Fritsch Pulverisette 7 Planetary Micro Ball Mill Planetenmühle Kugelmühle Retsch

Manufacturer: Fritsch

Model: Pulverisette 7 Planetary Micro Ball Mill classic line

P/N: 07.4000.00

S/N: 07.400/275

Description:

The Pulverisette 7 classic line with 2 working stations is ideal for smallest quantities and best suited for fast, uniform, and extremely fine comminution of very small samples down to colloidal fineness of hard, medium-hard, brittle and moist samples. Depending on the desired final fineness can the grinding be performed dry or in suspension. Besides for comminution, the Planetary Ball Mill can be utilized for mixing and homogenizing of emulsions and pastes.
Comminution according to the Planetary Principle:
The comminution of the material to be ground takes place primarily through the high-energy impact of grinding balls. To achieve this, the grinding bowl, containing the material to be ground and grinding balls, rotates around its own axis on a main disk whilst rotating rapidly in the opposite direction. At a certain speed, with this configuration, the centrifugal force causes the ground sample material and grinding balls to separate from the inner wall of the grinding bowl. The grinding balls then cross the bowl at high speed and further grind the sample material by impact against the opposite bowl wall. In addition, impact between the balls themselves on the sample material adds to the size reduction process. Due to the enormous rotational speed of the main disk – up to 800 rpm – the Pulverisette 7 classic line reaches a centrifugal acceleration of up to 50 g.
Particularly high grinding performance – low bench space requirements:
The special microprocessor control with up to 99 programmable repetitions of the grinding cycle ensures exceptionally fast, precise, reproducible results. A mill that combines particularly high grinding performance with low bench space requirements!

Features:

- Fast fine grinding with rotational speeds up to 800 rpm
- Loss-free comminution also below 1 µm
- Uniform extremely fine comminution of smallest sample amounts
- Useful capacity up to 2 x 20 ml
- Rotational speed up to 800 rpm - precise rotational speed regulation with display of set/actual values
- Fast fine grinding of small quantities
- Small footprint
- Simultaneous processing of 2 samples
- Useful capacity up to 2 x 20 ml
- Programmable microprocessor control
- Up to 99 repetitions of the grinding cycle
- Programme-timer for grinding operation and cooling phases
- Reversing function
- Energy-save function (electricity-saving mode)
- RS232 interface for output of process data and programming cycles
- Grinding chamber completely encapsulated, but easy to open
- Cooling of the grinding chamber with a built-in fan for long grinding times
- Ergonomic IP64 membrane keyboard
- Maintenance-free drive with asynchronous motor and frequency converter
- Extensive accessories for simplifying your daily work

Specifications:

- Working principle: impact force
- Optimal for material type: hard, medium-hard, brittle, moist
- Number of working stations: 2
- Grinding tools:  grinding bowls and grinding balls
- Materials of the grinding tools: agate, sintered corundum, silicon nitride, zirconium oxide, hardened stainless steel, hardmetal tungsten carbide, polypropylene
- Grinding bowl sizes: 12, 45 ml
- Grinding ball diameter: 0.1 - 15 mm
- Max. feed size (depends on material): 5 mm
- Min. sample quantity: 0.5 ml
- Max. sample quantity: 40 ml
- Final fineness (depends on material): < 1 µm
- Typical grinding time down to analytical fineness: 3 min
- Grinding process: dry/wet
- Grinding in inert gas: only possible in glove box
- Rotational speed of main disk: 100 - 800 rpm
- Transmission ratio planetary disk / grinding bowl: i relative = 1 : -2
- Effective diameter of main disk: 140 mm
- Centrifugal acceleration (g = 9.81 m/s²): 50 g
- Interfaces
- Electrical details: 230 V/1~, 50-60 Hz, 880 Watt, 8.8 - 3.7 A
- Emission sound pressure level at the workplace according to DIN EN ISO 3746 (depending on the material to be ground, grinding bowls/balls, selected rotational speed): up to approx. LpAd = 82 dB
- Dimensions (W x D x H): bench top instrument 37 x 53 x 50 cm

Items delivered:

- Fritsch Pulverisette 7 Planetary Micro Ball Mill classic line
- Instruction Manual as PDF via E-Mail request

Condition:

This Planetary Micro Ball Mill is in excellent cosmetic as well as working condition. It is 100% functional tested and ready to be applied.