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FP (E1.1) 03/2019 page 57/90
If the safety device has turned off the chamber, identifiable by the red alarm lamp (2a), lighting up,
proceed as follows:
• Disconnect the chamber from the power supply
• Have an expert examine and rectify the cause of the fault
• Release the safety device by pressing the reset button (2b)
• Start the chamber again as described in chap. 5
Setting:
To check the response temperature of the safety device, turn on the chamber and set the desired set-
point at the temperature controller.
The scale division from 1 to 10 corresponds to the temperature range from 30 °C up to 320 °C and
serves as a setting aid.
• Turn the control knob (2) of the safety device using a coin to its
end-stop (position 10) (chamber protection).
•
When the set point is reached, turn back the control knob (2) until
its trip point (turn it counter-clockwise).
•
The trip point is identifiable by the red alarm lamp (2a) lighting up;
the reset button (2b) pops out.
• The
optimum setting of the safety device is obtained by turning the
knob clockwise by approx. one graduation mark on the scale.
• Push the reset button (2b) in again.
Figure 9: Setting the safety
device class 2
The chamber is only active with the reset button (2b) pushed in.
When the safety device class 2 responds, the red alarm lamp (2a) illuminates, the reset button (2b) pops
out, and the chamber turns off permanently.
Check the safety device with every change of the set point value and readjust it if necessary.
Function check:
Check the temperature safety device class 2 at appropriate intervals for its functionality. It is
recommended that the authorized operating personnel should perform such a check, e.g., before starting
a longer work procedure.
14.2 Temperature safety device class 3.1 (DIN 12880) (option)
The temperature safety device class 3.1 acc. to DIN 12880:2007 protects the chamber, its environment
and the charging material from exceeding the maximum permissible temperature. In the event of a fault, it
limits the temperature inside the oven to the value set on the safety device.
Please observe the DGUV guidelines 213-850 on safe working in laboratories (formerly BGI/GUV-I 850-
0, BGR/GUV-R 120 or ZH 1/119, issued by the employers’ liability insurance association) (for Germany).
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