Centrifugation; Centrifugation With Time Selection; Continuous Running; Changing Settings During The Centrifugation Run - Hettich ROTIXA 50 S Mode D'emploi

EN
15

Centrifugation

When the centrifuge is running, according to EN / IEC 61010-2-020, no persons, dangerous substances or
objects may be within the safety margin of 300 mm around the centrifuge.
If the permissible weight difference within the rotor loading has been exceeded, the drive shuts down during
the start-up, and IMBALANCE / UNWUCHT is displayed.
If the speed in the selected program is higher than the maximum speed of the rotor (n-max-Rotor), it will not
be possible to start a centrifugation run. The message N > ROTOR MAX 96 will be displayed (see Chapter
"Faults").
A centrifugation run can be stopped at any time by pushing the key
It is possible to switch over between RPM and RCF display at any time using the
working with the RCF display, it is necessary to enter the centrifuging radius.
If OPEN OEFFNEN is displayed, a further operation of the centrifuge is only possible after opening the lid
once.
If R xx n-max xxxxx is displayed, then no centrifugation run has taken place as the rotor was changed
beforehand, refer to Chapter " Rotor Identification ".
• Switch on the mains supply switch. Switch position Ι.
•
Load the rotor and close the centrifuge lid.
15.1

Centrifugation with time selection

•
Set the time or call up a program with a pre-set time (see Chapter "Entering centrifugation parameters" or
"Calling up programs").
•
Press the key. The rotation indicator
START
•
When the time has expired or if the centrifugation run is interrupted by pressing the
place with the selected run-down parameters. When the rotor comes to a stop, the
display until the lid is opened.
During the centrifugation run, the speed of the rotor or the RCF value resulting from this, the sample temperature (for
centrifuges with cooling only) and the remaining time will be displayed.
15.2

Continuous running

•
Select the ---:-- symbol or call up a continuous running program (see Chapter "Entering centrifugation
parameters" or "Calling up programs").
•
Press the key. The rotation indicator
START
from 00:00.
•
Press the key to stop the centrifugation run. Run-down will take place with the selected run-down
STOP
parameters. When the rotor comes to a stop, the
During the centrifugation run, the speed of the rotor or the RCF value resulting from this, the sample temperature (for
centrifuges with cooling only) and the time run will be displayed.
16

Changing settings during the centrifugation run.

The running time, the speed, the relative centrifugal force (RCF/RZB), the run-up and run-down parameters as well
as the temperature (for centrifuges with cooling only) can be changed while the centrifuge is running.
The parameters can only be changed one at a time and in succession.
•
Select the desired parameter and change the value using the control knob
centrifugation parameters").
•
Press the key. The modified setting will be stored in program location "----" (see Chapter "Automatic
START
buffer"). The original program will not be overwritten.
17 Integral RCF (∫RCF)
The integral RCF (∫RCF) is a measure for the sedimentation effect (∫ n
centrifugation runs. To interrogate the integral RCF, press and hold the
18

Displaying the maximum speed of the rotor

•
Press the key repeatedly until the parameter RPM is displayed and the input field is shown inversely.
n
•
Press the n key once more and hold it pressed; the maximum speed of the rotor (n-max-Rotor) will be displayed.
36/104
STOP
will appear as long as the rotor is turning.
will appear as long as the rotor is turning. The time count starts
symbol will flash in the display until the lid is opened.
2
dt). This numerical value is used to compare
key.
RCF
.
n and keys. When
RCF
key, run-down will take
STOP
symbol will flash in the
(see Chapter "Entering