Commissioning
Solitrend MMP40
24
Hauser
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t
p
Cal12
Cal13 Cal8
Cal14
Cal15
Cal9
H %
A0037432
17
Linear calibration curves (Cal8, Cal9, Cal12, Cal13, Cal14, Cal15 )
H
Gravimetric moisture; %
tp
Radar transit time; picoseconds
Assignment of the calibration curve to the material to be measured
•
Cal8
: Lignite
•
Cal9
: Basic calibration
•
Cal12
: Sewage sludge
•
Cal13
: Cereals (linear)
•
Cal14
: Air/water 0 to 100 %
•
Cal15
: Raw data calibration (1/10 of Ø radar transit time)
The graphics show the linear calibration curves (Cal1 to Cal15) for various materials.
These curves are saved in the sensor and can be selected by the user. The gravimetric
moisture (H) is indicated on the y-axis, and the associated radar transit time (tp) in
picoseconds is displayed on the x-axis. This depends on the specific calibration curve. The
radar transit time is displayed simultaneously with the moisture value during moisture
measurement. In air, the sensors measure approx. 60 picoseconds radar transit time, and
1000 picoseconds in water.
8.4
Special functions
8.4.1
Determining the mineral concentration
With the radar-based measurement method, it is not only possible to measure moisture
but also to draw conclusions about the conductivity or mineral concentration. Here, the
device determines the attenuation of the radar pulse in the measured volume of a
material. This method delivers a characteristic value depending on the mineral
concentration. The conductivity measuring range of the sensors here is up to 20 mS/cm,
depending on the moisture content.
8.4.2
Material temperature measurement
The sensor contains an integrated temperature sensor, which determines the housing
temperature 3 mm below the surface of the sensor head. The temperature can optionally
be output at analog output 2. As the sensor electronics use approx. 3 W of power, the
sensor housing heats up slightly. Therefore a very precise measurement of the material
temperature is not possible, or is only possible to a certain degree.
Summary of Contents for Solitrend MMP40
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