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Data and monitoring: measuring fibreboard humidity with ETI 8040

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    • CommentAuthorrvb99
    • CommentTimeFeb 23rd 2012
     
    So after all my problems with mould on the inside of my fibreboard sarking, I bought myself a 8040 damp meter. It has settings for hard and soft wood, plaster etc, but I was wondering what setting it should be for fibreboard and whether or not I should adding an additional multiplication factor.

    In fact to be honest I am not sure how the different material setting work. Originally I though that it was just like a multimeter with different ranges, but for example if I stick it into into soft wood I get a different reading depending whether it is set to hard wood or soft wood. I am guessing that there are some other parameters being taking into account.

    If possible I would also like to be able to measure the values of the soft steico flex wood fibre pannels.

    Of course my next question will be what are acceptable normal envelopes for humidity values in these materials.

    thanks for any advice.
    Richard
    • CommentAuthorEd Davies
    • CommentTimeFeb 23rd 2012 edited
     
    Posted By: rvb99I am guessing that there are some other parameters being taking into account.


    I know nothing of these things but would have though that the way electrical resistivity changes with water content is very dependent on the properties of the material so I'd expect there are, indeed, other parameters involved.

    How about doing your own calibration? Put the meter on the most suitable looking range, softwood perhaps. Take a damp sample of your fibre board, measure the dampness, weigh it, put it in the oven on a very low setting for a few hours, weigh it again and measure the dampness.

    You'll now know the actual change in percentage water content (though not the absolute values unless you're willing to consider the oven-baked version as completely dry — I'm not sure how reasonable that would be) and also the percentage readings as shown by the meter so should have a pretty good idea of the difference between readings with softwood and fibreboard.
    •  
      CommentAuthordjh
    • CommentTimeFeb 23rd 2012
     
    As Ed says you could calibrate the meter by oven drying, since the results do depend on what material you are measuring.

    You could also try asking the meter manufacturer or the fibreboard manufacturer for a suitable calibration curve.

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