Centrifugation; Centrifugation With Pre-Set Time; Continuous Run; Short-Term Centrifugation - Hettich EBA 21 Bedienungsanleitung

EN
14

Centrifugation

If the permissible weight difference within the rotor loading has been exceeded, the drive shuts down during
the start-up, the unbalance display lights up, and IMBALANCE is displayed.
If the speed in the selected program is higher than the maximum speed of the rotor, it will not be possible to
start a centrifugation run. N > ROTOR MAX will be displayed (see Chapter "Faults ").
A centrifugation run can be stopped at any time by pushing the key
All parameters can be selected and altered during the centrifugation run (see Chapter "Entering centrifugation
parameter").
You can switch-over at any time between the RPM and RCF display with the key
centrifugation radius is necessary if you are working with the RCF display.
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 ".
• Turn on the mains switch. Switch position Ι.
•
Load the rotor and close the centrifuge lid.
14.1

Centrifugation with pre-set time

•
Adjusting time or recall a programme with pre-set time (see Chapter "Entering centrifugation parameter" or
"Programme recall").
•
Press the key . The rotation display
START
•
After expiration of the time or with truncation of the centrifugation run by pushing the key
effected with the selected brake step. The brake step is displayed.
During the centrifugation run the rotational speed of the rotor or the subsequently resulting RCF value, the sample
temperature (only in centrifuges with cooling) and the remaining time will be displayed.
14.2

Continuous run

• Adjusting the symbol ∞ or recall a continuous run programme (see Chapter "Entering centrifugation parameter"
or "Programme recall").
•
Press the key . The rotation display
START
at 00:00.
•
Press the key in order to stop the centrifugation run. The run-down is effected with the selected brake
STOP
step. The brake step is displayed.
During the centrifugation run the rotational speed of the rotor or the subsequently resulting RCF value, the sample
temperature (only in centrifuges with cooling) and the expired time will be displayed.
14.3

Short-term centrifugation

•
Hold down the key
IMPULS
•
Let go of the key
IMPULS
brake step. The brake step is displayed.
During the centrifugation run the rotational speed of the rotor or the subsequently resulting RCF value, the sample
temperature (only in centrifuges with cooling) and the expired time will be displayed.
15

Emergency Stop

•
Press the key twice.
STOP
With Emergency Stop the run-down is effected with brake step 9 (shortest run-down time). Brake step 9 is displayed.
If brake step 0 was pre-selected, the run-down time is technically longer than with brake step 9.
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lights up as long as the rotor is turning.
lights up as long as the rotor is turning. The time metering begins
. The rotation display lights up as long as the rotor is turning.
again in order to stop the centrifugation run. The run-down is effected with the selected
.
STOP
. The input of the
RCF
, the run-down is
STOP