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Data and monitoring: Wood moisture content data logger ... does such a thing exist?

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    • CommentAuthorlineweight
    • CommentTimeApr 11th 2014
     
    I'm going to be doing some long-term data monitoring to track the effects of an internal wall insulation installation.

    The most promising system at the moment looks to be one of these

    http://shop.omnisense.com/p/74/drifi-restoration-monitoring-kit-eu-version

    (lets me monitor temperature, RH and wood moisture content)

    The only thing I don't like about that is that it ties you into a monthly contract for access to their server.

    So I've been checking out alternatives. I can find various things that will let me log temp and RH directly, but it seems impossible to find a wood moisture content sensor that I can embed in the wall long-term and then retrieve data by whatever means (it could be cabled or wireless).

    It seems surprising, as portable moisture content meters are quite common... I'd have expected to be able to get an embeddable version of the same.

    Am I missing something or can anyone suggest anything?
    • CommentAuthorEd Davies
    • CommentTimeApr 11th 2014
     
    Previous, somewhat inconclusive, thread on the same subject.

    http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=10923
    • CommentAuthorBeau
    • CommentTimeApr 11th 2014
     
    You could buy one like this http://www.ebay.co.uk/itm/Protimeter-Mini-Moisture-Meter-/331167374520 leaving the remote probe embeded in the wood. Just plug in when you want a reading.
    •  
      CommentAuthorSteamyTea
    • CommentTimeApr 11th 2014
     
    My DHT11 were about due to be delivered when I had to come upcountry. Hopefully they will be there when I get home.
    • CommentAuthorEd Davies
    • CommentTimeApr 11th 2014
     
    DHT11 will do RH but not moisture content, which is the problem here.
    • CommentAuthorlineweight
    • CommentTimeApr 12th 2014
     
    Posted By: Ed DaviesPrevious, somewhat inconclusive, thread on the same subject.

    http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=10923" rel="nofollow" >http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=10923


    I need something that will log the readings periodically though, not just when I manually take a reading. I don't mind downloading manually every so often but need a consistent stream of readings over time.
    • CommentAuthordaserra
    • CommentTimeApr 12th 2014
     
    What about using the sensor "prong" from a cheap moisture meter and log resistance instead?
    •  
      CommentAuthorSteamyTea
    • CommentTimeApr 12th 2014
     
    I made a resistance logger for my RPi, not very accurate though. May be good enough for this application though.
    • CommentAuthorCWatters
    • CommentTimeApr 12th 2014
     
    Is it possible that the sensor probes would react with the wood over time or perhaps corrode and effect the reading? Perhaps you could bang in some stainless steel nails the same distance apart into various wood samples and calibrate the resistance between them against a portable monitor?
    • CommentAuthorPeterW
    • CommentTimeApr 12th 2014
     
    According to this its a fairly static set of values for wood

    http://www.fpl.fs.fed.us/documnts/fplrn/fplrn008.pdf

    Table on the last page has the resistance values

    Could get an RPi to do a resistance comparator but the wire lengths may play havoc with it

    Cheers

    Peter
    •  
      CommentAuthorSteamyTea
    • CommentTimeApr 13th 2014
     
    I shall have a play when I get back and see what I can cobble together and if the readings make any sense
    • CommentAuthorlineweight
    • CommentTimeApr 14th 2014
     
    Although the idea of a DIY sensor appeals to me in principle I don't think I can afford the time fiddling around to get something that works and is calibrated properly. Plus I'm not enough of an electronics wizard to know how to link it up into a proprietary system and integrate it with the other readings being taken.

    Still find it hard to believe that there's not anything commercially available (aside from that one setup linked to in my OP). Surely moisture content is something other people want to measure over time?
    • CommentAuthorTriassic
    • CommentTimeApr 14th 2014 edited
     
    Effect of interior and exterior insulation on the hygrothermal ...

    www.hoki.ibp.fhg.de/ibp/.../effect_of_interior_and_exterior_insulation.pdf
    by HM Künzel - ‎Cited by 22 - ‎Related articles

    May be something like this research may help identify how the measurements were carried out and identify the equipment used.

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