LABEC Z-L-530 - Manual (Page 10)

4.3 Open the door
Press " " button of the control panel and the door cover will eject automatically to a certain height,
then you need lift the cover to open the door completely. You will see the cavity of the centrifuge. You can
remove the rotor and package for the first-using of the new machine.
Note: While opening, the door cover will spring to certain height automatically, please prevent your
head or any thing else from the upward side of the door cover to avoid dangers! If it goes wrong and door
cover can't open automatically, but you have to remove the materials out from the cavity, you can open the
door manually. Please check “troubleshooting” for more details.
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 overtravel-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)
Please use the dedicated Hexagon wrench from the package when you are installing the rotor.
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 (inner hexagonal wrench) to disassembly the rotor, just tighten up the locknut in a direction
of clockwise.
Then we complete installation of rotor. Before or after using, please check whether
installed position of rotor change or not. And if necessary, please re-tighten the
screw to ensure solid installation of the rotor.
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