate when you first turn it on. About 5 minutes. After that it registers fairly quickly when taking supply and return readings or something.
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+1 for the Fieldpiece. I've got a couple of 'em (improves the odds since I can only ever find one), plus a dual input and a single input psychrometer, both of which connect wirelessly to my manifold for calculating target superheat.
None of them are calibrated. I should probably look into doing that.
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I have used a dual temperature probe thermometer that can be checked by submerging the probe into ice water. When the water is saturated with ice it is at 32°F or 0°C. Once I know the two probes are accurate, I place a wet cotton shoelace over one of the probes and blow a fan over both probes to get the wet bulb and dry bulb at the same time. Once you have that info, all you need is to have a college course in interpreting a psychrometric chart and Viola! You have the RH you so desperately need for some reason.
Although you do look a little silly swinging a Sling around in circles when you are on the job. I can't remember how many times someone gave me a L👀K when taking that measurement.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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I have the same. No complaints
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from Amazon
govee bluetooth works very well for $12.00. Battery lasted for several years.1 -
Curious, has anyone used one of these bad boys?
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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maybe in middle school
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Back when we called it Junior High.
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I've never even seen one of those bad boys. It looks like the wb is on the right but the wick must be dry because the temperatures are the same. And its not raining in the photo.
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it is a very old school hygromteter, i think it was in my elementary school science books that were published in like 1970 and i think one of the middle school science rooms had one. i'm guessing they've been around since the 20's or 30's. that tube in the middle fills with water and keeps the wick wet.
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Id think a hair type hygrometer is older and still being used.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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i think cellophane is more common now. the wet bulb dry bulb is more accurate if the thermometers are accurate.
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That's the issue I'm having with it.
Most alcohol thermometers aren't terribly accurate.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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You could always make one with 2 thermocouple thermometers.
I'm not sure that it is so much that they are inaccurate rather than the tube slides where it attaches to the scale.
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If that tube slides I should be able to calibrate it and maybe a dab of rtv to keep it there.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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the lower quality ones could also have non uniform tubes too. i have never tried to test or calibrate them, i just know i have seen a lot with the tube sliding around in the pieces of wire if you touch it.
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I have a nice, old brass bodied one that my wife's grandfather used for the wood kiln at the furniture factory he worked at. Never tried it though. Just decorative these days.
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