Meaning
Rapid moisture determination systems use the absorption of electromagnetic radiation to calculate the water content in bulk materials. Utilizing microwave moisture analysis allows for instantaneous readings that can be taken while material is moving on a conveyor or through a pipe. The technique is effective because water molecules are polar and rotate rapidly when exposed to a microwave field, absorbing energy in the process.
This energy loss is then calibrated to a specific moisture percentage.
Dielectric Constant
Every material has a unique ability to store electrical energy, which is measured as its dielectric property. In microwave moisture analysis, the presence of water significantly increases the dielectric constant of the mixture. This difference allows the sensor to detect moisture even when it is buried deep inside a large volume of material.
Signal Stability
High-quality sensors account for changes in temperature and density to ensure a consistent reading. Because microwave moisture analysis is non-destructive, it does not alter the sample or slow down production. The signal passes through the entire cross-section of the product, providing a more representative result than surface-only methods.
Data Integrity
Automated calibration routines compare the sensor output against laboratory primary standards like oven drying. Using microwave moisture analysis provides a continuous stream of data that can be used for closed-loop control of industrial dryers. This reduces the risk of shipping out-of-specification products due to sampling errors.
