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BD-S / BD-S-UL, ED-S / ED-S-UL, FD-S / FD-S-UL (E1) 10/2020 page 20/59
9.2 Safety controller
The chambers are regularly equipped with an adjustable electronic safety controller. It serves to protect
the chamber, its environment and the contents against 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).
Depending on the chamber type the safety controller acts as an over temperature safety device class 2
(“temperature limiter”) or class 3.1 (“temperature protection”) acc. to DIN 12880:2007.
Check the setting regularly and adjust it following any changes of the set-point.
• BD-S / BD-S-UL: Safety controller class 3.1
The safety controller class 3.1 limits the temperature inside the chamber to the entered safety control-
ler set-point. In the event of a fault (if this maximum temperature is exceeded), it takes over the control
to this value. This status is reported visually by an alarm message.
The safety controller keeps control of the chamber until the chamber temperature cools down below
the safety controller set-point value.
• ED-S / ED-S-UL, FD-S / FD-S-UL: Safety controller class 2
The safety controller class 2 limits the temperature inside the chamber to the entered safety controller
set-point. In the event of a fault (if this maximum temperature is exceeded) the safety controller com-
pletely turns off the heating until manual reset. This status is reported visually by an alarm message.
Function check:
Check the safety controller at appropriate intervals for its functionality. It is recommended that the author-
ized operating personnel should perform such a check, e.g., before starting a longer work procedure.
9.2.1 Setting the safety controller
A limit temperature is entered as the safety controller set-point , i.e. the absolute maximum permitted
temperature value.
BD-S / BD-S-UL: Setting with an accuracy of a tenth of a degree. 0 °C / 31 °F up to 80 °C / 176 °F
ED-S / ED-S-UL, FD-S / FD-S-UL: Setting with an accuracy one degree. 0 °C / 31 °F up to 260 °C /
500 °F
Regularly check the safety controller setting relating to the entered temperature set-point
Set the safety controller set-point by approx. 2 °C to 5 °C above the desired temperature set-
point.
Setting:
In Normal display press the arrow-up button to access the “OCtl” (safety control-
ler) setting menu.
The current safety controller value is shown (upper display)
Press the confirmation button. The display “OCtl” flashes.
Enter the desired safety controller value with the arrow buttons and confirm with
confirmation button.
The new safety controller value is activated.
Press the arrow-down button to return to Normal display.
Example:
or
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