kajaaniMCA
i
– Installation, Operating & Service - 12.8 - W4610201 V2.5 EN
MCAi: MCAI-000
Chem. Compensation
1
2
3
4
HELP
Start Sample 1
Start Sample 2
Lab Results
Chem Comp.
SAVE HOME
OFF
Fig. 12.11. “Chemical compensation” display.
• Compensation with HART
When using the HART communicator, proceed as
follows: In the D
IAGNOSTICS menu select CHEM. COMPEN-
SATION with the cursor and then press the RIGHT arrow
key to display the menu shown in Fig. 12.11.
Use function C
HEM COMP to switch chemicals com-
pensation on and off.
• Entering laboratory values
Select DIAGNOSTICS => CHEM. COMP. => LAB RESULTS and
the display shown in Fig. 12.12 will appear.
Select function L
ATEST SAMPLE for the desired sam-
ple. MCAi will show the sample data and ask for
laboratory consistency. Type the laboratory Cs value
and press E
NTER. Also enter the laboratory conductivity
(note the unit: mS/cm), MCAi Cs, temperature, and
signal level.
If the samples were taken using the function S
TART
SAMPLE 1/2, the MCAi measurement values (Cs, tem-
perature, signal level) are already there. Press OK to
accept them.
When entering values based on earlier laboratory
follow-up, select representative values for conductivi-
ty, temperature and signal level values from the plotted
(MCAi – Lab vs. signal level) graph, and choose the
MCAi and laboratory consistency values so that the
difference between them is correct. The absolute con-
sistency values are not significant.
When both of the calibration points have been sent
to the MCAi sensor, activate chemicals compensation
by function C
HEM COMP = ON.
• Sample taking
NOTE: Enter data on two sample points selected from
laboratory follow-up data, or take new calibration sam-
ples as described below.
In the chemicals compensation menu, select START
SAMPLE 1 or START SAMPLE 2. The display will read
“Sampling” and the MCAi begins averaging its mea-
surement result. Take at least three parallel calibration
samples. The press OK to stop sampling, and the
display will show the MCAi measurement results:
consistency (A
VERAGE) and its DEVIATION, TEMPERA-
TURE, SIGNAL LEVEL, and the current chemical compen-
sation value (C
HEM COMP). Press OK to accept. The
results will be saved in the chemicals compensation
table L
AB RESULTS => LATEST SAMPLE and wait for the
laboratory values of consistency and conductivity. When
the chemical content of the process has changed, repeat
this procedure for the second calibration sample.
NOTE: Do not change the consistency calibration while
performing the chemicals compensation!
If the consistency calibration is changed before the
second chemicals compensation sample has been tak-
en, the MCAi will delete the data on the first sample!
MCAi: MCAI-000
Select:
1
2
3
4
Latest Sample 1
Latest Sample 2
Cal. in Use 1
Cal. in Use 2
ABORT
ENTER
Fig. 12.12. Entering laboratory values.
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