Brake Adjustment; Start Centrifuging Run; End Centrifuging Run; Relative Centrifugal Force (Rcf) - Hettich HAEMATOKRIT 210 Operating Instructions Manual

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12.4

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.
12.5

Start centrifuging run

If the permissible weight difference is exceeded within the rotor loading, the drive switches off during the run-
up time, and error -3- is displayed (see chapter "Faults").
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
12.6

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.
13

Relative centrifugal force (RCF)

The relative centrifugal force (RCF) is given as a multiple of the acceleration of gravity (g). It is a unit-free value and
serves to compare the separation and sedimentation performance.
These values are calculated using the formula below:
RCF
RCF = relative centrifugal force
RPM = rotational speed (revolutions per minute)
r = centrifugal radius in mm = distance from the centre of the turning axis to the bottom of the centrifuge.
The relative centrifugal force (RCF) stands in relation to the revolutions per minute and the centrifugal
radius.
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and the arrow key
in the speed field until the depicted display appears.
START
t
STO P
key.
.
key or after expiry of the set run time. Once the rotor has come to a
.
2
⎛ ⎞
RPM
⎜ ⎟
= × ×
r 1,118
⎝ ⎠
1000
For more on the centrifugal radius see the chapter " Anhang/Appendix,
Rotoren und Zubehör/Rotors and accessories".
in the speed area and switch on the mains switch.
RPM x 100
Speed area Time area
Low braking effect "0"
and arrow keys.
.
STOP
key.
.
RCF
⇒ =
RPM
×
r 1,118
START
t
STO P
.
, operation of the
×
1000