JULABO CF41 Cryo-Compact Circulators - Manual (Page 57)

Cryo-Compact Circulators
57
>SafeTemp:<
IntMax: and IntMin: Limit setting
Setting range: see working temperature range page 9
The limits IntMax and IntMin are only valid for external control. IntMax and
IntMin are used to limit the expected internal bath temperatures to any upper
and lower values. The temperature controller cannot exceed these limits even if
it would be required for reaching the temperature in the external system.
Consequently the external setpoint may thus not be reached.
Sense of a limit setting:

Protects the bath fluid from overheating.

Prevents an undesired alarm shut-down by the excess temperature
protection - >ALARM CODE 14<.
Set >IntMax:< to a value at least 5 °C below the >SafeTemp:< value.

Protects the pump motor from high viscosity of the bath fluid at low
temperatures.

For refrigerated Cryo-Compact Circulator s: Freezing protection when using
water as bath fluid.
Upper band: and Lower band: Band limit
The band limit is active for external control.
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
AreaUp
AreaDown
For the heat-up and cool-down phases
different settings to conform to the
requirements of the particular application
are possible.
Setting range: 0 ... 200 °C
Using Upper band and Lower band, the
difference between the temperatures in
the internal bath and the external system
can be limited to any maximum value for
the heat-up or the cool-down phase.
During the heat-up phase the difference value always adds to the actual
external temperature. During the cool-down phase, the difference value is
subtracted.
Sense of a band limit:

Ensures gentle heating for the objects requiring temperature application.

Protects glass reactors, for example, from thermal shock.

The IntMax: and IntMin: values are superordinated to this band limit.