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| Moisture measurement on mineral bulk
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The physical basic principle of NIR (near infrared), the solid matter moisture measurement, is based on the ability to get weakly bound water molecules to vibrate through electromagnetic waves. Free water absorbs electromagnetic energy at certain wavelengths (absorption bands). A generated light beam is partially absorbed and partially reflected at a photoresist, moist surface of the medium being measured. In case of translucent media to be measured, a third portion of the beam penetrates the medium to be measured. The absorbing portion of the radiation energy contains the information of the material moisture. |
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| But because other properties of the material also have an influence on the reflection behaviour of the surface, one or several comparison beams is/are also measured to suppress these disturbance variables. Measuring beams and comparison beam(s) are obtained with the help of suitable interference filters. A photosensor (detector) converts the light energy into an electrical signal. With most suppliers of these systems, the filters are mounted on a rotating filter wheel. The light beam of measuring and reference wavelength first contacts the medium to be measured and then the detector. But because normally the medium to be measured is also transported, both light beams do not hit the same spot on the material. This may result in more or less large inaccuracies. In our systems described in the following, the filter wheel technology is replaced by the "same spot" measurement. In these systems, the measuring and reference wavelengths hit the same material spot and thus improve the results. In addition, a separate detector is provided for each wavelength. The detector and its electromagnetic circuit are adapted to the wavelength to be measured. The light source is modulated to be independent of external light. High-quality lock-in amplifiers process the signals of the detectors accurate to frequency and phase. Depending on the selection of the filters, other substances contained such as fat and protein can also be measured apart from the moisture; in case of two-dimensional products also the coating and the film thickness. | |||||||||||||||
| UR-5500 LED
Professional moisture measurement in the bulk industy |
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For the contactless moisture measurement of bulk industry´s products. Places of installation can be found in nearly every division of our industries. It´s main focus is the use in the ceramics indutry on conveyor belts, mixers, rotary screen feeders and sprinkling towers. |
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| Control and evaluation units for the ceramics industry
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| Measuring and control systems planned according to the relevant application and customer specifications. Visualised or alphanumerically as wall or desktop devices, or also for installation in already existing control cabinets. |  |
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