acurite access barometric pressure reading incorrect

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  • Updated 7 months ago
I just installed the new acurite access less than 24 hours ago, very easy.  I have not yet disconnected the old smarthub.  The access pressure reading is incorrect.  My old smarthub currently says the pressure is 30.13 inHG,  but the access says it is 30.51.  I believe that the smarthub is correct and the access is incorrect.  How do I fix the access so that it reflects the correct pressure reading?      


Also, when I do disconnect the old smarthub, will my weather underground account be affected?  Will I have to change anything on there when disconnecting the old hub?

thanks for any replies.
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Wyatt Workman

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Posted 7 months ago

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John Z

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Wyatt,

I have installed two Access devices now, and both had uncanny barometer accuracy compared to nearby airport or NWS data. The baro device inside Access is new and appears to be much better than the device in the smartHUB.

What are you comparing against, and why do you think the older device is performing better?

Assuming altitude and calibration settings are same, of course.
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Wyatt Workman

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Hi john, thanks for the quick response.   I am comparing results to the display that is connected to my 5 in 1.  The display says 29.78 currently, the smart hub says 30.04, and the access says 30.43.  I also compared this to my local airport and a neighboring weather station, and both say 30.00".  All calibration settings on both hubs are the same.

Is there a way to calibrate the access, and if so, what is it?  
Thanks.
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John Z

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Yes, if you get into My AcuRite/devices/settings for Access, you will find a +/- cal is possible, at the bottom of the page. It is for My AcuRite only. WU will do what they wish with your baro data to get it in conformance with your neighbors.
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Wyatt Workman

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thanks John.  how do I determine how much to adjust the pressure by?  I have never done this before.  thanks
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John Z

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If you have an airport or a National Weather Service site nearby, that data is pretty good. It can be found on the web. Match it and you should be OK.
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Wyatt Workman

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cool, thanks for all of your help, that was the problem, I think I fixed it, as it appears accurate now.  
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George D. Nincehelser

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I wouldn't calibrate anything to the display.  The SmartHUBs often have a bias depending on their age, so I wouldn't calibrate to that, either.

Set the Access to "adjusted" pressure and make sure the elevation is correct.  The Access has the most accurate baro sensor of the bunch, so you should end up pretty close to the correct sea-level adjusted pressure.

After giving it some time to make the adjustments (say, about 15 or 30 minutes), compare the reading to a local airport or official government weather station.  It shouldn't be far off, but if it is, you'll likely have to tweak your elevation to bring them in line... I don't think there's a specific calibration feature (other than for myAcurite only) for the barometer unless they recently added one.
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AcuRite Rachell, Employee

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Hello Wyatt,
I can see your AcuRite Access is set to 'Station Pressure'. Station pressure is raw data from the Access. Your smartHUB is set for Adjusted Pressure. Adjusted pressure uses the address information provided to give an accurate barometric pressure reading. Please change the Access to Station pressure under Settings>Devices.  Please wait 20 minutes after this has been changed. What are the readings after this is done?
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Jack Canavera

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Wyatt, I have a SmartHUB, and Access device and a separate display screen for each.   I also have another display screen that monitors a tower sensor outside.  So with those AcuRite display devices after running a month each, I find the pressures that each screen displays are within .08 of each other during periods of rapid changes.  During steady barometic conditions I find that they all are within .02 of each other.  With that in mind I use station pressure with the SmartHUB and the Access.  I've found that with adjustments, I can show dashboard temperatures that pretty much mimic my displays.  With these adjustments my displays and dashboards are all within .08 of each other. That gives me the constancy I am looking for.  Quite honestly I don't try to match the NOAA site at the airport since we have about a 200 ft elevation difference and secondly the pressure they report is adjusted to sea level and I'd rather be measuring actual pressure.  For all intents what I am interested in is the rapidity of the changing pressures rather than the actual pressure itself.  

The change in pressure is a good indicator of changing weather conditions.  I find that each device varies somewhat in the rapidity of the display reflecting changing pressures during rapid changing conditions.  That .08 is worse case with the .02 being the best.  
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George D. Nincehelser

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If I remember correctly, the pressure updates every 12 minutes in the displays and every 1 minute in the SmartHUB (or at least the original Acurite Bridge).