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5.3 Measurement
These settings are required to operate the measurement.
5.3.1 Temperature compensation
SYSTEM / SENSOR / TEMP.COMPENSATION
The microwave signal is influenced by temperature changes of the medium. In
cause of this, the phase shift has to be temperature compensated. Therefore you
have to define a temperature reference
Tref
and the temperature coefficient
Tk
.
Generally for the reference temperature you should take an average temperature
over the whole process.
The temperature coefficient should be
Tk=
-1.5000e+00 at the beginning, later
this value can be adjusted if it is required.
In the sugar industry:
For the batch pans the
Tref
should be set at the seeding point.
The temperature coefficient for sugar products (juice, syrup, masse cuite…) we
usually
take
Tk
= +3,0000e+00
Starting from „
System
” main menu, select „
Sensor
” then „
Temperature
compensation
”. Select „
Temp. corr
” and switch from „
OFF
” to „
ON
” in order to
activate temperature compensation, confirm by "
OK
" button. Now select
„
reference temp
” and enter the chosen temperature and at last confirm by "
OK
"
button.
Finally enter
Tk
like above.
5.3.2 Start coefficients
SYSTEM / SENSOR / CALIBRATION / COEFFICIENTS
This measuring system needs to be calibrated according to the laboratory results.
For this procedure it is required to set start coefficients.
The coefficients
А
0
and
А
1
are the Offset and the slope of the following formula:
Y=A
1
X + A
0
X
- Compensated Phase shift
Y
- Measurement in the chosen physical unity.
А
0
and
А
1
define the measuring range. It can be calculated as following:
Upper end of the measuring range =
A0
Lower end of the measuring range =
(A1*360) +A0
