Universal R-320 Operations Instructions download pdf (Page 41)

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22 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

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:

[RPM] speed maximum x

[kg/dm³]density Greater

1.2

= )(n speed Reduced

red

e.g.: maximum speed RPM 4000, density 1.6 kg/dm

RPM 3464 = RPM 4000 x

kg/dm³ 1.6

kg/dm³ 1.2

= n red

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:

[RPM] speed maximum x

[g] load actual

[g] load maximum

= )(n speed Reduced red

e.g.: maximum speed RPM 4000, maximum load 300 g, actual load 350 g

RPM 3703 = RPM 4000 x

g 350

g 300

= n red

If in doubt you should obtain clarification from the manufacturer.

23 Rotor Identification

After every start of a centrifugation run the rotor utilised is identified.

After a change of rotor the drive switches off and the rotor code (R xx) as well as the maximum rotational speed

(n-max=xxxxx) of the rotor are displayed.

A further operation of the centrifuge is only possible after a single opening of the lid.

If, following a rotor change, the maximum speed of the rotor is less than the set speed, the speed is limited to

the maximum speed of the rotor.

24 Emergency release

During a power failure the lid cannot be unlocked by motor. An emergency release has to be executed by hand.

For emergency release disconnect the centrifuge from the mains.

Open the lid only during rotor standstill.

See figure on page 2.

• Switch off the mains switch (switch position "0").

• Look through the window in the lid to be sure that the rotor has come to a standstill.

• Insert the hexagonal wrench key into the bore hole (Fig. 1, A) and carefully rotate by half a turn in clockwise

direction until the lid can be opened.

• Pull the hexagon socket head wrench out of the drilling again.

• If the left LED in the

OPEN / STOP

button flashes after the centrifuge is switched on again, press the

OPEN / STOP

button so that the motor-driven lid lock goes into the basic position (opened) again.

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Universal R-320 Operations Instructions Page 41

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