35
Operation
Centrifuge 5702/5702 R/5702 RH
English (EN)
5.8.6 Calculating the speed of centrifugation
The g-force that is shown on the display is standardized for rotor A-4-38 with conical tubes 15 mL without
an adapter. If different rotors and adapters are used, different g-forces are achieved.
To calculate the g-force, use the following formula in accordance with DIN 58 970:
• rcf = 1.118 ·10
-5
· n
2
· r
max
–rcf: g-force
– n: Rotational speed in rpm
– r
max
: maximum centrifugation radius in cm
Example 1
• The adapter for HPLC vessels in the rotor F-45-18-17-Cryo has a maximum radius of 8.3 cm.
• At a speed of 6 142 rpm, a maximum g-force of 3 500 × g is achieved.
Example 2
• The adapter 85 mL has a maximum radius of 13.5 cm.
• At 4,000 rpm a maximum g-force of 2,415 × g is achieved.
5.9 Centrifuge 5702 R, Centrifuge 5702 RH: Heating and cooling
The rotor chamber of the Centrifuge 5702 R can be cooled. The rotor chamber of the Centrifuge 5702 RH
can be heated and cooled.
5.9.1 Setting the temperature
Prerequisites
• The centrifuge is switched on.
• The centrifuge lid is closed.
1. Use the temp arrow keys to set the set temperature.
2. Set the centrifugation time and centrifugation speed.
3. Press the rotary knob time to start centrifugation.
The temperature can be changed during centrifugation.
Maximum g-force and maximum radius for the corresponding rotors and adapters (see Rotors,
tubes and adapters on p. 65).
The temperature that can actually be reached depends on the rotor and the set rotational
speed.
If the rotor stops (continuous cooling), cooling is slower than during centrifugation or a
temperature control run.
At high ambient temperatures the fan may be audible briefly until the set temperature is
reached. A running fan indicates a high cooling performance.
At ambient temperatures < 18 °C a warm-up period of approx. 1 h is required for it to function
properly.
To Next Page
Loading...
