Endress+Hauser Solitrend MMP42, Brief Operating Instructions

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Diagnostics and troubleshooting Solitrend MMP42
24 Hauser
8.4 Settings
8.4.1 Material calibration
Different calibrations are saved in the sensor depending on the intended application of the
sensor.
In the "Material calibration" menu item, the necessary calibration can be selected via the
optional remote display, depending on the application. In this way, one sensor can cover a
variety of applications.
It is also possible to perform your own calibrations and overwrite an existing calibration curve.
SD02333M remote display - description of operation and material calibration.
8.5 Special functions
Special functions that are available are described in the Operating Instructions pertaining to
the device.
9 Diagnostics and troubleshooting
9.1 Optimizing the material flow
For accurate measurement results, certain limits must be respected with regard to the
installation and environmental conditions, and the associated bulk density of the material
being measured. Furthermore, there must be a sufficiently thick layer of material covering the
sensor.
If the material flow is too fast, the level of material above the surface of the sensor can be too
low. A hopper chute with guide plates can concentrate and increase the level of material
above the sensor head. Ideally - particularly in the case of wet sand - the guide plates have a
PTFE coating so that no material can stick to them. The sensor requires a layer of material of
at least 60 mm (2.36 in). There are installations where the amount of material is too low or
too spread out to ensure sufficient material flow over the sensor. In such cases it may be
necessary to "concentrate" the material flow so that material accumulates above the sensor as
it flows. The diagram below shows an example of a possible unit where the material is
concentrated at the side of the sensor and above the sensor.