Nahita 2818, Руководство пользователя

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Model 2818
Rotor Fixed angle (not included)
Automatic detection of rotor Yes
Temperature -10 ºC to 40 ºC (
±
2 ºC)
Timer 0-9 h 59 min
Memory 5 programs
Acceleration rate 3 levels
Braking rate 4 levels
Other functions Quick spin, pre-cooling
Motor
Induction, maintenance-free
Noise < 68 dB
Power 220-230 V, 50 Hz
Dimensions 74x38x38 cm
Weight 60 Kg
3. TECHNICAL SPECIFICATIONS
Maximum speed according to rotor
Centrifugation is a separation technique based on the movement of the particles that are
displaced to the distal end of the rotation axis depending on their shape and mass.
The Relative Centrifugal Force (R.C.F.) is the required force to separate particles. It is
given as some value times that of gravity (g).
The R.C:F. is calculated with the following formula:
1.118·10 -5 is a constant.
r= radius, the horizontal distance in centimetres
from the rotation axis to the bottom of the sample tube.
n= rotation speed expressed in revolutions per minute (r.p.m.).
F.C.R.= 1.118·10-5·r·n2
Code 92818000 92818001 92818002 92818003 92818004
Capacity 12x1.5 mL 24x1.5 mL 12x5 mL 12x10 mL 6x50 mL
Max. speed 18000 rpm 15000 rpm 15000 rpm 12000 rpm 10000 rpm
Max. RCF 21300 g 20600 g 18600 g 13000 g 10500 g
4. THEORETICAL FOUNDATIONS
Page 18 Instruction manual 52818000 Version 1 Jul.-08
Axis of rotation
Radio of draft
Pre-cooling function
This function allows the centrifuge chamber to reach quickly the pre-selected tempera-
ture. For this purpose:
- Once temperature has been set press the pre-cooling function button (2.16) .
- The rotor will spin at 3000 rpm and the timer will start counting up. The tem-
perature inside the centrifuge will go down quickly until reaching the pre-selected tem-
perature; once it has been reached, the rotor will go on spinning to keep it.
Note: To allow the rotor itself reach the pre-selected temperature pre-cooling time must
be longer. The larger the rotor is, the longer the time must be.
Note: if temperature decreases slowly, check that the ventilation grilles of the quipment
are completely free of obstructions
To start with the centrifugation protocol, press stop (2.19) and then start (2.18) .
Programs
The centrifuge 2818 presents a memory to store up to 5 different centrifugation pro-
grams. To save a program, proceed as follows:
Select the parameters of the protocol to be saved.
Press Prog. button of the program selection buttons
(2.14)
Then, press the number in which the program is going to be saved.
To select a program preciously saved, press the corresponding button number and the
different parameters will be displayed.
Rotor detection
Once it is operating, the centrifuge detects the rotor used and shows its corresponding
number (Rn) on display (2.13) . If pre-selected speed is not adequate for the rotor used, the
centrifuge will stop automatically and will display the error.
Rotor chart
Number Descripción Capacity Max. speed (rpm)Max. RCF (g)
R0 Rotor waiting to be detected
R1 Fixed angle rotor 45º 12x1.5 mL 18000 21300
R2 Fixed angle rotor 45º 24x1.5 mL 15000 20600
R3 Fixed angle rotor 32º 6x50 mL 10000 10500
R4 Fixed angle rotor 45º 12x5 mL 15000 18600
R5 Fixed angle rotor 30º 12x10 mL 12000 13000
Version 1 Jul-08 Instruction manual 52818000 Page 23
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