Centrifugation Of Materials With Higher Density; Rotor Identification; Emergency Release; Maintenance And Servicing - Hettich ROTINA 380 Mode D'emploi

29

Centrifugation of materials with higher density

The rotors are designed to centrifuge substances up to a maximum mean homogenous density of 1.2 kg/dm
rotating at the stated speed.
Denser substances must be centrifuged at lower speed.
The permissible speed can be calculated using the following formula:
Reduced speed (n )
red
e.g.: RPM 4000, density 1.6 kg/dm
1.2
n = x 4000 = 3464
red
1.6
If in doubt you should obtain clarification from the manufacturer.
30

Rotor Identification

After every start of a centrifugation run the rotor utilised is identified.
After changing a rotor, the engine switches off and the rotorcode (rotor), the maximum rotor speed of the rotor
(Nmax) and the preset centrifuging radius (R) of the rotor being used are displayed, e.g. rotor 4 Nmax= 4500
R=184 mm .
•
Press the key to open the lid, or press the
STOP / OPEN
with refrigeration, precooling of the rotor can also be started by pressing the
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. In this case, the program place number is displayed in parentheses ().
31

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.
•
After turning the centrifuge on again, press the button
again assumes the normal position (opened).
32

Maintenance and servicing

Pull the mains plug before cleaning.
Before any other cleaning or decontamination process other than that recommended by the manufacturer is
applied, the user has to check with the manufacturer that the planned process does not damage the device.
•
Cleaning agents and disinfectants which lie in the pH range 5 – 8 are to be utilised. Alkaline cleaning agents with
a pH value > 8 are to be avoided.
•
In order to prevent appearances of corrosion through cleaning agents or disinfectants, the application guide from
the manufacturer of the cleaning agent or disinfectant are absolutely to be heeded.
32.1

Centrifuge

•
Clean the centrifuge housing and the centrifuging chamber regularly, using soap or a mild detergent and a damp
cloth if required. For one thing, this services purposes of hygiene, and it also prevents corrosion through
adhering impurities.
•
In the event of condensation water formation, dry the centrifugal chamber by wiping out with an absorbent cloth.
•
If infectious materials penetrates into the centrifugal chamber this is to be disinfected immediately. For surface
disinfection we recommend Bacillol® manufactured by Bode Chemie in Hamburg or Biocidal ZF
company WAK-Chemie Medical GmbH in Steinbach.
•
Lightly rub the rubber seal of the centrifuge chamber with talcum powder or a rubber care product after each
cleaning.
1.2
= x Rated speed
Greater density
3
RPM
key to start the centrifugation run. For centrifuges
START
key.
so that the motor-driven lid locking once
STOP / OPEN
EN
3
when
TM
from the
37/105