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2-point calibration:
In a 2-point calibration, two material samples of different moisture content are measured and a linear
equation (f(x)=mx+b) is then calculated from this information. While a higher-value polynomial is
useful to achieve better accuracy, the linear equation often suffices, particularly in the lower moisture
range, and delivers very good results.
NOTE:
You require two material samples with different moisture values to perform a 2-point ma-
terial calibration. The moisture values must be determined with another method (weigh-
ing and drying, or similar) before the calibration. Make sure to adhere to the following
sequence: first "lower moisture value" (drier material) and then "upper moisture value"
(wetter material).
Procedure:
Page 20
At the start of the calibration, the calibration memory
(01 – 15) to be overwritten must be selected with the
"Up"
and "Down"
accept the setting.
Then set the percentage moisture of the lower moisture
value using the "Up"
the "Measure" key
To start measuring the material, press the "Measure" key
again. Four measurements are taken to increase the accu-
racy. An average of these measurement values is then cal-
culated. The measuring time is approximately 20 seconds.
When the measurement is finished, the measured pulse
transit time is displayed briefly.
NOTE:
Before you start measuring, make sure that the
rods of the probes are fully immersed in the ma-
terial to be measured. The probe must remain in
the material for the entire duration of the meas-
urement and should not be moved.
Then set the percentage moisture of the upper moisture
value using the "Up"
the "Measure" key
MMP20 SONO Mobil HD2 (option E)
keys. Press the "Measure" key
and "Down"
keys, and again press
to confirm your entries.
and "Down"
keys, and again press
to confirm your entries.
Endress+Hauser
to
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