kajaaniMCA
i
– Installation, Operating & Service - 12.4 - W4610201 V2.5 EN
MCAi: MCAI-000
Select:
1
2
Latest Sample
Calibr in use
ABORT ENTER
Fig. 12.6. Menu for entering the laboratory values.
Entering laboratory values
When the laboratory analyses are ready, select CALIBRA-
TION => LAB RESULTS and the display shown in Fig. 12.6
will appear.
The MCAi stores the latest measured sample results
in the L
ATEST SAMPLE table. Select this menu item with
the cursor and press ENTER; the MCAi will ask for the
laboratory value of the latest sample. Enter the value
and press ENTER. Next the device asks for the filler
content; give the value as a percentage of the total
consistency. This reading does not have to be an exact
laboratory value, an estimate with 5% accuracy is
sufficient. If a value other than zero was entered, the
device will next ask for the relative amounts of filler
components (kaolin, calcium carbonate, talc, titanium
dioxide). Their sum must be 100%; if not, the display
shows a warning and the calibration will not be saved.
If this occurs, type the calibration values again in the
L
ATEST SAMPLE menu. If the filler content is given as
zero, the components are not needed.
Press OK to accept the displayed messages, and the
HART communicator will send the configured data to
the MCA
i
sensor.
Correcting the calibration
If the first calibration is inaccurate for some reason,
laboratory follow-up will show a continuous level
difference between the sensor and laboratory results. To
remove this level difference, the best way is not to take
a new sample and enter its lab. value using the C
ALIBRA-
TION => LAB RESULTS => LATEST SAMPLE menu, as in this
case the calibration would again rely on only one
sample point and the results from laboratory follow-up
could not be utilized. Instead, the preferred method is to
perform level correction in the C
ALIBR IN USE menu.
Example: if the MCAi steadily shows about 0.2%
higher consistency than laboratory, correct as follows:
Select C
ALIBRATION => LAB RESULTS and then select
function C
ALIBR IN USE to display the laboratory value of
the currently valid calibration. Correct the level differ-
ence by deducting from the laboratory value the MCA
i
’s
“excessive” 0.2%. Press OK to accept the existing filler
content value, and the HART communicator will send
the data to the MCA
i
sensor. The sensor will then
correct its consistency level by 0.2%.
Changing the filler content
Changes in filler content can also be set using the
C
ALIBR IN USE display. This may be necessary if the total
filler content changes by more than 5%.
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