Hettich ROTO SILENTA 630 RS Mode D'emploi page 41

27.4 Deleting program linking
•
Press the key in order to display the parameter PROG-Nr. The input field will be displayed inversely.
PROG
•
Set the program location for the first program (XX+) by means of the control knob
•
Press the key. The centrifugation data for the selected program location will be displayed.
RCL
•
Press the key twice in order to display the parameter PR-PART. The input field will be displayed inversely.
PROG
•
Press the key twice.
STO
• Press the key.
PROG
28 Cooling (only in centrifuges with cooling)
The temperature set-point can be adjusted from -20°C to +40°C. The lowest obtainable temperature is dependent on
the rotor (see Chapter "Anhang/Appendix, Rotoren und Zubehör/Rotors and accessories"). If the actual temperature
and the set temperature deviate more than 5 °C, the temperature value in the display will start to flash on and off.
28.1 Standby-cooling
With rotor standstill and closed lid the centrifugal chamber is cooled to the pre-selected temperature. The
temperature set-point is shown in the display.
28.2 Pre-cooling the rotor
For rapid pre-cooling of the unloaded rotor and the accessories, it is recommended that the centrifuge is run with the
continuous running settings and a speed of ca. 20% of the maximum rotor speed.
29 Heating (only on centrifuges with heating/cooling option)
During operation of the centrifuge the centrifuge chamber can be heated as required to the preselected temperature.
The heating is switched off when the rotor is stationary.
Risk of burning! The surface temperature of the heating element in the centrifugal chamber of the centrifuge
can reach 500°C / 932°F. Do not touch the heating element.
30 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.
2
⎛ ⎞
RPM
⎜ ⎟
= × ×
r 1,118
⎝ ⎠
1000
For more on the centrifugal radius see the chapter " Anhang/Appendix,
Rotoren und Zubehör/Rotors and accessories".
RCF
⇒ =
RPM
×
r 1,118
EN
.
×
1000
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