Cooling (Only In Centrifuges With Cooling); Standby-Cooling; Precooling Of The Rotor; Time-Controlled Cooling - Hettich ROTINA 420 Mode D'emploi

EN
37

Cooling (only in centrifuges with cooling)

The temperature set-point can be adjusted from -20°C to +40°C / -4°F to +104°F. On centrifuges with a
heating/cooling option, the temperature set-point is settable from -20°C to +90°C / -4°F to +194°F. The lowest
obtainable temperature is dependent on the rotor (see Chapter "Anhang/Appendix, Rotoren und Zubehör/Rotors and
accessories").
37.1

Standby-cooling

When the rotor is at a standstill and when the lid is closed, the centrifugal chamber is cooled down to the preselected
temperature if this is lower than 20°C / 68°F.
During the standby cooling, the preset temperature is displayed.
37.2

Precooling of the rotor

For quick precooling of the unloaded rotor and the accessories, it is a good idea to do a centrifugation run with
the continuous operation setting and a speed of about 20% of the maximum rotor speed.
The centrifugation run for pre-cooling the rotor is done automatically with the program PREC (PRECOOLING).
A centrifugation run for pre-cooling the rotor cannot be carried out if program linkages are used.

Press the key. The LED in the

Press the key to end the centrifugation run. Run- down is carried out with the selected run- down
OPEN / STOP
parameters. The run-down parameter is displayed e.g.
Once the rotor has come to a standstill, the LED in the
displayed. The right-hand LED in the
starts blinking and continues blinking until the lid is opened.
During the centrifugation run, the rotor speed or the RCF value, the temperature in the centrifuging chamber and the
remaining or elapsed time are displayed.
37.3

Time-controlled cooling

If necessary it can be set so that cooling begins after a certain amount of time once centrifugation run has been
started.
The delay time can be set in 1-second increments from 15 to 900 seconds. If no time delay is required, set to "0". No
delay time is set ex works.
When the rotor is at a standstill, the delay time can be set as follows:
You can scroll backwards through the menu by pressing the
The operation can be cancelled at any time by pressing the
stored.

Keep the key held down for 8 seconds.
PROG
After 8 seconds,  Machine Menu  appears in the display.

Press the key as often as necessary until the ->Settings is displayed.
PROG

Press the key. The SOUND / BELL = off/on is displayed.
START

Press the key as often as is needed until the delay time is displayed, e.g. Cool acc time = 0.
PROG

Use the adjusting knob

0 = no delay time

Press the key to save the setting.
START
Briefly, Store Settings ... is displayed as confirmation, followed by -> Settings.

Press the key once to exit the "Settings" menu or press the
OPEN / STOP
"Machine Menu".
78/195
key blinks until the rotor has been imported, it is subsequently lit.
key also switches off, the left LED in the
OPEN / STOP
to set the value you want.
Rev. 12 / 04.2020
9. The right-hand LED in the
key switches off and OPEN
key.
T/°C
key. In this case, the settings are not
OPEN / STOP
key twice to exit the
OPEN / STOP
key is lit.
OPEN / STOP
OEFFNEN is
key
OPEN / STOP
AB4701DEENFRIT