Abstract—A frequency-based capacitance type grain probe
moisture meter was developed, as a low-cost alternative tool for
accurate and rapid moisture content measurement of paddy
grains in bags. The prototype unit consisted of a standard grain
probe; a 100-gram capacity test chamber; a grain selector panel
for overall control and measurement; and a handle for ease of
sampling. Calibration models between frequency and dry oven
method moisture contents were established and validated with a
relatively high coefficient of determination (R2) of 0.94.
Laboratory and actual field testing conducted between moisture
content readings of grain probe moisture meter and standard
reference oven method resulted to mean absolute error of 0.24.
Likewise, field testing results conducted revealed a mean
percentage error of 3.9 percent, an indication of a highly
acceptable level of accuracy based on standards set by the
National Institute of Standard and Technology (NIST) and
United States Department of Agriculture – Grain Inspection,
Packers and Stockyards Administration (USDA-GIPSA). Initial
fabrication cost of the prototype unit grain probe moisture
meter was approximately US$ 100.00 which is very competitive
with existing imported popular brands of grain moisture meters
with investment cost ranging from US$ 750.00 to above
US$ 4,000.00 The prototype unit grain probe moisture meter
has the advantage of simultaneously performing grain sampling
and moisture content determination. Likewise, the grain probe
meter can potentially save time and effort in moisture
assessment and most importantly ensure the procurement of
quality grains, ease in MC monitoring of stocks during storage
and MC validation before storage and milling.
Index Terms—Capacitance, frequency-based, moisture, meter, paddy.
The authors are with the Agricultural Mechanization Division (AMD) of the Philippine Center for Postharvest Development and Mechanization (PHilMech). Philippine (e-mail: firstname.lastname@example.org).
Cite: Arlene C. Joaquin, Maria Elizabeth V. Ramos, and Romualdo C. Martinez, "Development and Performance Evaluation of a Grain Probe Moisture Meter for Paddy," International Journal of Environmental Science and Development vol. 10, no. 10, pp. 350-355, 2019.Copyright © 2019 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).