LABEC Z-L-450 - Manual (Page 9)

4.4 Close the door
Press the door cover until door hook of front upper of door cover hooks the lock dowel and you can
hear sound like "crack" twice. The bottom of door hook will touch the over travel-limit switch and then the
door is locked.
Please press the door cover properly. Don't overexert,
or the hook will be damaged.
4.5 Installing the rotor
The rotors should be confirmed and designated by our company, otherwise it may cause problem. The
list of types of rotors designated by our company is attached in this manual. We suggest users using the
designated rotors of this manual. (Please check "rotor type and technical parameters" for more details)
Inappropriate type of rotors and centrifuge tubes will lead to poor effect,
or even the damage of the centrifuge.
Steps to install the rotor is as following (indicated in Figure 5):
● Switch on and wait until finish the self-examination.
● Press“ DOOR/STOP” button, and open the door cover and make sure the cleaning and non-foreign body
of the cavity
● Clean the surface of the motor spindle.
● Prepare the rotor you will need, hold the rotor in hand, aim the Rotor central bore at the motor spindle,
lower vertically until it reaches the bottom of the cone. Let your hands go and press the rotor downward.
● Please use tool to disassembly the rotor, just tighten up the locknut in a direction of clockwise.
4.6 Calculation of rotor load
● Calculation of maximum rotor load
There is huge centrifugal force when the Low-speed table-top centrifuge is running with high-speed.
The design of each rotor requires sufficient mechanical strength under maximum rated speed. That is "safety
factor ", however, this "safety factor" requires that the load of the rotor shouldn't exceed its maximum rated
load.
If you are separating the sample, please put the sample into the container and then put them into rotor.
If the sum of sample and container exceed the maximum rated load of the rotor, you shall reduce the weight
of the sample or calculate the allowed-speed of the rotor (NPERM) to make sure that the load of the rotor
won't exceed its maximum rated load.
The calculating way of allowed-speed of rotor is as following:
NPERM=Nmax×（maximum permissible load÷actual load）×0.5
Nmax：Maximum rated speed
Don't use the rotor overload, or it will cause explosion of the rotor
and the debris will damage the centrifuge.
4.7 Filling of sample in the centrifuge
Please carefully examine that whether the centrifuge container using (centrifuge tubes, etc.)is consistent
with its rated maximum allowed acceleration (centrifugal force), if possible, please lower the speed. When
the centrifuge is running, if the balance performance is better, the separated area of the separating samples
won't interface with each other because of the vibration, and then the effect of centrifuge will be better.
Please try to keep balance when filling centrifuge with samples to get good effect of balance during running.
Choose proper container for placing samples please.
Please note the using life of the centrifugal container. Check whether the centrifugal
container (plastic, glass) is damaged or not when it's under maximum allowed load
and maximum allowed speed. If there's anything damaged, please replace in time.