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FP (E1.1) 03/2019 page 58/90
Figure 10: Temperature safety device class 3.3
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 (2) 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 (2a) lighting up,
proceed as follows:
• Disconnect the chamber from the power supply
• Have an expert examine and rectify the cause of the fault
• Start up the chamber again 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
desired set-point at the temperature controller.
The sections of the scale from 1 to 10 correspond to the temperature range from 63 °C to 350 °C and
serve as a setting aid.
• Turn the control knob (2) of the safety device using a coin to its end-
stop (position 10) (chamber protection).
• When the set point is reached, turn back the control knob (2) until its
trip point (turn it counter-clockwise).
• The trip point is identifiable by the red alarm lamp (2a) lighting up.
• The optimum setting for the safety device is obtained by
turning the
control knob clockwise by approximately one
scale division, which
leads to extinguish the red alarm lamp.
Figure 11
: Setting the safety
device class 3.1
Check the setting regularly and adjust it following any changes of the set-point.
Function check:
Check the temperature safety device class 3.1 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.
(2)
(2a)
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