BD / BF / ED / FD / FED (E3.1) 02/2022 page 36/116
7. Overtemperature protection
7.1 Overtemperature protective device (class 1)
The chambers are regularly equipped with an overtemperature protective device (safety device class 1 acc.
to DIN 12880:2007). It serves to protect the chamber, its environment and the contents against exceeding
the maximum permissible temperature. When a defined temperature is reached, which is approx. by 20 °C
to 30 °C above the chamber’s nominal temperature, the overtemperature protective device turns off the
heating.
Cut-off temperature values:
BD, BF: 120 °C
ED 260, ED 720: 320 °C
ED 56, ED 115, FD 56, FED 56: 330 °C
FD 115, FD 260, FD 720, FED 115, FED 260, FED 720: 350 °C
The message “Overtemperature” is displayed on the controller.
If the overtemperature protective device class 1 has turned off the heating, proceed as follows:
• Disconnect the chamber from the power supply for at least 10 seconds (pull the power plug).
• If appropriate, have an expert examine and rectify the cause of the fault.
• Let the chamber cool down
• Restart the chamber.
As soon as the inner chamber temperature after restart is below the defined cut-off temperature of the
overtemperature protective device class 1, the alarm message is deleted automatically.
Reset temperature values:
BD, BF: 90 °C
ED 260, ED 720: 220 °C
ED 56, ED 115, FD 56, FED 56: 230 °C
FD 115, FD 260, FD 720, FED 115, FED 260, FED 720: 250 °C
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