Recall Hours Of Operation; Cooling (Only In Centrifuges With Cooling); Standby-Cooling; Pre-Cooling The Rotor - Hettich ROTANTA 460 Mode D'emploi

EN
16

Recall hours of operation

Recall hours of operation is only possible during rotor standstill.
•
Hold down the key for 8 seconds.
After 8 seconds, SOUND / BELL appears in the display.
•
Press the key once again.
The centrifuge's hours of operation (CONTROL: ) are displayed.
•
Press the key or to exit the hours of operation recall.
17

Cooling (only in centrifuges with cooling)

The temperature set-point can be adjusted from -20°C to +40°C. The lowest obtainable temperature is dependent on
the rotor (see Chapter "Anhang/Appendix, Rotoren und Zubehör/Rotors and accessories").
17.1

Standby-cooling

With rotor standstill and closed lid the centrifugal chamber is cooled to the pre-selected temperature. The
temperature set-point is shown in the display.
17.2

Pre-cooling the rotor

For rapid pre-cooling of the unloaded rotor and the accessories, it is recommended that the centrifuge is run with the
continuous running settings and a speed of ca. 20% of the maximum rotor speed.
18

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.
19

Rotor Identification

After every start of a centrifugation run the rotor utilised is identified.
After the rotor has been changed, the drive switches off and the maximum speed and the rotor code are displayed
briefly.
Afterwards, OPEN OEFFNEN is displayed and further operation of the centrifuge is only possible after opening
the lid once.
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.
20

Emergency release

In the event of a power failure the lid cannot be opened by motor. An emergency release has to be executed by
hand.
For emergency release disconnect the centrifuge from the network.
Open the lid only during rotor standstill.
Please turn to the rear side of the cover sheet.
•
Pull the plug out of the drilling (Fig. 1, A).
•
Insert the hexagon socket head wrench horizontally in the drilling, and carefully turn a half revolution in clockwise
direction until the lid is able to be opened.
•
Pull the hexagon socket head wrench out of the drilling again.
•
Re-insert the plug.
•
After turning the centrifuge on again, press the button
the normal position (opened).
16
1.2
= x Rated speed
Greater density
3
RPM
so that the motor-driven lid locking once again assumes
3
when