BINDER M 53 - Manual (Page 40)

M (E2) 10/2014 page 40/71
10. Temperature safety devices
10.1 Temperature safety device class 2.0 (DIN 12880)
The temperature safety device class 2 protects the drying and heating oven, 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 Ger-
many).
In the event of a fault in the temperature controller, the safety device (3)
permanently turns off the
chamber. This status is reported visually by the indicator lamp (3a).
Check the operation of the safety device (3) by moving it slowly counter-clockwise until the chamber turns
off. The safety device cut-off is reported visually by the indicator lamp (3a).
Then release again the safety device by pressing the reset button (3b), and turn on the chamber as de-
scribed.
Figure 8: Temperature safety device class 2
Function:
The safety device class 2 is functionally and electrically independent of the temperature control device
and turns off the chamber permanently.
If you turn the control knob (3) to its end-stop (position 10), the safety device protects the appliance. 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 turned off the chamber, identifiable by the red alarm lamp (3a) lighting up, pro-
ceed as follows:
•
Disconnect the chamber from the power supply.
• Have an expert examine and rectify the cause of the fault.
• Release the safety device by pressing the reset button (3b).
• Restart the chamber as described in chap. 5.
Setting:
To check the response temperature of the safety device, turn on the chamber and set the desired set-
point at the temperature controller.
The sections of the scale from 1 to 10 corresponds to the temperature range from 30 °C / 86 °F up to 320
°C / 608 °F and serves as a setting aid.
•
Turn the control knob (3) of the safety device using a coin to its end-stop (position 10) (chamber pro-
tection).
• When the set-point is reached, turn back the control knob (3) until its trip point (turn it counter-
clockwise)
• The trip point is identifiable by the red alarm lamp (3a) lighting up; the reset button (3b) pops out.
• The optimum setting of the safety device is obtained by turning the control knob clockwise by approx.
one graduation mark on the scale.
• Push the reset button (3b) in again.
(3)
(3a)
(3b)