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Development and Evaluation of a Low-Cost Probe-Type Instrument to Measure the Equilibrium Moisture Content of Grain

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Applied Engineering in Agriculture. 33(5): 619-627. (doi: 10.13031/aea.12266) @2017
Authors:   Paul R Armstrong, Samuel McNeil, Naomi Manu, Augustine Bosomtwe, James K Danso, Enoch Osekre, George Opit
Keywords:   Equilibrium moisture content, Grain storage, Maize, Moisture content, Moisture meter, Post-harvest


Storage of grain in bags is common in Africa, Asia, and many other less developed countries making a bag probing method well-suited for moisture content (MC) measurement. A low-cost meter was developed under a USAID project to reduce post-harvest loss (PHL). The meter, referred to as the PHL meter, measures the MC of maize and other grains based on relative humidity (RH) and temperature (T) measurements obtained by a small digital sensor located in the tip of a tubular probe that can be inserted into bags of grain or other grain bulks. Measurements are used by equilibrium moisture content (EMC) equations programmed into the meter to predict MC. A handheld reader connected to the probe provides a user interface.

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