13
6
2
!
Excess Temperature Protection
29
14. Excess Temperature Protection
If one of the safety devices is triggered:
•
The fault cause is shown in the display 6
(see also chapter 15).
•
An acoustic signal is sounded
•
all voltage conducting unit components (the heating
element and pump motor) are switched off immediately
i.e. the safety circuit transfers the unit to a stable, safe
condition.
The fault cause must be identified and remedied.
After the fault has been eliminated the unit can be started
again by pressing the Reset key 2.
14.1
Excess temperature protection dial
It offers protection against dangers caused by an uncon-
trolled heating up of the heat transfer liquid above the de-
sired set temperature.
The cut-off temperature is adjusted with the excess temper-
ature setting dial 13.
Proper protection can only be guaranteed if the
cut-off point has been correctly set.
There are two main aims for correct setting:
•
Safety (primary importance):
Protection against ignition of the heat transfer liquid.
The cut-off point must be set at least 25
°
C below the
flash point of the bath liquid used.
•
Protection of the object to be temperature con-
trolled (secondary importance):
Additional protection, e.g. of a biological sample. The
cut-off point should be set as close as possible to the
desired temperature value.
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