Damp Meters

Discussion in 'Motorhome Chat' started by Ninovan, Oct 29, 2015.

  1. Ninovan

    Ninovan Funster

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    Just moved this from "This Week I Bought..." Bought it because sometimes can't get a reading from the Protimeter. Now confused!! :confused::confused::confused:

    CEM DT 128 non invasive Moisture meter. Think there may be a problem though.... testing the plastered house wall, get a reading of 22%, which is "dry" according to their table. Using non invasive Protimeter Aquant in the same place, reading is 13.2%. Kamasa pin type shows 12%. Can't check the van at the moment - it's in having some work done. Any ideas anybody? Thanks.
    Chris
     
  2. scotjimland

    scotjimland Funster Life Member

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    The pin meter is reading surface conductivity .. so the reading may well be lower that the non invasive which is looking deeper into the wall..

    the difference between the two non invasive models will be down to calibration.. and quality of meter.. you are comparing a reactively cheap meter .. the CEM DT (which I also have ) with the more expensive Aquant meter.

    don't get too hung up on different reading between different damp meters.. there will always be differences.. but rather look at different readings with the same meter.. ie .. do your own comparisons with known dry wood, damp wood and wet wood .. and use the readings as a guide. .. it's not an exact science
     
    Last edited: Oct 29, 2015
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  3. Ninovan

    Ninovan Funster

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  4. DP_JAY

    DP_JAY Funster Life Member

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    Scotjimland is correct, the DT125 is a very good meter for the price, compare readings from the same meter rather than between meters
     
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  5. tonyidle

    tonyidle Funster

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    Pin-type meters measure the resistance of the substance between the pins. Wet areas conduct electricity and dry areas don't. A real cheapskate (such as I) would push two sewing pins through a piece of firm plastic at around 20mm apart. Connect pins to multimeter set to Ohms then test soaking wet wood, note reading, test dry wood, note reading. When using it to test for damp you will be able to compare the readings with your test readings. Works for me.
     
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  6. PeteH

    PeteH Funster

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    Had a Pin type one for donky`s years. They are a very useful comparison tool. You try on a Known Dry section. (mine goes click click) and then use all over, when you get a wet patch it "screams" at you! Carried it out to Florida, when we bought the Winnie; So dry I Thought is was not functioning!! BTW I test mine by putting across my skin. Easy Peasy.

    Pete
     
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  7. Saltings

    Saltings Funster

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    Don't you find you therefore leave loads of holes in the walls?
    Cheers
    Saltings
     
  8. PeteH

    PeteH Funster

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    Hardly Noticeable and if you choose the right place You have to look really hard to see any mark.
     
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