The microwave density meter is a measuring instrument that employs the microwave phase difference method. This instrument operates on the principle of capturing the change in a dielectric constant, etc. which originates in a change of density as the microwave propagation speed; that is, the phase difference. Among the advantages of this type of density meter compared with conventional density meters are its greater strength against adhering dirt and its excellent maintainability. It is widely used in such fields as sewage treatment, the pulp and paper industry, and the food industry, and its application to further fields is expected in the future.
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