ABSTRACT
This chapter discusses methods for the measurement of moisture content of powders. Powder properties such as the angle of friction or the flowability of powder depend on the moisture content of the powder. The moisture content of some powders should be controlled so as to match storage conditions. In powder handling processes, drying is one of the most energy-consuming processes, and optimization of the system should be carried out to save energy. The optimization or automatic control of these processes requires continuous monitoring of moisture content in the powder materials. This chapter discusses the electrical methods. They are: electric capacitance method and electric resistance method. The electric resistance method is also called the electric conductance method. Electric resistance of a wet powder bed decreases with increasing moisture content. The chapter discusses the methods for measuring moisture content based on nuclear magnetic resonance, neutron reflection, cobalt chloride reaction, or equilibrium relative humidity.
