kajaaniMCA
i
– Installation, Operating & Service - 6.4 - W4610201 V2.5 EN
F7
F6
F5
F4
F8
F3
F1
F2
F9
F10
F11
F12
F13
F14
F15 F16
i
Fig. 6.8. Current output 3, chemical contents.
CURRENT OUTPUT 3: chem. contents
Low (4 mA) High (20 mA)
= -20.00 u = 20.00 u
Filtering Error situation:
= 1.0 s 20 mA
Conductivity of the consistency
calibration sample
18.10.00 10:17 = 0.00 mS/cm
Chemical = 0.00 u ... 12.00 mA
Edit
Enter conduct. Next
18.10.00
6.B.3. Scaling the current output for chemical con-
tent
MAIN MENU => CURRENT OUTPUT => NEXT => NEXT
(Current output 3, Fig. 6.8).
This output indicates variations in the chemicals
content of the pulp, based on the microwave signal level
measurement. When scaling this output, pay attention
to some differences between it and the other current
outputs.
Scale the chemicals output in such a way that the
chemical content measured at the time of calibration
corresponds to zero signal level units (0 u corresponds
to 12 mA). The current signal will then indicate directly
if the chemical content has increased or decreased in
comparison to the “calibration level” (decreased < 12
mA < increased). When scaling the output, also enter
the conductivity value of the consistency calibration
sample; this reading is needed to compensate for the
effect of temperature on the signal level.
If the conductivity of the Cs calibration sample is not
known, calibrate as follows:
1. Take a sample.
2. Determine its conductivity.
3. In the “Latest sample” display, enter the Cs reported
by the MCAi as the laboratory value.
This ensures that the Cs calibration remains un-
changed but the conductivity will be determined. See
section 7 for more detailed instructions.
Press [F1&F2] E
DIT to edit the output.
1. Enter the signal level corresponding to the low limit
(4mA).
2. Enter the signal level corresponding to the high limit
(20mA).
3. Enter the filtering time for the output (usually 1
second is suitable).
4. Press [F3&F4] S
AVE to save the changes.
5. Press [F3&F4] E
NTER CONDUCT, and give the con-
ductivity of the Cs calibration sample.
6. Press [F3&F4] S
AVE to save the changes.
NOTE: If required, the outputs 2 & 3 can be switched so
that current output 2 is scaled for chemical content,
output 3 for temperature. To do this, press NEXT =>
[F5&F6] TEMP -> CHEMICALS.
To Next Page
Loading...
Need help?
General