Brake Adjustment; Start Centrifuging Run; End Centrifuging Run; Calculating Rotational Speed Rpm And Relative Centrifugal Force Rcf - Hettich EBA 20 Bedienungsanleitung

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13.4

Brake adjustment

With this centrifuge, the braking effect can be set to normal or low.
This can be set before a run, as follows:
1. Switch off the mains switch
2. Simultaneously press the pulse key
Release the keys again.
3. If required press the arrow button
In the speed field the machine version as set by the factory and in the time field the brake setting.
RPM x 100
Speed area Time area
Normal braking effect "1"
4. Set the required value, "1" or "0", in the time area with the
5. Confirm the set value with the
See Rotors and Accessories in the Braking Times chapter.
13.5

Start centrifuging run

The centrifugation run can be interrupted at any time by pressing the key
The time and speed can be changed during the centrifugation run, with the keys
If the key or is kept pressed, the value changes with increasing speed.
After a centrifugation run, the display flashes until the cover is opened or a key is pressed.
If the symbol " " (lid closed) and " " (lid open) flashes alternately in the rotation indicator
centrifuge can only be continued after opening the lid.
After setting the centrifuging parameters, start the centrifuge by pressing the
13.6

End centrifuging run

A centrifuging run is ended by pressing the
stop the lid lock is briefly triggered and the display flashes. The lid can now be opened.
14

Calculating rotational speed RPM and relative centrifugal force RCF

These values are calculated using the formulas below:
RCF
RCF = Relative centrifugal force
RPM = Rotational speed (revolutions per minute)
r = Radius in mm
20/46
and the arrow key
in the speed field until the depicted display appears.
START
t
STOP
key.
.
key or after expiry of the set run time. Once the rotor has come to a
.
2
⎛ ⎞
RPM
⎜ ⎟
= × ×
r 1,118
⎝ ⎠
1000
= Distance from the centre of the axle to the floor of the
centrifuge container. For further details on radius see
"Anhang/Appendix, Rotoren und Zubehör/Rotors and
accessories" section.
in the speed area and switch on the mains switch.
RPM x 100 t
Speed area Time area
Low braking effect "0"
and arrow keys.
.
STOP
key.
.
RCF
= ×
RPM
×
r 1,118
START
STOP
.
, operation of the
1000