Moisture meter

A moisture meter comprising:

• a mass measurement unit configured to measure a mass of a specimen placed on a weighing dish;
• a heating chamber having the weighing dish placed inside and configured to open and close;
• a heating unit placed in the heating chamber and configured to heat the specimen;
• a control arithmetic unit configured to control the heating unit to heat the specimen until a change in mass of the specimen becomes not more than a predetermined threshold and calculate a moisture content of the specimen from the change in the mass of the specimen before and after heating;
• a timepiece configured to measure a heating time;
• and
• a storage unit,
• wherein the heating unit includes a heater,
• wherein the heating chamber includes a glass cover disposed between the specimen and the heater and the glass cover is in the form of a container covering the weighing dish,
• wherein the control arithmetic unit includes a standard substance measurement unit configured to measure a moisture content of a standard substance for inspection as the specimen and measure a heating time, and an abnormality diagnosis unit configured to diagnose presence or absence of an abnormality in the mass measurement unit by evaluating a measured moisture content with reference to a theoretical moisture content of the standard substance and to diagnose presence or absence of an abnormality in the heating unit by comparing a measured heating time of the standard substance with a predetermined time as a set heating time of the standard substance stored in the storage unit in advance,
• wherein the abnormality diagnosis unit determines that there is an abnormality in the heating unit when the measured heating time is longer than the predetermined time, and
• wherein the determined abnormality includes contamination on the glass cover, contamination on the heater, and a failure of the heater.