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BD / ED / FD (E2) 03/2019 page 28/68
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 chamber from the power supply.
• Have an expert examine and rectify the cause of the fault.
• Restart the chamber (see chapter 5).
Adjustment:
To check the response temperature of the safety thermostat class 3.1, 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 (BD) or from 63 °C / 145.4 °F to 350 °C / 662 °F (ED or FD, option) 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.
8.1), the buzzer sounds as an additional signal. You can turn it
off with switch (10) resp. (9).
4. The optimum setting of the safety device is obtained by turning
the control knob clockwise by approx. one scale divis
ion, 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.
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