Of Denser Substances; Run Time; Continuous Operation; Pulsed Operation - Hettich MIKRO 120 Bedienungsanleitung

EN
15.2

- of denser substances

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:
e.g.: RPM 4000, density 1.6 kg/dm
If in doubt you should obtain clarification from the manufacturer.
15.3

Run time

Each time the and arrow keys are activated, the run time is changed by 1 minute. If an arrow key is kept pressed
down for longer, the run time is changed in minute steps, at an increasing rate.
If the run time is changed during operation, this becomes effective immediately, i.e. the remaining run time is
adjusted.
If an arrow key is activated during operation, the run time or speed is adjusted accordingly.
15.3.1

Continuous operation

The centrifuge can be operated in continuous operation. Continuous operation is set by pressing the
until " – " appears in the run time display. Operation is only stopped by activating the
15.3.2

Pulsed operation

For brief centrifuging. The rotor turns at the preselected speed as long as the
15.4

Brake adjustment

With this centrifuge, the braking effect can be set to normal or low.
This can be set before a run, as follows:
1. Switch off the mains switch
2. Simultaneously press the pulse key
Release the keys again.
3. If required press the arrow button
In the speed field the machine version as set by the factory and in the time field the brake setting.
RPM x 100
Speed area Time area
Normal braking effect "1"
4. Set the required value, "1" or "0", in the time area with the
5. Confirm the set value with the
See Rotors and Accessories in the Braking Times chapter.
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Reduced speed (n ) =
red
3
1.2
n = x
red
1.6
and the arrow key
in the speed field until the depicted display appears.
START
t
STOP
key.
.
1.2
x Rated speed
Greater density
4000 = 3464 RPM
key is pressed down.
in the speed area and switch on the mains switch.
RPM x 100 t
Speed area Time area
Low braking effect "0"
and arrow keys.
3
when
arrow key
key.
.
START
STOP