7. Detailed Description
Accurate Setting of Temperature Limit
If a more accurate temperature limit is required, for example 50 °C, follow the procedure below.
1.Set the temperature limit switch to its highest value.
2.Set the working temperature to 50 °C according to Section 4.4.
3.Run the unit and wait until it reaches exactly 50 °C.
4.Turn the temperature limit dial very slowly anticlock- wise (temperature down) until the safety circuit is trigge- red and the display indicates a malfunction.
5.Change the working temperature setting to any value lower than 50 °C.
6.Wait until the bath liquid has cooled down to below 50 °C.
7.Press the reset key.
The circulator can now be used for temperatures up to
50 °C. As soon as 50 °C is reached, the unit switches off.
Protecting the pump motor
When the temperature in the winding of the pump motor reaches a certain level, the general
. After the winding of the pump has cooled
down, the following code 
is displayed.
Check the pump and wait a few minutes until the motor tem- perature has dropped further before restarting the unit.
If this fault happens frequently, contact service personnel.
Sensor check
The temperature sensor is permanently monitored. The gene- ral
indicated by
.
19
