Centrifugation Of Materials Or Mixtures Of Materials With A Density Higher Than 1.2 Kg/Dm; Rotor Recognition - Hettich ROTINA 380 Robotic Bedienungs- Und Einbauhinweise

38

Centrifugation of materials or mixtures of materials with a density higher than 1.2 kg/dm

When centrifuging with maxim revolutions per minute the density of the materials or the material mixtures may not
3
exceed 1.2 kg/dm .
The speed must be reduced for materials or mixtures of materials with a higher density.
The permissible speed can be calculated using the following formula:
Reduced speed (n )
red
e.g.: maximum speed RPM 4000, density 1.6 kg/dm
1.2 kg/dm³
n = x 4000
red
1.6 kg/dm³
In the exceptional case that the maximum loading indicated on the hanger is exceeded, the speed must also be
reduced.
The permissible speed can be calculated using the following formula:
Reduced speed (n )
red
e.g.: maximum speed RPM 4000, maximum load 300 g, actual load 350 g
300 g
n = x 4000 RPM
red
350 g
If in doubt you should obtain clarification from the manufacturer.
39

Rotor recognition

Rotor recognition is carried out after each start of the centrifugation run.
If the rotor has been changed, the centrifugation run is canceled after rotor recognition. The rotor code (Rotor), the
maximum speed of the rotor (Nmax) and a centrifuging radius (R) of the newly detected rotor are displayed, e.g.
Rotor 4 Nmax= 4500 R=184 mm .
If the maximum speed of the rotor being used is less than the set speed, the speed is limited to the rotor's
maximum speed. In this case, the program place number is displayed in parentheses ().

Start the centrifugation run via the interface.
If the cycle counter is activated, the number of rotor cycles (centrifugation runs) of the current rotor code
is displayed briefly when the lid is opened, e.g. CYCLES 5120 of 30000 (see chapter "Cycle Counter").
1.2
=
Greater density [kg/dm³]
3
RPM = 3464 RPM
maximum load [g]
= x maximum
actual load [g]
= 3703 RPM
x maximum speed [RPM]
speed [RPM]
EN
3
77/83