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Thread: Hanna Digital Refratometer all over the map

  1. #1
    Join Date
    Feb 2010
    Location
    Leeds County,Ontario,Canada
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    881

    Default Hanna Digital Refratometer all over the map

    Was checking syrup that we were rebottling today,refractomer was reading 67.4, then 68.3 ,then 69.7, then70.1 .....what gives? Then I noticed when I turned it on showed battery power at 35, put in a new battery,power at 91, now readings at 66.7,66.9 ,now thatís more like it.
    7th generation maple producer in sugarhouse built in 1892
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  2. #2
    Join Date
    Aug 2016
    Location
    whitney point NY
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    102

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    Quote Originally Posted by Bruce L View Post
    Was checking syrup that we were rebottling today,refractomer was reading 67.4, then 68.3 ,then 69.7, then70.1 .....what gives? Then I noticed when I turned it on showed battery power at 35, put in a new battery,power at 91, now readings at 66.7,66.9 ,now thatís more like it.
    I have found best results are done right at kitchen table , syrup and hanna are at room temp.

  3. #3
    Join Date
    Feb 2011
    Location
    Eagle lake Maine
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    211

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    We've found that we need to give it a few minutes to settle before getting an accurate reading.

  4. #4
    Join Date
    Mar 2016
    Location
    Central New York
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    73

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    I have had some erratic readings on my Hanna as well. Talked to them at maple show this week and they said the syrup has to be at room temperature for accurate reading. A little frustrating because I always want to know as soon as I've pressed it what it is I'm bottling up but at least I now know.

  5. #5
    Join Date
    May 2009
    Location
    UVM Proctor Maple Research Center, Underhill Ctr, VT
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    Refractometers, like any tool, have to be used correctly to give good results. Low power may lead to erratic readings. Temperature of the syrup and the instrument have to be the same and NOT changing quickly (either cold syrup or hot syrup or cold/hot instrument). Trying to get a good quick measurement from really hot (or really cold) syrup is an exercise in futility and frustration.

    One thing I don't like about the Hannah unit is that it doesn't have a cover. If you put hot syrup in the well, there can be some evaporation of water from hot syrup before the temperature stabilizes.

    In comparing hand-held optical and digital units...they're all fairly close in terms of accuracy ASSUMING THEY ARE USED PROPERLY. Just make sure to use an automatically-temperature-compensated unit (ATC) or take measurements only at room temperature after the syrup and the instrument have cooled/warmed to room temperature.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    Timothy.Perkins@uvm.edu

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