kajaaniMCA
i
– Installation, Operating & Service - 7.1 - W4610201 V2.5 EN
7. Calibration
The MCAi is calibrated using single-point calibration;
only one sample at some process consistency level is
needed. In addition, the laboratory consistency value of
the process sample is needed. The following sections
describe the first calibration after initial configuration
(see section 6.A).
7.A.1. Sample taking
MAIN MENU => TAKE SAMPLE.
Press [F1&F2] S
TART to begin calibration. The
software begins to collect measurement results, and the
data is also shown on the trend display. Take laboratory
samples for calibration at the same time: collect at least
three samples, and then press [F3&F4] to stop sam-
pling. The measured consistency, process temperature,
signal level, and average level of chemicals compensa-
tion will be shown on the screen.
For reliable calibration, the standard deviation of the
calibration results must be small. This can be verified
by looking at the trend graph while the measurement
results are being collected. The curve must not show
any large swings. If the measurement result deviation is
very large, the measurement must be repeated.
The MCAi always overwrites the previous sample
data, and thus only the latest sample remains in mem-
ory. The display (Fig. 7.1) contains the following data:
• Cs %: average measured consistency.
• Temp °C: average measured temperature.
• Std dev: standard deviation of the consistency
measurements; appears on the screen when the
sample is stopped.
• Mlev u: signal level (u).
• Chem c: average value of chemical compensation.
F7
F6
F5
F4
F8
F3
F1
F2
F9
F10
F11
F12
F13
F14
F15 F16
i
NOT SAMPLING
Press “Start” to start sampling
Cs % Temp °C Mlev u Chem c.
0.00 68.5 59.1 0.00
10.00
5.00
0.00
Start
Fig. 7.1. Starting the sampling.
7.A.2. Entering laboratory result
Go from MAIN MENU => ENTER LAB => LATEST SAMPLE.
When calibrating for the first time, the laboratory
result is always given in the “Latest sample” display
(Fig. 7.2). Press [F1&F2] E
DIT, type the laboratory
measurement result in the field “Lab”, and press [EN-
TER] to accept. If the measured stock contains fillers,
also give the average filler content and filler component
contents. Sufficient accuracy for the average filler
content is 5% so it can be evaluated (does not have to be
determined from a laboratory sample).
When all the required data have been entered, press
[F3&F4] S
AVE. The software will ask if the new calibra-
tion should be taken into use; reply YES to accept, or
NO to cancel (the old calibration will then be used). The
“Calibration in use” display will then appear, and the
values can be edited from this screen if necessary.
When the first calibration has been made, the L
ATEST
SAMPLE
button is no more available; new laboratory
values must be entered in the “Calibration in use”
display.
The display shown in Fig. 7.2 contains the following
data:
• Temp: temperature in the process.
• MCA: measured consistency.
• Lab: consistency measured in laboratory.
• Average filler content: given in per cent of the total
consistency. The different filler components are
given as percentages of the total fillers (their total
sum must be 100%).
7.A. First Calibration
F7
F6
F5
F4
F8
F3
F1
F2
F9
F10
F11
F12
F13
F14
F15 F16
i
LATEST SAMPLE
17.10.00 13:57
Temp = 68.5 °C MCA = 0.00 %
Lab = 0.00 %
Average filler content =
0.0 %
from which
Kaolin = 25.0 % Talc = 25.0 %
CaCO3 = 25.0 % TiO2 = 25.0 %
Edit
Fig. 7.2. “Latest sample” display.
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