BINDER KB 23 - Manual (Page 69)

KB (E3.1 + E5.1) 11/2014 page 69/100
14.3.2 Temperature safety device class 3.2
The safety device class 3.2 is equivalently set to a minimum temperature the unit will not fall below. This
protection against prohibited low temperatures can, for example, serve to protect sensitive cultures from
cooling down too much.
If the control knob (12) 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 its red alarm lamp
lighting up, with KB (E5.1) also by the message “TEMP ALARM” on the controller display, and the buzzer,
then proceed as follows:
•
Mute the buzzer with the EXIT button (KB (E5.1) only).
• Disconnect the unit from the power supply.
• Have an expert examine and rectify the cause of the fault.
• Start the unit again as described in chap. 5.
Setting:
To check the response temperature of the safety device class 3.2, put the unit 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 of the safety device by means of a coin to its
minimum (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 lighting up; with KB
(E5.1) in addition the buzzer sounds, and the message “TEMP ALARM” is
shown in Display 2.
• The optimum setting for the safety device is obtained by turning the control
knob counter-clockwise by approximately two scale divisions, which shuts
off the red alarm lamp.
Figure 17: Setting safety device class 3.2
Check the setting regularly and adjust it following changes of the set-point or charge.
Function check:
Check the temperature safety device class 3.2 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.