Alexika T 25 digital ULTRA-TURRAX: Drive Useful information

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Drive Useful information

The speed is set by using the differently adjusting 

wheel. The motor speed can be read off the LED 

display. For example, a value of 13.6 corresponds 

to 13,600 rpm.

The drive unit opens up a wide range of possibili-

ties for dispersion technology in the conventional 

laboratory with a respective performance output 

of approximately 500 watts at 25,000 rpm.

The dispersion effectiveness is heavily dependent 

on the product of the shear gradient and the time 

the particles spend in the shear zone. The opti-

mum range for the circumferential velocity of the 

rotor/stator arrangement is 6-24 m/s.

A processing time of a few minutes is usually 

sufficient to produce the desired fineness. Long 

processing times bring only insignificant impro-

vements in the obtainable fineness; the energy 

expended serves merely to increase the tempera-

ture of the medium.

Dispersion is the dissolution and diffusion of a so-

lid, liquid or gaseous phase in a liquid that is not 

consolute with that phase.

The rotor/stator principle

Due to the high rotation speed of the rotor, the 

medium to be processed is automatically drawn 

axially into the dispersion head and then forced 

radially through the slots in the rotor/stator arran-

gement. The high accelerations acting on the ma-

terial produce extremely strong shear and thrust 

forces. In addition, high turbulence occurs in the 

shear gap between rotor and stator, which provi-

des optimum mixing of the suspension.

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Assembly of boom and stand

To ensure safe operation the driving unit is faste-

ned to the plate stand R 1826 (pos. 5) by means 

of a cross sleeve (pos. 3).

In order to enhance the stability of the mecha-

nical arrangement, the driving unit has to be 

mounted as close as possible to the stand pillar

The delivered extension arm is mounted as fol-

lows (overview fig. 1):

• Insert extension arm (pos. 1) into flange

• Screw in the cheese head screw  (pos. 2)

•  Firmly  tighten  cheese  head  screw    (pos.  2) 

   using the DIN 911 A/f 4 screwdriver

Vibrations may cause the cylinder head screw 

(pos. 2) to loosen. Therefore, for your own sa-

fety, periodically check that the extension arm is 

secure. If necessary, retighten the cylinder head 

screw (pos. 2).

Fig. 4