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7. CALCULATIONS
7.1 CALCULATION OF CENTRIFUGAL FORCE
For the calculation of the centrifugal force (RCF), stated as a multiple of the gravitational force
"g", use the following formula:
2
RCF = 11.18 x r x ( n / 1000 )
RCF ......... Relative centrifugal force (xg)
r ............... Radius of the rotor (cm)
n ............... Rotational speed (RPM)
7.2 CALCULATION OF MAXIMUM PERMITTED ROTOR SPEED
Users are responsible and must consider the limitations for maximum permitted rotor speed and
about correct rotor load.
The maximum permitted speed for each type of rotor is marked on each rotor. It is defined for
3
the use of samples with maximum density of 1.2 g/cm
.
If you need to use higher density samples, maximum permitted rotor speed must be reduced
according to the following formula:
½
2
M = ( 1.2 x n
/ S )
M .............. Reduced maximum permitted rotor speed
3
n ............... Maximum permitted rotor speed for samples with density of 1.2 g/cm
S .............. Density of used sample
8. TECHNICAL SERVICE
Web Resources
Visit the VWR website at
www.vwr.com
for:
• Complete technical service contact information.
• Access to VWR Online Catalogue, and information about accessories and related products.
• Additional product information and special offers.
Contact us
For information or technical assistance contact your local VWR representative or visit
www.vwr.com.
23
vwr.com I EN Instruction manual VWR
®
MICRO STAR 30R
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