Recall Hours Of Operation; Cooling (Only In Centrifuges With Cooling); Standby-Cooling; Pre-Cooling The Rotor - Hettich ROTINA 35 Handbuch

EN
17

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.
18

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").
18.1

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.
18.2

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.
19

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.
20

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.
21

Emergency release

The lid cannot be opened during power failure. 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.
•
Insert the release pin (see scope of supply) horizontally into the hole (Fig. 1, A). Push the release pin in until,
when the pin is pushed up, the handle can be swung up.
•
Open the lid.
16/56
1.2
= x Rated speed
Greater density
3
RPM
3
when