Heraeus 6000 Serie Instrucciones De Uso página 52

Temperature limit
controller for excess
temperature
Thermal safety class 3.1
Protection of the incubator, its environment and
the load against inadmissible excess temperature.
Admissible only for non-dangerous loads.
Function:
The temperature limit controller is operationally and
electrically independent of the temperature control system.
In case of failure, it takes over the control function.
Temperature limit controller
When the control knob is set to the limit stop, the
temperature limit controller functions as incubator
protection. If the temperature limit controller is set to a
value somewhat higher than that selected on the controller,
it functions as load protection.
Once the temperature limit controller begins to function and
the red warning light comes on, proceed as follows:
1. Disconnect the incubator from the line.
2. Investigate and eliminate the cause of the failure.
3.Turn on the incubator again as described.
Setting:
To ascertain the temperature at which the temperature limit
controller operates, and thus to be able to adjust it properly,
the incubator must be put into operation. Set the control
knob to the limit stop (for protection of the incubator). After
the selected operating temperature has been reached,
reset the temperature limit controller to the switch point. If
the controiler comes into operation, the red warning lamp
lights up.
You'll find the optimum setting of the temperature limit
controller by turning back the control knob by approxi-
mately one graduation mark. The red warning lamp will go
out.
Operational test:
The temperature limit controller should, at reasonable
intervals, be tested for proper operation. It is recom-
mended that this test also be carried out routinely by the
authorized operating personnel, e.g. prior to the start of a
longer work process.
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