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HAVER & BOECKER
Two sample dividers –
Always an exact result

Exact sample division

The basis of a good analysis

Stones and soils, granulates, fertilisers or seeds – no matter which bulk material you want to analyse for particle size: first of all, you always need a representative sample quantity.

For an exact sample division Haver & Boecker offers you two options:

  • The HAVER sample splitter suitable for dividing samples into 2 different sizes and 6 possible passage widths. Depending on the nature of the particle sample, the collection tray is plastic-coated or made of tinplate.
  • With the HAVER rotating sample splitter you can choose between three different dividing heads — depending on the feed quantity and particle size.

"Your analysis only becomes meaningful through the exact sample preparation."
Josef Robben, Product Manager Particle Analysis

HAVER sample splitter

Sample division in a ratio of 1:2

If you want to reduce larger samples, we recommend the corrugated roll unit under the following conditions:

  • Stones and soils
  • Ceramic balls
  • Granules
  • Fertiliser and seeds

You can obtain the sample divider in two different sizes and, depending on the material to be screened, with 6 differently dimensioned outlets.

This is how you proceed:

  1. feed in the material so that it passes evenly through the dividing head into the collecting trays. The partial head consists of a number of cells open at the top and bottom, the passages of which are arranged alternately.
  2. The material sample applied evenly over the length of the riffle divider is divided over the entire "cross-section". The narrower the cells of the partial heads, the better the division. Which dividing heads you need depends on the maximum grain size of the sample.
  3. Discard one of the two resulting sub-samples and divide the other down several times in the same way until you have reached the quantity required for analysis.

Technical data

Features RT 75 RT 50 RT 37,5 RT 25 RT 12,5 RT 6.3
passage width [mm] 75 50 37,5 25 12,5 6,3
passage number 6 8 12 16 18 12
Max. feed grain size [mm]* approx. 50 approx. 33 approx. 25 approx. 16 approx. 8 approx. 4
Capacity of the collection tray [litres] 8 8 8 8 1.7 /2 1.7 /2
Material of the dividing head galvanized sheet steel galvanised sheet steel galvanised sheet steel galvanised sheet steel stainless steel stainless steel
Dimensions [mm] 620 x 260 x 420 620 x 260 x 420 620 x 260 x 420 620 x 260 x 420 300 x 250 x 270 300 x 250 x 270

Your advantages at a glance:

  • Representative test samples
  • Avoidance of cross-contamination due to the smooth surface of the plastic-coated drip trays
  • Simple and inexpensive sample division

HAVER rotating sample splitter

Sample division in the ratio 1:8, 1:10 or 1:30

Do you need small, representative sample quantities of solids or do you have to divide difficult flowing material with high precision? We recommend the HAVER rotating sample splitter for the following materials:

  • Stones and soils
  • Ceramic balls
  • Granules
  • Fertiliser and seeds

The sample splitter combines three division methods in one unit and offers the best possible and most accurate sample division today. Its areas of application are laboratories in research, development and process monitoring. All elements of the HAVER rotating sample splitter are made from food-safe materials manufactured, easy to clean and equipped with a low-maintenance drive motor with a slip clutch.

This is how the rotating sample splitter works:

  1. The sample is fed via an integrated, infinitely variable vibrating feeder to a dividing cone whose shape corresponds to quarters and cones. On its outer surface, the sample material is accelerated outwards by rotation and divided into up to 30 individual streams by guide channels.
  2. The individual samples arrive in glass screw-top vials of 15 ml, 250 ml or 500 ml, which you can fix easily and securely using quick-release clamps. Due to the rotation and the number of dividing channels, variable dividing ratios and up to 3,000 dividing steps per minute are possible.
  3. Thus, each sample is ultimately composed of a very large number of individual samples – a characteristic feature of exact sample division.

Technical data

Features HAVER RPT 1:8 HAVER RPT 1:10 HAVER RPT 1:30
Max. sample volume 4000 ml 2500 ml 300 ml
Max. particle size 10 mm 10 mm 2.5 mm
Funnel* 10 mm dia. 10 mm dia. 5 mm dia.
Dimensions 609 x 383 x 660 mm (L x W x H) 609 x 383 x 660 mm (L x W x H) 609 x 383 x 660 mm (L x W x H)
Mains voltage 230 volt or 110 volt transformer 230 volt or 110 volt transformer 230 volt or 110 volt transformer
Frequency 50-60 Hertz 50-60 Hertz 50-60 Hertz
Weight approx. 30 kg approx. 30 kg approx. 30 kg

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Your advantages at a glance:

  • Representative sample division in the ratio 1:8, 1:10 or 1:30
  • Simple operation
  • An adjustable feeder trough integrated in the system with a continuously adjustable vibration intensity
  • Avoidance of inhomogeneities and segregation
  • Easy material flow due to the high rotation speed of the cone (approx. 100 rpm.)

Preparation is everything

Your analysis only becomes meaningful through exact sample preparation. First of all, you always need a representative sample quantity for this.

If you want to obtain your materials in bags, boxes and other large containers obtained, the quantity is usually far too large to analyse with the aid of sieving or dynamic image analysis. Therefore, from the complete amount of material, you should make a cross section as a basic sample and only then start dividing the sample.

Often samples are also directly in production taken from the current material flow. You should bear in mind that the different grain sizes of your material are never evenly distributed in the natural flow.

Therefore only one flow cross-section ensures that you get a representative distribution of the actual grain sizes. 


The following video shows the natural flow behaviour using sand as an example.

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Do you have any questions?
We will be happy to help you:
Your Team of experts
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HAVER & BOECKER OHG
Particle Analysis
Ennigerloher Str. 64
59302 Oelde, Germany