LABEC Z-L-450 - Manual (Page 10)

4.8 Use the rotor in safe way
4.8.1 Fill samples and place the test-tubes exactly and symmetrically before the running of rotor.
4.8.2 Angle rotor shouldn't run in the critical speed area of 800r/min for long time, otherwise the big vibration
caused by the machine will impact using life.
4.8.3 When replacing rotors, loose the locknut anti-clockwise with the wrench attached, and then you can
replace rotor.
Don't start the machine before the screw is tighten on the shaft.
4.8.4 If you need use the centrifuge repeatedly, please check whether the rotor locknut loose or not after
several times. If the locknut is loose, you must tighten the screw and then start the machine
4.8.5 The centrifuge tubes can load the samples at different time but it must be symmetric loading of
samples (the weight of error allowed ≤ 1.5g). Start the machine with asymmetric loading is not allowed!
4.9 Example of operating of parameter setting
4.9.1 The operation is as following if the rotor is No. 0001: power on→switch on the right side of the device,
and at this time the control panel will light on.
Setting the parameters as following:
Rotor No. Speed r/min Time: min/sec.
1 4000 10
4.9.3 Setting of speed: Press the SPEED button→make the number flash on the SPEED →Press the ▲
▼button to set the speed 4000.
4.9.4 Time setting: Press the TIME button→make the number flash on the TIME →Press ▲ ▼button to set
the time 10.
4.9.5Setting RCF: Press RCF button→SPEED / RCF value is displayed as the
centrifugal force →Press the
▲ ▼button to set. Just set a centrifugal force or speed can be.
4.9.6 During the process of setting parameters, if there is alarm caused by machine fault or incorrect setting
on the parameters, press the ENTER stop key to cancel the alarm.
4.9.7 Press the START key, the machine will begin to run (if you need stop it halfway, please press
DOOR/STOP key), time setting will reduce from set value to zero, when it shows zero, the centrifuge will
stop working. And at this time, the speed will reduce from set value to zero (the time for speed reduce from
set value to zero has nothing to do with the setting of speed down) when the speed is zero, the door cover
will open automatically and the machine will buzz for 5 times, please press the ENTER key to stop the buzz
and centrifugal process is completed.
4.9.8 If you need short time centrifugal, please press start key SHORT for long time, and the speed will
increase gradually. It will stop when you release and the maximum speed is the setting speed of the rotor.
4.9.9 The machine speed is stable, can be modify the speed / centrifugal force and time parameters, Press
ENTER key to set the parameters to confirm.
Note:
● Install the rotor on the shaft correctly before setting parameters on the control panel.
● You can reset the parameters if the operation of parameters-setting is wrong.
4.9.10 About calculation of the centrifugal force
Relative centrifugal force is usually thousands of times of gravity (g). It's unit items to measure the
efficiency of variety of instrument separation or precipitation. The calculation of centrifugal force has
something to do with centrifugal speed and centrifugal radius. It's based on the following equation: