A&D MX-50 User Handbook Manual
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A&D MX-50 User Handbook Manual

Moisture analyzer
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Version 2.20 April 2003
A&D Weighing, USA Version
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LIT:MXUHB April 2003

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Summary of Contents for A&D MX-50

  • Page 1 ’ ’ Version 2.20 April 2003 A&D Weighing, USA Version LIT:MXUHB April 2003...

  • Page 2: Table Of Contents

    Table of contents ¦ MX/MF Specifications and Accessories....................2 ¦ Basic Measurement & Performance Q&A 1. What is moisture content? ...................... 3 2. Method of measurement......................4 3. Accuracy ..........................6 4. Samples ..........................6 5. Calibration..........................7 6. Others ............................. 8 7.
  • Page 3 20 Sample Pans, 2 Pan Handles, Tweezers, Spoon, Test Sample (30g of Sodium Tartrate Dihydrate), CD-ROM(WinCT-Moisture for MX-50, WinCT for MF-50), RS-232C Cable for MX-50, Display Cover, Dust Cover, Instruction Manual, Quick Reference Card, Power Cable, 2 Fuses Specifications are subject to change for improvement without notice.

  • Page 4: Basic Measurement & Performance Q&A

    A. ¦ Basic Measurement & Performance Q&A 1. What is moisture content? Moisture content is usually shown as a percentage of water contained in a solid, liquid or vapor material. Where sample is vapor or liquid, it can be in percentage of weight of water contained in its sample’s volume and it can be called hygroscopic moisture or humidity.

  • Page 5: Method Of Measurement

    2. Method of measurement How moisture content is measured with a moisture analyzer Moisture content can be measured by heating method, Karl Fischer method, Dielectric?Infrared absorption method, neutron analyzer or crystal oscillation method, among which mainly heating and drying method or Karl Fischer method is utilized in many laboratories.
  • Page 6 ¦ Basics Measurement principle of Karl Fischer method is based on the chemical reaction described above. Which is to say moisture content is deemed by the quantity of KF reagent that selectively responds to water and produces anhydrate titrated and needed to react to water completely till end point. The quantity of the KF reagent is electrically detected as the reagent is titrated into the sample in the water.

  • Page 7: Accuracy

    What is the difference between MX/MF 1. MX/MF is a heating and drying method analyzer that and Karl Fischer type analyzer? compares weight before and after heating and drying while Karl Fischer type analyzer titrates KF reagent that contains iodine to sample electric-chemically. 2.

  • Page 8: Calibration

    Can Sodium Tartrate Dihydrate be No. Moisture once decomposed from crystal of the sample recycled? by heat cannot be reconstituted. Can anything be tested with the 1. Material that is explosive and/or flammable or fumes analyzer? when heated are not suitable to be tested by heating and drying method.

  • Page 9: Others

    6. Others Should I consider moisture in a glass You don’t usually have to. However if you want to be very fiber sheet when it is used? strict remove moisture in a sheet dry and store it in a desiccator prior to use. Is absolute measurement of moisture No.

  • Page 10: Heating Method

    7. Heating Method What is the benefit of halogen lamp Heating value per unit of time is higher than other heating incorporated in MX/MF? methods and its useful lifetime is longer. Moisture analyzers with halogen lamps can shorten measurement time taken. Halogen lamps emit much more light than other lamps, which is also beneficial when observing the sample while heating.

  • Page 11: Data Analysis

    What is SHS? SHS stands for Super Hybrid Sensor and is the weight sensor A&D innovated to enable high speed weighing within 1 second necessary for analytical balances requiring high resolution and accuracy. SHS enables the analyzer to capture the dynamic weight and measure moisture content in shorter length of time.

  • Page 12: Data Results & Analysis

    (CV) Analyzer ( g) ( %) ( %) ( %) ( min) MX-50 0.298 0.0045 1.49 0.3072 0.0065 2.13 (1) By the data there is no evident difference between the two analyzer’s results and it could be said that data taken by A&D’s MX/MF can match a Karl Fischer type analyzer.

  • Page 13: Typical Measurement Results By Table

    2 Typical measurement results by table Commodity Process Weight Moisture Content Temp. Time Measurement No. Classification Sample Remarks Mean Mode (Min) Repeatability Value Value Flake leaves and test. 1 Commodity Tobacco 1 Standard-MID 10.58 0.339 3.2 Smells strong while heating. Crush with hand mixer.
  • Page 14 Food A(Grain, Beans, Sea Foods, Seasonings, Spices and Flavoring) Process Weight Moisture Content Remarks Temp Time Measurement Mean No. Classification Sample (Min) Repeatability Program Value Value Corn Grits Food 5 Standard-MID 17.5 12.06 0.072 (Powder) Corn Starch Food 5 Standard-MID 12.74 0.137 1.08...
  • Page 15 Chilli Pepper Food Powder 5 Standard-MID 17.3 5.81 0.06 1.03 Seasoned Chilli Pepper Food Powder 5 Standard-MID 16.9 0.085 1.73 Powder Food Mustard 5 Standard-MID 4.76 0.051 1.07 Powder Horse Food Radish 5 Standard-MID 11.4 0.082 2.22 Horse Radish Crush the sample from above a glass Food 1 Standard-MID 15.1...
  • Page 16 Food B(Processed foods, Dairy products, Snacks and Sweets, Beverage and others) Process Weight Moisture Content Remarks Temp Time Measurement Mean No. Classification Sample (Min) Repeatability Program Value Value Food Bread 1 Standard-MID 36.65 0.550 1.50 Measure after breaking into bits. Bread Food Crumbs...
  • Page 17 Honey (Drying temp., Food 1 Standard-MID 20.4 22.92 1.599 6.98 Put on a glass fiber sheet. 160C) Condensed Food Milk 1 Standard-MID 11.9 25.59 1.59 Put on a glass fiber sheet. Milk Substitute Food 1 Standard-MID 61.83 0.491 0.79 Use a glass fiber sheet. (Liquid) Butter (Solid,Salted)
  • Page 18 Chemicals, Plastic and Rubber Process Weight Moisture Content Remarks Temp Time Measurement Mean No. Classification Sample (Min) Repeatability Program Value Value Skin-Care Cream Spread the sample between two glass Chemicals 1 Standard-MID 77.06 0.543 fiber sheets. (Paste) Sodium Tartrate Chemicals Dihydrate 5 Standard-MID 15.7...

  • Page 19: Windows Tm Communication Software: Winct-Moisture

    A&D, enables easy transfer of measurement data to PC through RS-232C for storage and analysis. WinCT-Moisture (CD-ROM) is a standard accessory attached to MX-50, but it could also be obtained on its own under accessory No. AX-42 WinCT-Moisture, includes four operation modes:...

  • Page 20: Display Sample Of Rsfig

    ¦ Advanced Usage/ B. Data Analysis/2. RsFig 4. Display sample of RsFig RsFig reads data of moisture content rate measurement process (CSV files) and processes it into graphs. The horizontal axis represents elapsed time from commencement of measurement (min.), while the vertical axis represents moisture content rate (%).
  • Page 21 Measurement of such samples can be completed in a short time, by heating at the highest possible temperature. Samples with similar measurement processes include Sodium Tartrate Dihydrate, hand soap, washing powder, soft flour, milk, etc. Starch (MX-50, 5g, Standard-MID) Corn Starch (MX-50, 5g, Standard-MID) MXMF.Users.Handbook.V2.20.doc LIT:MXUHB April 2003...
  • Page 22 When stabilized moisture content curve re-inclines, it is assumed that materials other than water (additives, organic matter) vaporized. In such cases, excessively high temperature could lead to lack of credibility, repeatability and accuracy of measurement values. Soy bean Flour (MX-50, 5g, Standard-MID) Carbonized A little Carbonized...
  • Page 23 Meanwhile, carbonization of sample surface could be avoided by placing a glass fiber sheet on top of the sample, which enables heating under high temperature, therefore shortening measurement time and improving measurement accuracy. Such samples include coffee beans and green tea. Coffee Beans (Crushed) (MX-50, 5g, Standard-MID) Carbonized A little Carbonized MXMF.Users.Handbook.V2.20.doc...

  • Page 24: Automatic Determination Of Heating Temperature By Rstemp

    Time(min) RsTemp is a “Heating temperature determination software”, which determines optimum heating temperature for measurement of moisture content using MX-50 and MF-50. (OTS program: Optimal Temperature Search Program.) The graph shown above displays an example in which Sodium Tartrate Dihydrate is measured with RsTemp.
  • Page 25 ¦ Advanced Usage/ B. Data Analysis/3. RsTemp Heating temperature is judged upon results of measurement performed at different temperatures, evaluating stability of moisture content rate at each temperature (inclination of moisture content rate curve, or primary derivative value Rate (%/min.)). RsTemp is a software designed to determine heating temperature most suitable for the sample, from measured and calculated results.
  • Page 26 Measurement of such samples could be completed in a short time, by measuring at the highest possible heating temperature. Samples with similar measurement processes include Sodium Tartrate Dihydrate, hand soap, washing powder, soft flour, milk, etc. Corn Starch (MX-50, 5g) MXMF.Users.Handbook.V2.20.doc LIT:MXUHB April 2003...
  • Page 27 Advanced Usage/ B. Data Analysis/3. RsTemp Example 2. Moisture content measurement curve inclines sharply from above a particular point in heating temperature Soy Bean Flour (MX-50, 5g) The top graph displays results of measurement on soy powder, below on butter peanuts.
  • Page 28 ¦ Advanced Usage/ B. Data Analysis/3. RsTemp Example 3. unable to determine stable heating condition by changing temperature setting Coffee Beans Flour (MX-50, 5g) This graph shows results measurement on coffee beans. Moisture content rate curve (red) does not stabilize into a planarized line.

  • Page 29: Maintenance

    C. ¦ Maintenance C. ¦ Maintenance 1. Halogen Lamp How long can halogen lamps last? About 5,000 hours. E.g. if you use a halogen lamp for 8 hours a day life time is 2 years. Can I (a user) change the halogen YES, you can replace it with A&D’s optional accessory lamp? AX-34 for MX/MF per instruction manual.

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