MIKSTER
MIKSTER
Pasterisation
Governor diagrams
R
R
12
13
Due to frequent application of INDU50 controller as a unit controlling the process of thermal food
processing, its properties were widened by the possibility of counting the pasterisation number according to
the aritmetric variant of the general method.
The following sterilisation coefficients were applied: (z = 4.8K; z = 7.78K; z = 10K; z = 15K; z = 25K;
z=33,34K – set in Setup; Setup cell SF80) for the process temperature Tr also set in Setup SF77. There is a
possibility of performing the process either on the bases of the set value of the pasterisation number only
(Setup SF76), or on the bases of the set value of pasterisation number and the process time.
In the second case the parametrisation of maximum process time can constitute additional protection of the
production process correctness. Setting of the adequate integration time, which means the time between
consecutive moments of counting pasterisation number (setup cell SF79),
was also taken into account in INDU50 controller.
The possibility of determining the temperature, from which the controller should start counting the
pasterisation number (Setup SF81) was also added.
In order to utilise INDU50 controller for counting the pasterisation number the Setup cell SF45 - condition
of ending START mode - should be set on 19 or 20. The pasterisation number is determined in Setup SF76.
Description of parameters
Tza – temperature of governor activation; Output is controlled up to this temperature (warming). When this
temperature is reached the algorithm of regulation begins.
Dout – state on digital output (high state means that heaters are switched on).
t- time
GOVERNORS OPERATION
t
Tz
Temp.
Tza
Dout
Temp.
Governor - simple histeresis
Governor - reversed histeresis
low histeresis
high histeresis
low histeresis
high histeresis
Tz
t
Temp.
Governorr PID
t
Indu-50 version: 1.4
Indu-50 version: 1.4