The key problem in the determination of the total moisture of coal is to ensure that the moisture of the original coal sample does not lose or increase, that is, the moisture in the middling coal sample does not change during the whole process from sample preparation to testing. Therefore, the following issues must be paid attention to: the collected total moisture sample is stored in a well sealed container and placed in a cool place;

The sample making operation should be fast, and it is best to use a sealed crusher;

The coal sample for total moisture measurement should not be too fine. If a finer sample is needed for measurement, it should be measured using a sealed crusher or a two-step method - first break it into larger particles to measure its external moisture, and then break it into smaller particles to measure its internal moisture.