Centrifugation Of Materials Or Mixtures Of Materials With A Density Higher Than 1.2 Kg/Dm; Emergency Release; Maintenance And Servicing - Hettich MIKRO 200 Bedienungsanleitung

EN
21

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.
22

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 so that the motor-driven lid lock goes into the basic position (opened) again.
23

Maintenance and servicing

The device can be contaminated.
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.
•
Centrifuges, rotors and accessories must not be cleaned in rinsing machines.
•
They may only be cleaned by hand and disinfected with liquids.
•
The water temperature must be between 20 – 25°C.
•
Only detergents/disinfectants may be used which:
− have a pH between 5 - 8
− do not contain caustic alkalis, peroxides, chlorine compounds, acids and alkaline solutions
•
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.
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1.2
x maximum
Greater density [kg/dm³]
3
RPM = 3464 RPM
maximum load [g]
x maximum
actual load [g]
= 3703 RPM
button flashes after the centrifuge is switched on again, press the
speed [RPM]
speed [RPM]
3
OPEN / STOP