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KBF / KBF-UL + KMF (E6) 04/2020 page 84/163
12.3.2 Temperature safety device class 3.2
The safety device class 3.2 is equivalently set to a minimum temperature the
chamber will not fall below. This protection against prohibited low tempera-
tures can, for example, serve to protect sensitive cultures from cooling down
too much.
If the control knob (9) is turned to its minimum (position 1), the safety device
class 3.2 has no effect. If it is set to a temperature somewhat lower than that
selected by means of the controller, it functions as a protective device for the
material under treatment.
If the temperature safety device class 3.2 has assumed regulation, identifiable by the red alarm lamp (9a)
lighting up, the message “Temp. safety device” on the controller display, and the buzzer sounds, please
proceed as follows:
• Reset the buzzer with the Reset alarm icon on the controller.
• Disconnect the chamber from the power supply.
• Have an expert examine and rectify the cause of the fault.
• Start up the chamber again
Setting:
To check the response temperature of the safety device class 3.2, put the chamber into operation and set
the desired set point at the temperature controller.
The sections of the scale from 1 to 10 correspond to the temperature range from -40 °C / -40 °F to +160
°C / 320 °F and serves as a setting aid.
• Turn the control knob (9) of the safety device by means of a coin to position 1
(thermostat without effect).
• When the set point is reached, reset the safety device to its trip point (turn it
clockwise).
• The trip point is identifiable by the red alarm lamp (9a), the message “Temp.
safety device
” on the controller display, and the buzzer sounds. Reset the
buzzer with the Reset alarm icon on the controller.
• The optimum setting for the safety device is obtained by turning the control
knob counter-clockwise by approximately two scale divisions, whic
h shuts off
the red alarm lamp (9a).
Figure 18
: Setting
safety device class 3.2
Check the setting regularly and adjust it following changes of set-point or charge.
Function check:
Check the temperature safety device class 3.2 at appropriate intervals for its functionality. It is recom-
mended that the authorized operating personnel should perform such a check, e.g., before starting a
longer work procedure.
(9a)
(9)
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