K-Patents SeedMaster 2 - Manual (Page 20)

3 THE SEEDMASTER 2 CRYSTALLIZATION TRANSMITTER … 20
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Set of massecuite parameters:
1. supersaturation (-)
2. massecuite density (kg / m3)
3. massecuite solids content (%)
4. crystal content (% by volume)
5. massecuite consistency (%)
6. mother liquor purity (%)
7. mean crystal size (mm)
Additional data:
8. syrup / mother liquor concentration (%)
9. stirrer motor consumption (if used) (kW, or A)
10. temperature (
˚C)
11. level (%)
3.7.2 Standard current outputs
SeedMaster 2 hardware provides 2 standard current (4 – 20 mA, or 0 – 20 mA, configurable) output channels
per crystallizer. Any 2 out of the possible 11 parameters can be selected for transmission.
3.8 Digital (ON / OFF) outputs
There are 2 digital outputs available per crystallizer (DO1, DO2). These are implemented by switching
transistors (open collector) capable to switch 0,1 A (DC) current at 40 VDC, max.. The outputs are protected
against overload and overvoltage.
3.8.1 “SEED WARNING” output DO1
It is common practice to have the operator (pan-man) prepare the seed material (slurry) in advance and later
carefully stirring it for homogenisation, and fill it in the seeding vessel when seeding of the pan approaches.
The “SEED WARNING” output is configurable according to a supersaturation or density limit, and when this
limit has been reached the DO1 output will be turned ON activating a lamp or horn in order to signal the
operator that it is time to fill the seed slurry in its vessel. Having completed seeding this output will be turned
OFF automatically.
Alternatively this output can serve a different purpose, too. For example: if the seeding vessel has its own
small, motor driven stirrer, this output can be used to turn this stirrer ON in advance to homogenise the slurry
already filled in it.
3.8.2 “SEEDING” output DO2
Actual seeding of the pan is carried out by turning the DO2 output ON and opening the seeding valve for a
selected Ton time interval (configurable). This output will be operated in 3 cases:
•
when AUTOMATIC SEEDING by SeedMaster 2 was configured,
•
when MANUAL SEEDING by using SeedMaster 2 was carried out by the operator, and
•
when it receives a command for seeding via input DIN2, or digital communication.
This same output can be used also when crystal footing is being used for seeding.
3.9 The man-machine interface
The man-machine interface of SeedMaster 2 consists of two main parts:
1.
Parameterization of the device is basically tailoring (customizing) it to the application, taking into
account local circumstances and preferences.
2. Operation of the device needs the built-in features of the different forms of data display, including
strike history, alarm and test data. Besides AUTOMATIC SEEDING it also provides a tool for MANUAL
SEEDING. Information on seeding details, strike
status and time are also displayed .