K-Patents SeedMaster 2 - Manual (Page 16)

3 THE SEEDMASTER 2 CRYSTALLIZATION TRANSMITTER … 16
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Data base
START On-line inputs
program once Parameters
every 10 sec Digital I/O
Calculated outputs
Archive data
Strike
ACTIVE?
ACTIVE YES STAND-BY
MODE MODE
Calculations operations
Archive END
data
Seeding
operations
Decision based on
THIRD INPUT
MASS. DENSITY MASS. SOLIDS CONT. MOTOR CONS. LAB. CR. CONT.
Calculations Calculations Calculations Calculations
END
Fig. 3.4 The basic SeedMaster 2 operations
Based on the calculated data SeedMaster 2 can be programmed to carry out automatic seeding of the
crystallizer on its own, when
•
supersaturation, or
•
massecuite density
becomes equal to the supersaturation or density set-point selected by the technologist or pan operator.
Actual seeding is carried out by opening the seed valve (digital output) for a pre-set time interval.
If seeding of the crystallizer is carried out not by SeedMaster 2, but by another device (a control system, for
example), or by the operator, SeedMaster 2 must be notified accordingly by a digital input, or via digital
communication.
All operations discussed above can be performed independently with two crystallizers at the same time.
3.4 Calculated data
Based on the information received SeedMaster 2 carries out involved calculations on-line. These, and one or
the other of the measured data used (density, solids content, motor consumption, or laboratory crystal
content data) are combined providing information on 7 massecuite parameters (set of massecuite
parameters) per crystallizer. These are: