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Quality Assurance of Rice and Paddy Moisture Measurements in Thailand

  • T. SinhanetiEmail author
  • T. Keawprasert
  • P. Puuntharo
  • W. Triarun
TEMPMEKO 2016
  • 104 Downloads
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science

Abstract

A bilateral comparison in moisture measurement between the National Institute of Metrology Thailand (NIMT) and the Central Bureau of Weights and Measures (CBWM) was organized for quality assuring of rice and paddy moisture measurement in Thailand. The bilateral comparison was conducted by using the same batch of sample and moisture meter as transfer device. It consisted of two parts: moisture measurement in rice and in paddy. A rice moisture meter belonging to CBWM and rice standards prepared at the nominal moisture content of 10 %, 12 %, 14 % and 16 % at NIMT, were used for rice moisture comparison, while a paddy moisture meter belonging to NIMT and paddy standards prepared at the nominal moisture content of 12 %, 14 %, 16 % and 18 % at CBWM, were used for paddy moisture comparison. Both laboratories measured the moisture content of a sample by using the standard method in ISO 712 and used that sample to calibrate a moisture meter by means of the method based on ISO 7700-1. Since the moisture content of the sample can change during the comparison, correction values in moisture content between the standard value and the reading value from the moisture meter are used as calibration results for the comparison evaluation. For the rice moisture comparison, differences in the correction value measured by the two laboratories vary from 0.18 % to 0.46 %, with their combined comparison uncertainty of 0.37 % (\(\hbox {k}= 2)\). The main contribution to the difference comes from the standard values from both laboratories differing from 0.27 % to 0.53 %, as the rice standard was found to drift in moisture content less than 0.05 %. Similarly to the rice moisture comparison, differences in the correction value for the paddy moisture measurement range from 0.08 % to 0.56 % with the combined comparison uncertainty of 0.38  % (\(\hbox {k} = 2)\), whereas the stability in moisture content of the paddy sample at NIMT was found to be within 0.12 %.

Keywords

Bilateral comparison Moisture content Quality assurance 

References

  1. 1.
    OIML R 59, Moisture Meters for Cereal Grains and Oilseeds (1984)Google Scholar
  2. 2.
    ISO 712, Cereals and Cereal Products—Determination of Moisture Content—Reference Method (2009)Google Scholar
  3. 3.
    ISO 7700-1, Checking the Performance of Moisture Meters in Use—Part 1: Moisture Meters for Cereals (2008)Google Scholar
  4. 4.
    S. Sungzikaw, W. Triarun, OIML Bull. LII, 5–12 (2011)Google Scholar
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    Working Group Quality Measurement on Agricultural Products, 2nd Draft of APLMF Guide Document on Rice Moisture Measurement (2016)Google Scholar
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    JCGM 100, Evaluation of Measurement Data—Guide to the Expression of Uncertainty in Measurement (2008)Google Scholar
  7. 7.
    ISO Guide 35, Reference Materials—General and Statistical Principles for Certification (2006)Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.National Institute of Metrology (Thailand)PathumthaniThailand
  2. 2.Central Bureau of Weights and MeasuresNonthaburiThailand

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