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7.5 Setting the precision of a single value measurement cycle
The SONO probe can be adjusted to the precision of a single value measurement via
"Single Precise Parameters"
.
First of all, the more accurate the SONO probe has to measure, the longer the time required for a single value
measurement with a TDR radar pulse evaluation. There are applications where the SONO probe under a silo valve
has only 2 to 4 seconds to perform several measurements with average value building.
Here, a precise single value measurement would take too long, which is why the setting "Quick" with a short
measuring time of 280 ms is recommended. Especially since the fluctuating flow of material under a silo valve
cannot lead to constant conditions anyway in order to be able to carry out a highly precise individual measurement.
However, there are applications where it is necessary to achieve measuring accuracies up to + -0.05% moisture
content which is only possible with very constant material conditions. E.g. in liquids with fractions of water in oil
or in emulsions.
The following table provides an overview of the possible settings in the SONO probe for a single TDR radar pulse
evaluation.
Parameter Setting
Measure-Mode Function of the parameter
Application
Quick:
Mode C
e.g. CS, CH, CF,
etc.
Quick TDR pulse search and very
quick measurement within 280 ms.
e.g. under a silo flap with only
2-4 seconds measurement
time.
Quick Precise:
Mode C
e.g. CS, CH, CF,
etc.
Quick and precise TDR pulse search
and precise measurement within
350ms.
Similar to „Quick“ but with a
little longer reaction time in
process measurements.
Mode A:
Mode A
Mode A only with measurements via
serial interface of the sensor. E.g. for
calibrations.
Mode A for mobile moisture
probes with hand mea-
surement device HD2 or
SONO-DIS.
Precise:
PreciseVal:
Input value: 1…4
Mode C and
Mode A
Most precise single value measure-
ment with precise TDR radar pulse
triggering and pulse analysis. The
higher the value 1 to 4 the higher
the precision but the longer the
measurement time.
Only in process environment
where a continuously ma-
terial flow is guaranteed
and a very high precision is
necessary.
Single MeasNo
Default value: 4
Input value max. 10
Mode C and
Mode A
Additional averaging of the single
value measurement. Please consi-
der: when 10 is entered, one single
measurement can take up to one
second.
Only in process environ-
ment where a continuously
material flow is guaranteed
and a very high precision is
necessary.
7.6 Test run in the respective Measurement Mode
In the menu "Test" and the window "Test in Mode CA to CF" the measured moisture values “MoistAve” (Average)
of the SONO probe are displayed on the screen and can be parallel saved in a file. In the menu "Test" and the
window "Test in Mode CS" the measured single measurement values “Moist” (5 values per second) of the SONO
probe are displayed on the screen and parallel stored in a file. In „Test in Mode A“ single measurement values
(without average) are displayed on the screen and can also be stored in a file.
