Refrigerated centrifuge Sigma 4-5KL
Refrigerated centrifuge Sigma 4-5KL IVD
6 Using the centrifuge
Version 06/2020, Rev. 1.2 of 28/04/2022
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Translation of the original operating manual, part no. 0703602
Short run
A short run can be started if no run is active.
• Keep the start key pressed during the short run.
During the short run, the centrifuge accelerates with the acceleration curve
9 (maximum) until the maximum permissible speed of the rotor is reached.
The runtime is counted and in the "Time" field the indication "Short" is
displayed.
When the start key is released, the centrifuge decelerates to a standstill
based on the maximum deceleration curve.
When the short run is completed, the original parameters (curves, runtime,
and final speed) are restored and displayed.
Fig. 18:
Indication “Short” during a short run
6.3.2.7
Temperature
The set value is displayed in the upper area of the field and the actual
sample temperature is displayed in the lower area. Temperatures between
-10 °C and +40 °C can be preselected.
NOTE
The centrifuge is not equipped with an active heater. This is why
temperatures above room temperature depend on the air friction of the
turning rotor.
fig. 19: Setting the temperature
Precooling
Depending on the substances to be centrifuged, it may make sense to
precool the centrifuge. The precooling prevents the cooled samples in the
uncooled centrifuge from heating up to an inadmissible temperature.
CAUTION
Unmoved air in the rotor chamber distorts the measuring and control
behavior and causes the compressor to freeze over. At temperatures
below 0°C, aqueous liquids will freeze, making sedimentation impossible.
• Ensure that the rotor temperature will not fall below 0 °C when the
rotor is at a standstill!
