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M (E2) 04/2019 page 38/71
The chamber is only active with the reset button (3b) pushed in.
When the safety device class 2 responds, the red alarm lamp (3a) illuminates, the reset button (3b) pops
out, and the chamber turns off permanently.
Check the setting regularly and adjust it following any changes of the set-point.
Function check:
Check the temperature safety device class 2 at appropriate intervals for its functionality. It is recommend-
ed that the authorized operating personnel should perform such a check, e.g., before starting a longer
work procedure.
10.2 Temperature safety device class 3.1 (DIN 12880) (available via BINDER
INDIVIDUAL customized solutions)
The temperature safety device class 3.1 acc. to DIN 12880:2007 protects the chamber, its environment
and the charging material from exceeding the maximum permissible temperature. In the event of a fault, it
limits the temperature inside the chamber to the value set on the safety device.
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).
Figure 9: Temperature safety device class 3.1
Function:
The temperature safety device is functionally and electrically independent of the temperature control sys-
tem and if an error occurs it performs a regulatory function.
If you turn the control knob (3) 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 class 3.1 has taken over control, identifiable by the red alarm lamp
(3a) lighting up, proceed as follows:
• Disconnect the chamber from the power supply.
• Have an expert examine and rectify the cause of the fault.
• Restart the chamber as described in chap. 5.
Setting:
To check the response temperature of the safety device class 3.1, turn on the chamber and set the de-
sired set-point at the temperature controller.
The sections of the scale from 1 to 10 correspond to the temperature range from 63 °C / 145.4 °F up to
350 °C / 662 °F and serve as a setting aid.
(3)
(3a)
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