Precise, maintenance-free solid flow meter for good flowing granular and powder products.

We work with you to optimise the process transparency and continuous batching and dosing operations.

Place your request for a quotation now and we will be pleased to give you individual advice on your solid flow measurement application.

FlowSlide Durchflussmessung Durchflusswaage Dosierung Schüttgüter präzise robust Freifall Messung Feststoffe Granulat rieselfähig

Immediate advice: +49 (0) 29 61 – 96 56 86

B + B Anlagentechnik

Degussa Krefeld

Ruhrkohle AG

Steag RWE

The added value to you



Measurement is almost independent of grain size and density



The FlowSlide system is factory (pre)calibrated



No periodical maintenance required



Outstanding reproducibility and accuracy

Why is the FlowSlide system the right choice for my plant?


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With the benefit of our many years of experience we help you to select the right solid flow meter for your application.

Place your request for an offer now and we will be pleased to help you:

+49 (0) 29 61 – 96 56 86

You are probably familiar with the following situation:

You need a reliable flow meter for free-flowing granular or powder.

You would like to make continuous measurements, mix and dose or load silo trucks.

The device should be maintenance-free and offer excelllent accuracy independently of the characteristics of the product.

The ideal solution:

The FlowSlide measurement system allows you to measure all free-flowing, solids precisely and free of maintenance.

The device measures the flow rate of solids in „free fall“ by means of the centrifugal force. This force is directly proportional to the mass.

The measuring range of the different FlowSlide sizes starts at 30 kg/h and ends at 300 t/h.

How does the FlowSlide system work?

In the FlowSlide the product to be measured is guided over a circular slide.

This generates a centripetal force, which is directly proportional to the mass flow (kg/h).

Due to the specific force transmission, the influence of the frictional forces is cancelled out along the measurement slide. The measurement is largely independent of the product density, grain size and elasticity.

Auswerteelektronik FlowSlide Amplifier Verstärker Messverstärker Waage Durchflussmessung
Technical data

Grain size range:
0 – 30 mm

Product density:
40 – 3.500 kg/m³

Sensor accuracy class:
C3 – 3,000 parts

Sensor power supply
5 – 15 VDC (via electronics)

Sensor protection class:

System accuracy:
+/- 0.5%

+/- 0.1%


In contact with product:
Stainless steel or Hardox 400

Aluminium – optional: stainless steel or plastic

Total height:
Baby FlowSlide = 395 mm /
FlowSlide = 700 mm /
Maxi FlowSlide = 1,050 mm

Measurement ranges:
1 / 5 / 25 / 50 /
80 / 150 / 300 m³/h


Illuminated colour graphic display
kg/h, kg (t) absolute, trend display

110 – 240 VAC or 12 – 30 VDC

Full Bridge STRAIN GAUGE sensor / inputs for “tare” and “start batch”, etc.

Counting pulse per kg or t / 4 – 20 mA/ output for dust cleaning activation

RS 232 / RS 485 / Profibus DP/
Profinet / Modbus TCP /
Wi-Fi / dosing/batching contacts

Stainless steel

Type of protection:

Type of mounting:
Wall, table or panel mounting

Working temperatures:
-10°C to +40°C

Upon request, we will gladly send you a series of information about our products, starting with the access to our data sheets.

Frequently asked questions

For which products can the flow be measured?

The FlowSlide dynamic scale is suitable for all free-flowing, non-sticky products.

Therefore, a wide spectrum of different products such as plastic granules, cereals, polystyrene, wood pellets, dried parsley, catalysts, sand, to mention just a few, can be measured.

Product densities of 30 kg/m³ up to 4,000 kg/m³ can be measured with the FlowSlide.

For what applications is the FlowSlide used?

Balancing material flows, truck loading, process control, dosing, continuous precision mixing processes

How can I tell whether my product can be measured with FlowSlide?

Products with very good flow behaviour, such as plastic granules, many types of pellets or cereals are always suitable for FlowSlide.

If they have good free-flowing behaviour, powders can also be measured.

In the case of critical products, a test run with 3 – 5 litres of material will give the answer. Please do not hesitate to contact us for further information!

What measuring ranges can be covered?

The smallest device, the Baby-FlowSlide 05, can measure with precision from 100 l/h.

The largest device, the Maxi-FlowSlide 300 measures up to 300 m³/h.

You select your equipment based on the maximum volume flow. The flow stream is measured in kg/h or t/h and the quantity of the material in kg or t.

What do you have to know in order to select the correct system?

The important thing is that the product flows freely and does not stick together or to the sides of equipment.

The FlowSlide offers precision recording of products with a product density of from 0.03 to 4 kg/litre.

When designing the measuring point the type of feeding (rotary valve, screw or belt conveyor) must be taken into account. It is important that no strong air flows blow through the equipment.

Conversely, positive or negative pressure is not a problem. We will be pleased to send you mounting instructions in the preliminary stages.

What are the limitations of the system?

In the case of strongly adhesive materials or materials which are not free flowing and liquids in general, FlowSlide is not suitable as a flow meter.

Cases with volume streams lower than 100 l/h or with very low dosing amounts must be individually tested.

What is the life expectancy (lifetime) of a FlowSlide system?

There is no limit on life expectancy. The components which feed through the products are made from high-quality stainless steel.

With normal products (flue ash, cement, cereals, plastic granules, and many more) the measuring slide has a lifetime of more than 5 years.

In the case of abrasive products, such as rapeseed or cocoa beans, the components which are in contact with the product are manufactured in Hardox.

How many FlowSlides can be connected to one evaluation unit?

In order to reach the high level of accuracy of 0.5% measurements must be made 250 – 500 times/second. Therefore, only one system can be connected to the electronics.

The electronics system is part of the standard scope of delivery of the system.

What interfaces are possible and what data is transmitted?

All current interfaces, such as Profibus, Profinet, analogue outputs, impulse signals, Ethernet, serial RS232/485, etc. are available.

Depending on the interface, the flow (kg/h or t/h), transported quantity (kg or t), meter readings, reference values, state and status of the measurement system are transmitted.

For how long is the flow record displayed on the electronic monitor? What data and totals does the electronic system display?

The electronic system has three quantity counters. These store the absolute flow, until they are reset. The throughput graph (kg/h or t/h) displays for 30 minutes.

The graphic display visualises kg/h or t/h, absolute kg or t (3 counters), the load cell signal (mV/V) and the status of the dust removal system.

Errors are also shown in the display. Flow and absolute quantities can be saved in the long term on a USB key.

As a standard feature the electronics system offers as output 4–20 mA, an impulse output, Modbus TCP. As an option Profibus, Profinet and other interfaces are available.

What are the requirements for maintenance?

Since there are no movable components in the device, the FlowSlide is practically maintenance-free.

Only the parts in contact with the product need to be replaced as required in the case of highly abrasive media.

There is the option for abrasive products of manufacturing the parts in contact with the product in Hardox plate or of processing these parts with hard chromium plating.

In which industries is FlowSlide used?

The measuring principle is suitable for an extremely wide variety of products and therefore for nearly all sectors. To date the only industry which does not use FlowSlide is the pharmaceutical industry.

Can a FlowSlide be pre-calibrated ex works?

As a matter of principle every device is pre-calibrated ex works.

The devices are manufactured on 5-axis machines which allows them to be manufactured to a mechanical accuracy such that even a mathematical calibration on the size of the load cell is sufficient.

Nevertheless, it is recommended that they are calibrated after installation, since this compensates differences in the inlet geometry.

System accuracy of less than 1% can be obtained only by calibration on site.

How does it differ from an impact weigher?

FlowSlide uses the centripetal force to record the throughput. This is directly proportional to the flow stream. Therefore, when you measure with FlowSlide, the product density, grain size and friction have only a very slight influence on the accuracy of measurement.

An impact weigher uses a deflector plate to detect the impact pulse through the product. This is heavily dependent on the characteristics of the product.

Slight differences in density, humidity or elasticity, even in the same products, can falsify the measuring result to a considerable extent.

When the product characteristics change, the impact weigher inevitably has to be re-calibrated. Fluidized powders cannot be measured with an impact weigher to give sensible results.

What does a FlowSlide system cost?

The selection of the size of the equipment depends on the flow stream. Moreover, there are various options (Hardox models, pneumatic dust removal, etc.), which may be suitable for your application.

Therefore, we will be pleased to advise you personally and to send you a quotation tailored to your application.

What installation height must be available or prepared?

The installation heights are 400 mm for the Baby-FlowSlides, 700 mm for the FlowSlides and 1,050 mm for the Maxi-FlowSlides.

The individual installation height for a feed and discharge hopper as a transition point, to connect the upstream and downstream sections of the plant, must be additionally calculated.

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