Section 7 - Cleaning And Periodic Maintenance; Periodic Maintenance; Sterilization; Corrosion Information - NUVE NF48 User Manual


The rotor is driven by a three phase asynchronous motor. The microprocessor control
system assures the correct drive speed.

The force applied to the rotor is directly related to the shape of the rotor, the swing-out
rotor receives more load than the angle rotor does. Longer radius and more
accessories increase the load of the rotor and decrease the spinning speed.

The centrifuge does not allow the rotor to spin at a speed which it cannot resist
mechanically.

Please make that sure the correct type of rotor is selected during programming.
SECTION 7 – CLEANING AND PERIODIC MAINTENANCE
7.1

PERIODIC MAINTENANCE


Disconnect the power cable and after the maintenance check the presence of the
mains grounding line.

Rotors should be washed after every use, especially if a spillage has occurred, in warm
water containing a few drops of liquid soap. (A mild washing liquid is ideal as a
cleaner).

Rotors and other accessorıes must be clean if any spillage or chemicals occur.

You may use a nylon brush to clean the buckets and tube inserts of the rotor.

Do not use metal brushes.

Dry the rotor with a piece of soft absorber cloth. Please make sure that the buckets and
inserts are well dried, you may use hair dryer.

The buckets of the swing-out rotors should be greased frequently with the oil provided
with the centrifuge. Please remove the light oil from the pins and put a small amount of
fresh oil every time you grease. This will ensure free swinging of the buckets. Most of
the imbalance problems are mostly raised by the users who do not clean and oil the
pins.

Please do not leave the rotor on a metal surface, particularly stainless steel as
electrochemical reactions set off easily with the aluminum or magnesium in the rotor.

Make sure that no deposit remains at the bottom of the bucket because the pressure of
a flask or tube from above during centrifugation will certainly increase the chance of
corrosion.
7.2

STERILIZATION


Apply alcohol, for example %70 ethanol or isoprophanol, for 10 minutes against
bacteria and viruses.

The rotors and buckets may be autoclaved at 121°C and under 215 kPa pressure for
20 minutes but please do not forget to remove all accessories.

Do not use formaldehyde for the sterilization process.

Phenol is a corrosive substance and should never be used.

Glutaraldehyde is a toxic substance and increases the rate of fatty acid in the body.
7.3 CORROSION INFORMATIO N

Nuve rotors which are made of aluminum are designed to spin at proper RCFs for
many years. When used properly, their resistance to corrosion and their life span
increases and the imbalance problems decrease.

All accessories should be checked thoroughly and regularly as almost all laboratories
already have the conditions which lead to corrosion easily.
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