Res. Agr. Eng., 2025, 71(2):113-120 | DOI: 10.17221/15/2025-RAE

Portable analogue-based electronic moisture meter for root-crop chipsShort Communication

James Roy Lesidan ORCID...1, Mencius Lesidan ORCID...2, Melvin Hagonob ORCID...3, Charlie Andan ORCID...4,5, Ma. Grace Sumaria ORCID...6, Ronaldo Almencion6, Kebin Ysrael Martinez7
1 Department of Physics, College of Arts and Sciences, Visayas State University, Baybay City, Philippines
2 National Coconut Research Center – Visayas, Visayas State University, Baybay City, Philippines
3 Prairie Swine Research Inc., University of Saskatchewan, Saskatoon, Canada
4 Department of Meteorology, College of Engineering and Technology, Visayas State University, Baybay City, Philippines
5 Institute of Chemical Processes Fundamentals of Czech Academy of Sciences, Prague, Czech Republic
6 Department of Agricultural and Biosystems Engineering, College of Engineering and Technology, Visayas State University, Baybay City, Philippines
7 JE Hydro & Bio-Energy Corporation, Cebu City, Philippines

Moisture content regulation of root crops is crucial in post-harvest processing operations, not only in the price stipulation but also to avoid aflatoxin contamination. To prolong their storage life, they are processed into dried chips to extend their usability in feed formulations and starches. In this study, we use the capacitance-based method to evaluate the performance of an analogue-based electronic meter for the cassava, sweet potato, and taro chips. The meter was calibrated against the oven-drying method, yielding high R2 values of the different root crops. The established calibration models were validated and revealed high R2 values with 0.9580 for the cassava, 0.9958 for the sweet potato, and 0.9798 for the taro. The trendline equations are y = 59.44x0.56, y = 54.38x0.47, and y = 52.94x0.62, respectively. The results revealed that the moisture meter is capable of reading the moisture content on a weight basis (% MCwb) with accuracy and reliability at specified limits of 8% < x < 69% for the cassava, 15% < x < 59% for the sweet potato, and 9% < x < 57% for the taro. This study presents the performance of a portable analogue-based moisture meter as a reliable and accessible solution to small-scale operations, especially for farmers, offering an on-site rapid moisture content measurement in root crop processing.

Keywords: capacitance-based; moisture content; root crop processing; dielectric property; regression analysis; post-harvest technology

Received: January 28, 2025; Accepted: April 2, 2025; Prepublished online: May 5, 2025; Published: June 18, 2025  Show citation

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Lesidan JR, Lesidan M, Hagonob M, Andan C, Grace Sumaria M, Almencion R, Ysrael Martinez K. Portable analogue-based electronic moisture meter for root-crop chips. Res. Agr. Eng. 2025;71(2):113-120. doi: 10.17221/15/2025-RAE.
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