Weighing Screw Conveyor
The dust-tight weighing solution
We work with you to optimise the operation of your plant and the measurement of your bulk products
Immediate advice: +49 (0) 29 61 – 96 56 86
The added value to you
Why is the weighing screw conveyor the right choice for my plant?
With the benefit of our many years of experience we help you to select the right equipment for your system.
+49 (0) 29 61 – 96 56 86
You are probably familiar with the following situation:
You need continuous flow measurement and would like to use existing equipment
Your product can (only) be conveyed by screw conveyors and requires a closed system.
You do not have sufficient structural height to install other solid flow measure systems like impact meter or intakes scales.
The ideal solution:
Screw conveyors are closed, dust-tight systems, which transport even difficult products reliably.
A weighing screw conveyor measures the actual material flow and the absolute during the material is conveyed.
A weighing screw conveyor can be retrofitted for many existing types of screws. Alternative we can supply the complete system consisting of screw conveyor and weighing equipment.
Upon request, we will gladly send you a series of information about our products, starting with the access to our data sheets.
How does the weighing screw conveyor work?
The screw is supported on the drive side in a maintenance-free flexure. The material is fed in symmetrically to this swivel joint; therefore, the impulse forces generated by the material feeding have only a very slight effect on the weigher. On the output side a precision tension load cell ensures that the load is weighed exactly.
The electronic unit standardises the load cell weight signal and links it to the rotation speed, which is measured by a maintenance-free, incremental rotary encoder. The product of rotation speed and net weight thus corresponds to the flow rate in kg or t per hour.
It is important that the screw conveyor is completely uncoupled from the input and the output side. For this reason the weighing screw conveyor must be feed via a rotary valve or a second screw.
To prevent that the product is „thrown over“, the screw should be filled to a defined degree only. Furthermore, the screw volume (length and cross-section of the screw) must remain in sensible relationship with the tare-weight. A longer screw is frequently required for low product densities and low flow rates.
On request, we supply the complete weighing screw or alternatively only the weighing technology components to retrofit existing screws.
0 – 40 mm
Product density range:
200 – 4000 kg/m³
C3 / Stainless Steel
5 – 15 VDC
Sensor protection class:
typically 2 – 4%
Colour graphic display, kg/h or t/h,
kg absolute or t absolute
110 – 240 VAC / 12 – 30 VDC
Full Bridge Strain Gauge Sensors / inputs for tare and start batch, etc.
Counting pulses (kg/t)
4-20 mA / RS232/485 / Profibus DP /
Profinet / Modbus / Batching contact / etc.
Type of protection:
Type of mounting:
Wall- or Panel mounting
Working temperature Range:
-10°C to +40°C
Frequently asked questions
What levels of accuracy can be obtained with weighing screw conveyors?
How can the accuracy of a weighing screw conveyor be improved?
The filling degree of the screw must not exceed 40%, depending on the product and the screw rotation speed. For automatic calibration, in many applications we place a weighing container in front of the screw intake to regularly check and correct the tare load of the screw conveyor.
What measuring ranges can be covered?
Depending on the product and the screw length, mass throughputs of 10 t/h up to 500 t/h can be recorded.