13
4.4. RUNNING THE PROGRAM
Switch on the centrifuge, see that the on/off switch led turns on.
See that the control panel activates.
Load your samples to the rotor and close the lid.
You can run the centrifuge in two different ways,
You can make a new program (see section 5.3)
You can select a program from the memory
PRE-COOLING
While operating the NF 1200 R centrifuge at sub-ambient temperatures, in order to get the
maximum performance, without loading the rotor run the centrifuge at 1.500 rpm, at a temperature
which is 3° C lower than the required temperature and at hold position until you see that the
temperature inside the bowl drops to the required temperature. Then, stop the centrifuge, load your
samples and start centrifugation.
4.4.1.
SELECTING THE MEMORIZED PROGRAM
Select the requested program number at stand-by position by pushing value increase and
decrease keys. All values related to the selected program will be shown on the relevant displays.
Check that all values are correct.
Load the rotor with samples by paying attention to the dynamic and static balances.
Close the lid, see that the lid open warning led (11) turns off.
Push START key (6) and see that the start led (10) turns on.
The rotor starts accelerating according to the set value and the acceleration led turns on. The
set speed or RCF value is displayed during the set time duration. (RPM or RCF screen will
appear in every 3 seconds). For the operations whose speeds are higher than 2.000 rpm, the
rotor accelerates according to the set acceleration value up to 2.000 rpm and then continues
accelerating with the highest acceleration value, 9 to reach the set speed. As the speed
reaches the se
t value, “-“ sign appears on the acc/brk/temp display (3). (The NF 800 R shows
the bowl temperature on the acc/brk/temp display until the centrifugation ends)
The elapsed time is counted down as the centrifugation starts.
When the time display shows “00”, the program ends, the breaking led turns on and the set
break rate is shown at acc/brk/temp display (3). The rotor brakes with the highest break rate, 9
until it slows down to 2.000 rpm and continues braking according to the set braking value.
The elapsed time until the rotor stops is counted and is shown at the time display. This is the
time that passes until the rotor stops.
When the speed display shows ”0000”, the start led (10) turns off, the “end” expression
appears and the lid led (9) turns on. The user is warned by an intermittently sounding alarm.
Push the LID button (8) to open the lid.
You may leave the centrifuge at stand-by position.
NOTE 1 :
You may display the RPM or RCF value on the speed display during the run by
pushing the function button.
NOTE 2 :
You may see all set values during the run by pushing the value increase key.
