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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 cut-off will be activated.
This protection prevents the motor from overheating. The
following error message will be displayed.
. 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 cut-off is activated if sensor breakage or current leakage is
detected. This fault is
indicated by .
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