Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Measurement of Moisture Content in Granular Ammonium Phosphate by a Microwave Method [PDF]
AUTHORS	A. Kraszewski, S. Kuliński and K. Checiński 1974 9 4 361-372
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Abstract The attenuation of granular ammonium phosphate in a matched, X-band circular waveguide sensor was used to measure its moisture content. In a waveguide length of 250 mm the slope of the calibration curve (attenuation vs. moisture content) of above 12 dB/% , has been obtained. With high meter stability and the density of granular material nearly constant, this slope gives a measurement accuracy of about ± 0.10 % , in the range of 0.2 to 1.5 % . The measuring sensor, the properties of the material and sources of measurement error are discussed.