Valmet Valmet MCA, Инструкция по установке и эксплуатации, Страница: 37 / 66

The effect of a new consistency calibration
If a new consistency calibration is performed on Valmet
MCA by taking a new sample after temperature consist-
ency correction is determined, the measurement pro-
gram performs a level adjustment on the compensation
curve.
In the level adjustment the program sets the value
of the compensation curve to zero in the calibration
temperature, i.e. the effect of the compensation curve
is zero at the calibration temperature. If for example
you performed a new consistency calibration with a
sample that has a temperature of 45 °C, the program
would perform a level adjustement of -0.05% on the
compensation curve and the compensation curve would
appear as follows.
1 . 4 2 . 0 - 0 . 0 5
2 . 4 8 . 1 0 . 0 5
T e m p . M C A - L a b
Changing the correction
If after the correction there is still some amount of
temperature dependency evident, you can most easily
perform the correction by editing the existing points. In
this case the size of the desired correction iss added
to existing correction values.
If, for example, after the temperature compensation
performed above and the new consistency calibration
the results appeared as shown in Figure 2. The correc-
tion value for 42°C would be increased by 0.03% and
the correction value for 48.1°C would be decreased by
0.02 %, after which the correction would appear as
follows:
Temp MCA-Lab
1. 42.0 C -0.02 %
2. 48.1 C 0.03 %
MCA-Lab vs Temp
-0,2
-0,15
-0,1
-0,05
0
0,05
0,1
0,15
0,2
41 42 43 44 45 46 47 48 49 50
Temp (°C)
M
C
A
-L
a
b
(%
)
Fig. 2. Results of new consistency calibration.
Installation & Owner’s manual OUL00298 V2.3 EN 37 Valmet Mircowave Consistency Transmitter