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FED (E2) 03/2019 page 29/57
1. Turn the control knob (7) of the safety device using a coin to its
end-stop (position 10) (chamber protection).
2. When the set point is reached, turn back the control knob (7) until
its trip point (turn it counter-clockwise).
3. The trip point is identifiable by the red alarm lamp (7a) lighting up;
the reset button (7b) pops out.
With the option audible alarm and the buzzer activated (chap.
7.3), the buzzer sounds as an additional signal. You can turn it off
with switch (11).
4. The optimum setting of the safety device is obtained by turning
the control knob clockwise by approx. one graduation mark on the
scale.
5. Push the reset button (7b) in again.
The chamber is only active with the reset button (7b) pushed in.
When the safety device class 2 responds, the red alarm lamp (7a) lights up, the reset button (7b) pops
out, and the chamber turns off permanently.
Check the setting regularly and adjust it following any changes of the set-point.
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.
7.2 Temperature safety device class 3.1 (DIN 12880) (option)
The temperature safety device class 3.1 serves to protect the chamber, its environment, and the charging
material from exceeding the maximum permissible temperature.
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).
Figure 7: Temperature safety device class 3.1
Function:
The temperature safety device is functionally and electrically independent of the temperature control
system and if an error occurs it performs a regulatory function. If you turn the control knob (7) to its end-
stop (position 10), the safety device class 3.1 protects the chamber. If you set it to a temperature a little
above the controller’s set-point temperature, it protects the charging material.
(7)
(7a)
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