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Selection and computation of optimum frequencies for double-parameter grain moisture meters

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Measurement Techniques Aims and scope

Conclusions

The principle described above for selecting and computing optimum frequencies for double-parameter moisture-content meters can be applied to materials with disturbing parameters which are not accessible for direct measurements, such as the density of a grain and air mixture.

On the basis of the derived condition (8) it has been shown that for a continuous testing of moisture content in grain with the elimination of the disturbing density parameter it is advisable to operate at frequencies of 20 kHz, which is the most sensitive to moisture changes, and at 5–10 MHz, which are the most sensitive to density variations.

In this connection it should be noted that in single-frequency testing of moisture content in grain freely poured into a transducer, or in testing flowing grain, the errors due to density changes are smaller at the lower frequencies up to 250 kHz.

On the basis of experimental data (see Fig. 4) it can be easily shown that in using a double-frequency method for evaluating moisture content in grain freely poured into a transducer, or in flowing grain, the measurement error amounts to ±0.25% of the absolute moisture-content value.

The above technique can be applied to other types of bulk materials which are suitable for frequency separation (9).

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Authors
  1. V. G. Pustynnikov
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  2. V. V. Dzhemella
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Pustynnikov, V.G., Dzhemella, V.V. Selection and computation of optimum frequencies for double-parameter grain moisture meters. Meas Tech 9, 391–396 (1966). https://doi.org/10.1007/BF00975835

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