On-line type moisture measuring system for powdered or granular materials

摘要

An on-line type moisture measuring system for powdered or granular materials wherein the moisture content of the materials is repeatedly measured by supplying a dehumidified and dried air each time the materials are sampled for measuring and thereafter automatically discharged. The system is comprised of a combination of sampling means and a moisture measuring apparatus. The sampling means samples a fixed amount of the materials from a material storage container and pneumatically transports the sampled materials. The moisture measuring apparatus includes dehumidified and dried air supply means for heating, dehumidifying and supplying air, material weighing means for weighing the sampled materials, a vaporization treatment chamber having an airtight vaporizer with a heater in which the materials received in a sample boat are heated while the dehumidified and dried air is fed as a carrier gas, a moisture measuring chamber including a moisture meter for measuring the water quantity of the materials based on the reaction of a Karl Fischer reagent by receiving the vapor generated in the vaporizer together with the carrier gas, and an arithmetic operation unit for calculating the moisture content of the sampled materials based on the water quantity measured by the moisture measuring chamber and the weight value measured by the material measuring means.