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FED (E2) 03/2019 page 30/57
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. 7.3), by the buzzer sounding), proceed as follows:
• Disconnect the chamber from the power supply.
• Have an expert examine and rectify the cause of the fault.
• Restart the chamber (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 63 °C / 145.4 °F to
350 °C / 662 °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 back the control knob (7)
until 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.
7.3), the buzzer sounds as an additional signal. You can turn it
off with switch (11).
4. The optimum setting of the safety device 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.
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.
7.3 Disconnectable audible over-temperature alarm (option)
This option permits activating an audible signal with the buzzer switch (11):
Position 0 = buzzer off
Position 1 = buzzer active
If the buzzer is activated, an audible signal sounds when the limit temperature set at the temperature
safety device class 2 (chap. 7.1) or class 3.1 (chap. 7.2) is exceeded, this happens in addition to the red
alarm pilot lamp (7a) lighting up. The buzzer can be turned off using the buzzer switch (11).
Turning off the audible alarm does not influence the safety device’s regulatory or turning-off
function. Proceed as described in chap. 7.1 / 7.2.
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