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Essential Tips when using a Moisture Analyser

Written by Janice M on . Posted in Food & Beverage

Essential tips for using a Moisture analyser to calculate the moisture content of different substances.

Essential tips when using a moisture analyser

  • Substances / chemicals that CANNOT be tested with a Moisture Analyser:
    • Substances that are explosive, flammable or poisonous fume emitting when heated
    • A substance with a surface that gets dried first and forms a membrane can produce internal pressure that may explode
    • Chemicals or substances with unknown characteristics
  • Measuring ONLY water content:
    Most samples have organic matter that can vaporise included in their moisture content, thus the measure is not ONLY water content. However, minerals such as metal, glass and sand have only water content

  • Sodium Tartrate Dihydrate:
    Sodium Tartrate Dihydrate is often used as a reference standard for moisture rates because of the crystallized water in its molecular structure. This is useful as an accuracy check of the instrument

  • Halogen Heat:
    A halogen light source heats the pan up faster than infrared or other heating methods. Measurements usually take 4 – 20 minutes

  • SHS technology:
    Super Hybrid Sensor (SHS) technology also allows high speed weighing within 1 second and results in a shorter measurement time

  • What temperature to select:
    WinCT-Moisture software helps you decide what heating temperature to set. WinCT-Moisture uses the Optimum Temperature Search program RS-Temp, that has 6 different heating temperatures for the same heating time, in order to provide a "judgement" of A, B, C, D, E and F criteria. Thus, one test measurement allows you to find the optimum heating temperature for your sample

  • Monitoring the Change in Moisture Content over time
    If this feature is of interest, it can be viewed on a graph with the WinCT-Moisture software

  • Sample weight:
    The minimum weight that can be measured is 0.1 g and the maximum weight is 51 g to 71 g, in the case of the MS/MX/ML/MS Moisture Analysers , depending on the model

  • Placement of sample:
    The sample should be placed flat on the pan so that heat distribution is even

  • Low moisture samples:
    To measure samples with a low moisture content, use a larger sample size and it is better to crush it onto small pieces

  • PET samples:
    To measure PET samples, use more than 10 g sample

  • Soybean or Coffee Samples:
    These samples should be crushed in a blender or a mill first because the temperature inside and on the surface can differ. A crushed sample can be evenly heated. Start the measurement soon after crushing, so that the sample does not absorb too much extra moisture from the ambient air

  • Milk or Colloid Samples:
    To reduce surface tension of these samples, use a glass fiber sheet (available as an optional extra) to absorb the sample. This will improve the repeatability rate and shorten the measurement time. Just remember to tare the weight of the glass fiber sheet.

  • Vegetable Samples:
    The sample should be a typical part of it. The part tested should be taken into consideration when samples have many parts.

Read more about the A&D Moisture Analysers.

 

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