BCs160VA
Nov. 15, 1997
SMART-PULP
Smart Consistency Transmitter
27
Figure 2.3.4
press arrow key to go to the previous options. If the
difference between the two samples is less than 25%
of the consistency level, the display blinks as a
warning of possible error. However, you can still
accept the calibration.
SAVE OK?
Press ENTER to accept the new calibration for the
selected recipe. If password is in use, you have to
enter and confirm the password.
The NO SAMP message indicates that no sample(s)
has been taken.
The CAL HI message warns of a suspiciously large
change in the basic calibration curve.
The REPEAT.CA message asks you to repeat the
sample taking, because the change in the basic
calibration curve would otherwise be unnatural (for
example, higher shear force would represent lower
consistency).P1<0.1 or >10 or P2>10 or <-10.
W CAL OUT is warning that the change in the basic
calibration curve was quite high, but new calibration
was accepted P1<0.5 or >1.5 or P2>1.0 or <-1.0.
2.3.4 The SP.GRADE menu
If the available pulp type curves in some special
cases are unsatisfactory even after two-point
calibration or if a new special sensor blade is used
with an older transmitter, the SPecial GRADE menu
offers you the chance to correct the curve of recipe
No. 1 through a max. 16-point offset table.
Through the table you enter the known consistency
offsets relative to the calibrated curve at the desired
consistency levels.
You apply the offset value of the table’s minimum
non-zero consistency level for consistencies below
the minimum table value.
You apply the offset value of the table’s maximum
consistency level for consistencies above the
maximum table value.
For consistencies between the table values you
apply linear interpolation of the offsets of the next
lower and next higher consistencies.
Figure 2.3.4 shows a calibration example. The order
in which you proceed is free.
NOTE! When executing single-point or two-point
calibration for recipe one, erase special grade table
first.
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
x
x
x
x
-0 .9
-1.2
-1.85
-2.6
7.9
6.1
4.3
3.05
F/N
%Cs
1
2
3
4
A
B
An example of calibration for special pulp type:
Selected basic curve A: Sensor RL, Pulp RCFS
Calibration curve corrected through 4 points: B
Table: Calibration points and correction need based on lab samples.
Point No. Consistency reading/%Cs Consistency offset/%Cs
1 3.05 -0.9
2 4.3 -1.2
3 6.1 -1.85
4 7.9 -2.6