Start Centrifuging Run; End Centrifuging Run; Relative Centrifugal Force (Rcf); Emergency Release - Hettich MIKRO 120 Bedienungsanleitung

15.5

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
15.6

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.
16

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.
17

Emergency release

The lid cannot be opened during power failure. An emergency release has to be executed by hand.
For emergency release disconnect the centrifuge from the mains.
Open the lid only during rotor standstill.
Only the plastic release pin provided may be used for emergency release.
1. Switch off the mains switch (switch position "0").
2. Look through the window in the lid to be sure that the rotor has come to a standstill.
3. Insert the release pin horizontally into the hole located in the middle of the front panel, see drawing.
4. Push the release pin to the right, then up to a 45° position. Pull the lid upwards at the same time to unlock, see
drawing.
5. Remove the release pin from the hole again.
1.
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".
2.
.
STOP
key.
.
RCF
⇒ =
RPM
×
r 1,118
EN
.
, operation of the
×
1000
25/56