Technical data

BD / ED / FD 01/2006 page 30/49
1. Turn the control knob (7) of the safety device using a coin to its
end-stop (position 10) (unit protection).
2. When the set point is reached, turn back the control knob (7) until
its trip point (turn it anti-clockwise).
3. The trip point is identifiable by the red alarm lamp (7a) lighting up;
the reset button (7b) jumps out.
With the option acoustic alarm and the buzzer activated (chap.
9.1), the buzzer sounds as an additional signal. It can be
switched off by switch (11).
4. The optimum setting of the safety device is obtained by turning
the knob clockwise by around one graduation mark on the scale.
5. Push the reset button (7b) in again.
The unit is only active with the reset button (7b) pushed in.
When the safety thermostat class 2 kicks in, the red alarm lamp (7a) illuminates, the reset button (7b)
jumps out and the unit switches off permanently at all poles.
Check the safety thermostat with every change of the set point value and readjust it if
necessary.
8.2 Temperature safety device class 3.1 (DIN 12880) BD (option ED, FD))
The temperature safety device serves to protect the incubator, its environment and the contents from
forbidden temperature excesses.
Please also observe the regulations BGR 120 of the German professional association of the chemical
industry (formerly ZH 1/119 laboratory guidelines of the employers’ liability insurance association) (for
Germany).
Function:
The temperature safety device is functionally and electrically independent of the temperature control
system and if an error occurs it assumes the regulatory function.
Figure 7: Safety thermostat class 3.1
If the control knob is turned to its end-stop, the safety thermostat class 3.1 functions as a safety device
for the unit. If it is set to a temperature somewhat higher than that selected on the control, it functions as
a protective device for the material under treatment.
(7)
(7a)