Menu functions
72
9.8.2.
Limits for external control
>
SAFETMP <
INTERN MAX / MIN
Restriction for the temperature range of the internal bath.
Setting range: -94,9 °C ... +300,0 °C
The limits IntMax and IntMin are only active in external control. IntMax
and IntMin determine fixed limits for the temperature within the internal
bath. The temperature controller cannot exceed these limits even if it
would be necessary for achieving the temperature in an external system.
Therefore it is possible that the external setpoint cannot be achieved.
Sense of limit setting:
Protects the bath fluid from overheating.
Prevents an undesired alarm shutdown by the excess temperature
protection - >
ALARM CODE 14
<.
Set the value of > Int Max at least 5 °C below the value of
>SafeTemp<
.
Protects the pump motor from high viscosity of the bath fluid at low
temperatures.
For refrigerated circulators. Freezing protection when using water as
bath fluid.
Upper band:
and
Lower band
:
The band limitation is active during external control. Varied, practice-
oriented setting are feasible for heat-up and cool-down phases.
Setting range: 0 °C ... 200 °C
Upper band:
and
Lower band
allow for the limitation of the difference
between the temperatures in the internal bath and the external system to
any maximum value for the heat-up and cool-down phase.
During the heat-up phase this difference value is always added to the
actual external temperature. During the cool-down phase the difference
value is subtracted.
25
50
10 20 30 40 50 60 10 20 30 40 50 60 10 [min]
75
100
150
200
°C
t
external system
Internal bath
BAND HIGH
BAND LOW
Sense of a band limitation:
Protection of objects and samples
by gentle temperature control
Protection of e.g. glass reactors
from thermal shock.
