Untitled - HUBER

unistat control V3.8.1
Nine tempering programs with 30 program segments each are available.
Each tempering program fundamentally consists of the program descriptor and up to
30 program segments. The following settings prevailing at the start of processing a
thermoregulation program will be adopted:
Tempering method (internal or external),
Minimum and maximum set points,
Inclusion of external control signals,
Use of potential free contact,
Use of automatic response to main power failure.
9.2 Program Descriptor
When a tempering process is planned there is a particular path it has to follow the program is
then set to follow this path exactly. The temperature ramps and temperature plateaux are
only part of an automated process. Additionally the following data is required for the program
descriptor at the start of the thermoregulation program. (See program 21).
Start time for the thermoregulation program:
The program start can take place immediately, or whenever you want. The setting for the
start temperature for the first segment takes place in the program descriptor.
A chosen ramp will start from the actual value to the starting temperature. If full power is
required, a high value, for example 20 K/min, has to be set.
Time or temperature stability for the tempering program:
The rule for every program segment is:
If the temperature at the end of the segment is to be checked the ‘temperature stability’
function should be selected. The next program segment will get started, when the actual
value reaches the end temperature of the program segment with fixed accuracy (+/- 1K).
If on completion of the segment time the actual temperature is not to be checked, the time
stable option should be selected.
If you work the tempering program with length ‘0’, details of the starting temperature,
starting ramp, or if it the temperature stable option will be requested. The programmer can
repeat the program segments.
9.3 Program Segments
Each program segment contains two values: The segment end temperature and the duration
of the segment. The starting temperature of the segment results automatically form the end
temperature of the previous segment. The duration of the segment is reduced constantly
during the program run. The next set point is therefore determined from the difference of the
end temperature and the actual value. At the end of a segment it will be checked, if
‘temperature stability’ (See 9.2) has been requested the end temperature is to be reached
with +/- 1K accuracy. If maintenance steps are necessary, the program run time of the
program is extended. The waiting time in the actual segment will be displayed as tw in the
LCD display.
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