User Manual
SONO-MIX MINI Version 2_7
2017-05-12
Page 10
Invalid Measure Count
Standard Setting: 2 values
Setting Range: 0
….. 10
Unit: Measurement Values
with 3 single values per second.
CA/CF/CK:
inactive
CC/CH:
Number of discarded (poor) measurement values after
the start of a new batch, when
„
No-Material-Delay
“ has triggered.
The first measurement values will be rejected, e.g. due to dripping
water.
Moisture Std. Deviation Count
Standard Setting: 5 values
Setting Range: 0
….. 20
Unit: Measurement Values
with 3 single values per second.
CA/CC/CF/CH/CK:
If the parameters Temperature or EC-TRIME
(RbC) are not needed, the analogue output 2 can be setted tot he
mode
Moist/Moist Std. Deviation.
In this mode the standard
deviation of all single moisture values can be outputted. With this
function the homogeneity of the single measurement values can
be determined and it is possible to control a regulating process,
e.g. pressure regulation.
Quick und Quick-Precision
With Meas Time (no. values)
Unit: without unit!
CA/CC/CF/CH/CK/CS:
Recommended is
Quick Precision
with
Meas Time=2
where the TDR pulse is detected precisely. For still
a little better accuracies, Meas Time can be increased, however
the single measurement cycle is increased by 60 milliseconds per
step (e.g. from 280ms to 340ms). Older SONO probe versions do
not have this Quick Precision function!
2.1.1.
Average Time
in the measurement mode CA and CF
SONO probes establishes every 200 milliseconds a new single measurement value which is
incorporated into the continual averaging and issues the respective average value in this timing cycle at
the analogue output. The averaging time therefore accords to the “memory” of the SONO probe. The
longer this time is selected, the more inert is the reaction rate, if differently moist material passes the
probe. A longer averaging time results in a more stable measurement value. This should in particular be
taken into consideration, if the SONO probe is deployed in different applications in order to compensate
measurement value variations due to differently moist materials.
At the point of time of delivery, the
Average Time
is set to 4 seconds. This value has proven itself to be
useful for many types of applications. At applications which require a faster reaction rate, a smaller
value can be set. Should the display be too “unstable”, it is recommended to select a higher value.
2.1.2. Filtering at material gaps in mode CA and CF
A SONO probe is able to identify, if temporarily no or less material is at the probe head and can filter out
such inaccurate measurement values
(
Filter-Lower-Limit)
. Particular attention should be directed at
those time periods in which the measurement area of the probe is only partially filled with material for a
longer time, i.e. the material (sand) temporarily no longer completely covers the probe head. During
these periods (
Lower-Limit-Keep-Time
)
, the probe would establish a value that is too low. The
Lower-
Limit-Keep-Time
sets the maximum possible time where the probe could determine inaccurate (too
low) measurement values.
Furthermore, the passing or wiping of the probe head with metal blades or wipers can lead to the
establishment of too high measurement values (
Filter-Upper-Limit)
. The
Upper-Limit-Keep-Time
sets
the maximum possible time where the probe would determine inaccurate (too high) measurement
values.
Using a complex algorithm, SONO probes are able to filter out such faulty individual measurement
values. The standard settings in the
Measurement Mode CA and CF
for the filter functions depicted in
the following have proven themselves to be useful for many applications and should only be altered for
special applications.
It is appropriate to bridge material gaps in mode CA with Upper- and Lower-Limit Offsets and Keep-
Time. For example the Lower-Limit Offset could be adjusted with 2% with a Lower-Limit Keep-Time of 5
seconds. If the SONO probe determines a moisture value which is 2% below the average moisture
value with e.g. 8%, than the average moisture value will be frozen at this value during the Lower-Limit
Keep-Time of 5 seconds. In this way the material gap can be bridged. This powerful function inside the