BINDER BF 53 - Manual (Page 30)

BF (E1) 02/2015 page 30/51
7. Temperature safety device class 3.1 (DIN 12880)
The temperature safety device class 3.1 serves to protect the incubator, its environment and the charging
material from exceeding the maximum permissible temperature.
Please observe the guideline BGI/GUV-I 850-0 on safe working in laboratories (formerly BGR/GUV-R 120
or ZH 1/119 laboratory guidelines issued by the employers’ liability insurance association) (for Germany).
Figure 6: 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.
If the safety device has taken over control (identifiable by the red alarm lamp (7a) lighting up and, in case
of the option audible alarm with activated buzzer (chap. 8.1), by the buzzer sounding), proceed as follows:
•
Disconnect the unit from the power supply.
• Have an expert examine and rectify the cause of the fault.
• Restart the unit (see chap. 5).
Adjustment:
In order to check at which temperature the safety device class 3.1 responds, turn on the chamber and set
the desired set-point on the temperature controller
The sections of the scale from 1 to 10 correspond to the temperature range from 0 °C / 32 °F to 120 °C /
248 °F and serve as a setting aid.
1. Turn the control knob (7) of the safety device with a coin to its end-
stop (chamber protection).
2. When the set point is reached, turn the control knob (7) to its trip
point (turn it counter-clockwise)
3. The trip point is identifiable by the red alarm lamp (7a) lighting up.
With the option audible alarm and the buzzer activated (chap. 8.1),
the buzzer sounds as an additional signal. You can turn it off with
switch (10).
4. The optimum setting for the safety thermostat class 3.1 is obtained
by turning the control knob clockwise by approximately one scale
division, which leads to extinguish the red alarm lamp (7a).
Check the setting regularly and adjust it following any changes of the set-point.
(7)
(7a)