K-Patents SeedMaster 2 - Manual (Page 48)

7 CONFIGURE SeedMaster 2 48
48
AVERAGE SUPERSAT. 1< VALUE From seeding to the end of strike. After the
1
st
strike average supersaturation during the
the last strike can be accessed by going to
DISPLAY -> TEST - > OTHER DATA, or use
the STRIKE HISTORY screen.
FEED SYRUP PURITY 55 – 100 % It must be specified in Set up -> Inputs,
and can not be entered or modified here.
BIAS CR. CONT. - 5…+ 5 % Crystal content bias in % (by volume).
Effective only above 46 %. Can be used
to adjust calculated data to the final crystal
content data determined by the laboratory,
MOTOR CAL. PARAM. 0 - 100 The “Motor calibration parameter” will be
automatically recalculated whenever motor
consumption, concentration, or temperature
data are changed. Though it is possible to
enter manual data, it is advised to use the
data calculated by SeedMaster 2.
CRYST. PARAMETER 0 – 1,5 The “Crystallization parameter” will be auto-
matically recalculated if parameters governing
crystallization are changed. Though it is
possible to enter manual data, it is advised to
use the data calculated by SeedMaster 2.
This parameter might be slightly modified by
the SeedMaster 2 program itself from strike to
strike (adaptation).
MOTOR: DOUBLE SPEED (HIGH followed by LOW SPEED operation, see Fig. 7.8)
If right at the beginning DOUBLE SPEED was selected for the motor, the procedure will be very similar. The
only exception: instead of parameters valid at PH. 1 END, when single speed was selected, the same
parameters valid at PH. 2 START should be used.
NOTES:
Most of the parameters listed above are self-explanatory. Some of them, however, need further explanation.
In this case PHASE 1 means the part of crystallization when the motor is not used as a sensor. Calculated
data are based on crystal growth simulation.
CR. CONT. (PH. 2 START): This is the crystal content just after changing the motor speed to LOW. It should
be determined by the laboratory.
CRYSTAL CONTENT data (% by volume) should be determined by the laboratory.
MOTOR CONSUMPTION data in different points of crystallization: these data can be easily determined by
using the DISPLAY -> TREND -> THIRD INPUT (MOTOR CONSUMPTION) trend of a strike. It is advised
to check and modify consumption data when starting a new campaign, or doing maintenance work on the
drive chain of the stirrer.
CONCENTRATION and TEMPERATURE data in different points are displayed on the refractometer LCD, or
their trends can be used.
LENGTH OF CRYSTALLIZATION TIME and AVERAGE SUPERSATURATION (from seeding till the end of
the strike) can be determined or estimated several ways: use their trend curves, go to DISPLAY-> TEST -
> OTHER DATA or to STRIKE HISTORY.
IMPORTANT:
It is important that the parameters should be determined based on data of the same strike. It is
advised to do a complete check of the parameters at least once at the start of a new campaign. Once
entered, only changing data (for example: feed syrup purity, crystal size etc.) should be modified.
This will result in the automatic recalculation of the CRYSTALLIZATION and / or MOTOR
CALIBRATION PARAMETER.
7.4.3 Third input: CRYSTAL CONTENT (laboratory)
The SeedMaster 2 software contains an advanced crystal growth simulation program that can be used when
no on-line “Third input” data (massecuite density, solids content, or motor consumption) are available. In this
case occasional laboratory data on crystal content (% by volume) of the massecuite at the end of
crystallization / strike should be used.
Calculations of output data will be based in this case on the on-line measurement of
• syrup / mother liquor concentration,
• massecuite temperature, and
• occasional crystal content data determined by the laboratory.