Ultra-Centrifugal Mill Model ZM200

Ultra-Centrifugal Mill

Model ZM200

High-speed power for excellent grinding results
With the new Ultra-Centrifugal Mill ZM 200 we are now offering a mill with unrivaled performance. The new Powerdrive ensures higher performance with increased torque. Even with temporary overloads, the machine reacts with a powerful throughput. This means that the size reduction process is particularly effective. The extremely rapid reduction in size increases the sample throughput in the laboratory and, in combination with the 2-step rotor/screen pulverization system, is also extremely gentle on the material.

ADVANTAGES

New, particularly efficient Powerdrive for powerful grinding and high grind fineness
Considerably higher throughput in comparison to other centrifugal rotor mills thanks to the optimally matched frequency converter and the 3-phase motor
Motor compartment and electronics fully protected against dust and material penetration
Gentle and very rapid size reduction by 2-step rotor/screen system
Quiet and reliable, easy to clean
Wide speed range: 6,000 – 18,000 min-1
Graphical performance data display
Comfortable parameter setting via display and ergonomic 1-button operation
Safety plastic housing with automatic cover closure
Universal use thanks to comprehensive range of application-related and performance-increasing accessories
Electronic safety and diagnosis system

The new Ultra-Centrifugal Mill ZM 200 is used for the rapid reduction in size of soft to mediumhard and fibrous materials. As a result of the effective pulverization technique and the wide range of accessories the ZM 200 ensures the gentle preparation of analytical samples in a very short time.

The suitability of the ZM 200 for universal use is shown by the following examples:

Chemicals, drugs, spices, coal, synthetic resins, plastics, pharmaceutical raw materials and finished products, fertilizers
Sample batch production of customized powder coatings
Washing powder for the determination of surfactants
Foods and feeds for the determination of the nitrogen and protein content
Plant constituents for environmental studies
Preparation of bones for implants

The Ultra-Centrifugal Mill can be used for both quality control, R&D and small-scale production. Because of its large range of accessories and the possibility of individually setting the speed, the ZM 200 can be optimally adapted to suit any size reduction task. The feed material is introduced either manually or via an optional loadcontrolled vibratory feeder (DR 100). Automatic material feed guarantees particularly uniform grinding results. The ground sample is collected in a cassette, a collection tray or in a paper filter bag via a passage receptacle. The innovative cassette principle ensures easy material removal and avoids crosscontamination.
For grinding larger volumes we recommend the use of the cyclone with a 3000 or 5000 ml collector. If either the cyclone or the paper filter bag is used, the ground sample is additionally cooled by the air stream and discharged more quickly from the grinding chamber. The push-fit rotors can be removed, cleaned and replaced without the use of tools.


Controlled and uniform material feed: ZM 200 with Vibratory Feeder DR 100	Automatic size reduction of large volumes: ZM 200 with Vibratory Feeder DR 100 and Cyclone

SPECIFICATIONS
Performance data
Applications	fine grinding
Field of application	agronomy, chemistry, biology, medicine, pharmaceuticals, plastics, foods, environmental, construction materials
Feed material	soft, medium hard, brittle, fibrous
Feed size	up to 10 mm
Grind size*	< 40 µm
Sample volume/throughput	max. 900 ml; with cyclone up to 5000 ml
Speed range	6,000 - 18,000 min-1, freely selectable
Technical data
Power consumption	approx. 1300 W (VA)
Dimensions (WxHxD)	410 x 365 x 515 mm
Net weight	approx. 38 kg
*depending on sample

MAX OPERATING CONVENIENCE

The ZM 200 is very simple and safe to use. The parameters are easily set via the graphics display and 1-button operation. In this way all the relevant data can be comfortably entered or recalled, e.g.:

Speed
Drive load
Operating hours
Error messages in clear text
Service intervals

The user is guided through the menus with multi-language options. The electronic safety and diagnosis system virtually rules out operator errors.

ROTORS AND RING SIEVES

The push-fit rotor and ring sieves should be selected according to the properties of the sample, both feed size and the required grind fineness, and the subsequent analysis. The selection of the aperture size of the ring sieves depends on the required grind fineness and the sample. With most materials approx. 80% of the total sample achieves a fineness of less than half the aperture size of the ring sieve used.
Temperature-sensitive and brittle materials, such as powder coatings and resins, can be pulverized particularly well with the distance sieves specially designed for this purpose. Soft and elastic products, such as plastics, which normally cannot be processed at room temperature, can be fed into the mill after prior embrittlement with liquid nitrogen. By using the new ring sieves with slot openings, many plastics can now be reduced in size without any prior embrittlement.
For grinding small sample volumes, particularly in the pharmaceuticals sector, grinding tools for small volumes are available; these are made from corrosion-resistant steel 1.4404 (316). For heavy-metal-free size reduction of non-abrasive substances we recommend the use of rotors and ring sieves made from titanium together with cassette bases with a titanium-niobium coating and plastic cassette covers. The wide range of accessories with rotors, ring sieves and different types of collection systems, allow the optimal adaptation of the ZM 200 to suit various special applications.

Materials

Rotors and ring sieves made of the following materials are available:

Stainless steel
Stainless steel with hard metal coating
Titanium
Steel 1.4404

ROTOR SELECTION GUIDE
Rotor	Application
6-tooth rotor	Coarse, bulky, fibrous materials such as animal feed pellets, hay and straw
12-tooth rotor	Medium-coarse materials such as wheat, oats, corn, tablets and powder coatings
24-tooth rotor	Fine materials such as chemicals, coal and sugar
8-tooth mini-rotor	Specially for size reduction of small sample volumes up to 25 ml
Wear-resistant coating	For harder, abrasive substances
Titanium rotor	Heavy-metal-free grinding of non-abrasive materials

ZM 200 TECHNOLOGY

In the Ultra Centrifugal Mill, grinding takes place by impact and shearing action between the rotor and the fixed ring sieve. The feed material passes through the funnel with splash-back protection onto the rotor. The centrifugal acceleration throws it outward with great energy and it is pre-crushed on impact with the wedge-shaped rotor teeth moving with a high differential speed. It is then finely ground between the rotor and the
sieve ring. This two-stage grinding ensures particularly gentle but fast processing. The feed material only remains for a very short time in the grinding chamber. As soon as it is finer than the aperture width of the sieve used, it is collected in the collecting vessel enclosing the grinding chamber or in the downstream cyclone or paper filter bag.

CAT. NO.DESCRIPTION
20.823.0001	Ultra-Centrifugal Mill ZM 200 for 230 V, 50/60 Hz with 900 ml cassette (please order push-fit rotor and ring sieves separately)
20.823.0002	Ultra-Centrifugal Mill ZM 200 for 110 V, 50/60 Hzwith 900 ml cassette (please order push-fit rotor and ring sieves separately)
20.823.0003	Ultra-Centrifugal Mill ZM 200 for 120 V, 50/60 Hz with 900 ml cassette (please order push-fit rotor and ring sieves separately)

ZM 200 – powerful, safe, universal

Rotors and ring sieves
The selection of the push-fit rotors and ring sieves depends on the properties of the sample, the required final fineness and the subsequent analysis. The selection of the ring sieve aperture size depends on the required final fineness and the feed material. With most materials approx. 80% of the total sample achieves a fineness of less than half the aperture size of the ring sieve used. Rotors and ring sieves are available in various materials and types. The reinforced rims provide the ring sieves with greater stability. Temperature-sensitive, brittle materials such as powder coatings and resins are particularly easy to grind with the distance sieves that have been specially developed for this purpose.
Rotors and ring sieves with an abrasion- resistant coating are used for reducing the size of abrasive substances such as fertilizers. For heavy-metal-free size reduction of non-abrasive materials we recommend the use of rotors and ring sieves made from titanium together with cassette bases and covers with a titanium-niobium coating.	Thanks to the wide range of accessories with rotors, ring sieves and different types of collection systems, the ZM 200 can be easily adapted to suit a wide variety of applications.
Rotor selection guide
Rotor	Field of application
6-tooth rotor	coarse, bulky, fibrous goods such as feed pellets, hay and straw
12-tooth rotor	medium-coarse goods such as wheat, oats, corn, tablets, powder coatings and plastics
24-tooth rotor	fine goods such as chemicals, coal and sugar
8-tooth mini-rotor	specially for size reduction of small sample amounts up to 20 ml

	Accessories for grinding small volumes
	In many fields, e.g. in the pharmaceutical industry, the required sample amounts are very small. Therefore the ZM 200 is now available with a minicassette for small sample volumes of up to 20 ml which is used in combination with the 8-tooth mini-rotor. The loss-free recovery of smaller amounts of sample is made easier by the reduced cassette diameter. Suitable ring sieves are available with aperture sizes from 0.08 to 2.00 mm.	If the grinding tools for small volumes are used in the ZM 200 only a small labyrinth disk is required. The necessary accessories are available as a conversion kit. All parts coming into contact with the sample, including the cassette and ring sieves, are made from corrosionresistant steel 1.4404 (316).