Sigma 1-15PK, Руководство по эксплуатации

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Version 08/2008, Rev. 1.7 - sb page 41 of 75
English translation
5.3.4.1 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.
Precooling at a standstill
Unmoved air in the centrifuge chamber distorts the measuring and control
behavior and causes the compressor to freeze overs. At temperatures below
0°C, aqueous liquids will freeze, making sedimentation impossible.
•
Ensure that the rotor temperature will not fall below 0 °C if it is at a standstill!
Rapid cooling program "RAPID TEMP"
Precooling at a standstill may distort the measurement results and subsequently
cause increased wear of the mechanical components. This is why the centrifuge
has a special program that precools the centrifuge under defined conditions:
•
Turn the left rotary knob until “run” appears on the display.
•
Select the option by pressing the right rotary cursor. “Run” will now flash.
•
Turn the right rotary knob until " PrC" is displayed.
•
Press the right rotary knob or the start key to confirm the input. The display
shows 1/3 of the maximum rotor speed and the corresponding RCF value.
The runtime field indicates "cont" and the symbol "
∞
" for continuous run.
The program will only be loaded if the actual temperature is above the set
temperature.
The program runs until the set value is reached. Then, a sound signal is issued (if
it is activated – see 5.3.9) and the program that was set beforehand will be
reloaded.
•
Press the stop key to determinate the rapid cooling program prematurely.
)
Attention!
An entry will interrupt the rapid cooling program. There will be no message when
the set temperature is reached. If no new runtime is entered, the centrifuge will
continue to run infinitely (continuous run).
Fig. 5.19:
Rapid cooling program
"RAPID TEMP"