Grain Moisture Tester

Published:2011/9/3 22:39:00 Author:Ariel Wang | Keyword: Grain, Moisture | From:SeekIC

A, B are two measuring electrodes. As the resistance value of food is generally high.Even during the measurement electrode with high voltage of about 150V, the current between two electrodes is only less than 1μA.The value of the measurement should be amplified by IC1 Integrated operational amplifier 5G3140 and then it could be indicated by header M. The higher the grain moisture content, the greater the current between the electrodes A and B , the greater the value the meter indicates. The pulse oscillator is made up of IC2's Time-base circuit 555.It is stepped up by transformer T,commutated by the diode.Then it generates 150V high voltage for the measurement of the electrodes.



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