Hydronix Moisture Sensors

Digital microwave moisture measurement is recognised today as one of the most important methods for online measurement of bulk materials. Hydronix has a range of sensors that utilise digital techniques for measuring the change in a microwave resonator frequency with changes of moisture in the material. This type of sensor has very significant benefits over existing analogue techniques. Possibly the most important factor is that this technique provides a greater accuracy of measurement over a far wider range of moisture contents, and is suitable for working with a far wider range of materials.

Digital Measurement Technique

Hydronix microwave moisture sensors use our own unique digital measurement technique which measures multiple material parameters. These parameters are then precisely combined using a variety of advanced algorithms to deliver the optimum performance for a given application. This technology enables the sensors to be easily configured for peak performance in any material giving a linear response to changes in moisture.

Digital Signal Processing Filters

Digital microwave sensors have on-board electronics that allow measurements to be immediately processed and have noise reduction filtering applied to generate a stable output reflecting the moisture content of the material to plant operators or automated controls.  Normally, filtering has the side effect of reducing the responsiveness of the sensor output to changes in the moisture content. However, Hydronix technology allows for the use of advanced Digital Signal Processing (DSP) filters for faster response times to changes in moisture content whilst retaining the same level of noise reduction.

Choice of Measurement Modes

Hydronix sensors have the ability to use different measurement modes to achieve the best signal response to different materials. In the concrete industry for example, different aggregates have their own distinct dielectric property behaviour and will therefore respond differently to each of the underlying measurement modes. These response differences between the modes are also applicable to variables in the application itself. The best mode may now be selected for the material and the application to best account for the temperature range, precision required and bulk density changes over time.

Variable Frequency Technique

Hydronix sensor design starts and finishes with performance as the key design objective. The variable frequency technique is designed to operate in a bespoke range as opposed to an off-the-shelf frequency such as 433MHz or 2.4GHz. This ensures that the sensor is continually focused on detecting changes in the number of water molecules in the material with no interference from temperature changes and variations in the ionic content of the material (commonly salt content).