InterProcess Sp. z o.o. | Rozwiązania dla przemysłu
What a belt scale is
Flow measurement without interrupting the conveyor
Belt scales, also known as belt weighers or conveyor scales, measure the stream of bulk material travelling along a conveyor continuously. They let you control raw material consumption, supervise blend ratios, monitor loading and discharge, and control the process itself.
The InterProcess range comprises three models designed for different load ranges and accuracy requirements. We manufacture proven designs ready to install on our customers' conveyors, and for awkward layouts we supply units engineered specifically around the existing installation conditions.
The all-round model
WPC1 belt scale
The WPC1 is the belt weigher we most often recommend to our customers. Its design, built around a parallelogram frame of flat springs with no levers or pivots, was developed in response to the dynamic demands placed on weighing systems working under very high loads.
Using a single stainless steel load cell rated IP68/IP69K minimises the risk of failure, while the telescopic arms guarantee a precise fit to the customer's conveyor.
Key WPC1 specifications
- Accuracy
- measuring error below ±0.5%
- Belt width
- from 500 to 2000 mm
- Maximum flow rate
- up to 12000 t/h
- Load cell
- stainless steel strain-gauge cell, IP68
- Construction
- parallelogram frame of flat springs, no pivots
- Adjustment
- idler height adjustment available
Downloads
Highest accuracy
WPC2 belt scale
The WPC2 consists of two or more WPC1 scales installed in series on a single conveyor. Extending the weighing zone allows the belt load to be averaged more accurately, which translates into even higher measuring precision.
Every advantage of the WPC1 design — the parallelogram frame, the IP68 load cell, the absence of pivots — applies here too. This is the solution chosen wherever the most accurate material balance matters.
Key WPC2 specifications
- Accuracy
- measuring error below ±0.25%
- Configuration
- two or more WPC1 frames in series
- Belt width
- from 500 to 2000 mm
- Maximum flow rate
- up to 12000 t/h
- Load cells
- stainless steel strain-gauge cells, IP68
Downloads
Compact and affordable
WPL belt scale
The WPL is the smallest and most affordable belt weigher in our range. Its compact dimensions suit installations where space is restricted: mobile crushers or short conveyors.
Despite its compact size the structure stays very rigid even under heavy loads, and the shielded load cells are protected against mechanical damage.
Key WPL specifications
- Accuracy
- ±1–2%
- Belt width
- up to 1200 mm
- Maximum flow rate
- up to 4000 t/h
- Load cells
- two aluminium strain-gauge cells, IP67
- Adjustment
- scale height adjustment available
Downloads
Model comparison
Which model should you choose?
The choice depends on the accuracy required, the belt width and the installation conditions. The WPC1 answers most applications, the WPC2 is chosen wherever the material balance has to be as precise as possible, and the WPL wherever simplicity and restricted space are what count.
| Parameter | WPC1 | WPC2 most accurate | WPL |
|---|---|---|---|
| Accuracy | <±0.5% | <±0.25% | ±1–2% |
| Belt width | 500–2000 mm | 500–2000 mm | up to 1200 mm |
| Max. flow rate | 12000 t/h | 12000 t/h | 4000 t/h |
| Load cells | 1 × stainless steel, IP68 | 2 × stainless steel, IP68 | 2 × aluminium, IP67 |
| Frame construction | Parallelogram (flat springs) | Multi-point (WPC1 units in series) | Compact, rigid |
| Height adjustment | Idlers | Idlers | Scale |
| Typical application | All-round, most applications | Highest precision, accurate material balance | Restricted space, mobile crushers |
Need not just measurement but active flow control as well? Take a look at our DTU and DTC belt weighfeeders, which combine weighing with closed-loop control of the belt speed.
Case studies
Belt scales in customers' installations
A selection of our scales installed on customers' conveyors. — click to enlarge
Operating principle
Belt load × belt speed
A typical belt scale comprises a weighbridge (the weighing frame) supported on load cells, an integrator and a belt speed sensor. The load cells measure the belt load within the weighing zone, generating a signal proportional to the mass of material, while the speed sensor — mounted on the return belt as close to the scale as possible, to keep cable runs short — supplies the current belt speed as a pulse train.
From these two signals the integrator calculates the mass flow (kg/s, t/h) and the increment of the totaliser (kg, t). Modern integrators communicate with higher-level systems (PLC, SCADA) over Modbus, Profibus, Profinet or EtherNet/IP, which makes the belt weigher an integral part of the plant's process automation.
Electronics and integration
Integrator, HMI and communication with the plant automation
Every InterProcess belt weigher works with our own measuring electronics, which do considerably more than weigh the passing material. Depending on the demands of the application, we equip the system with flow control, batch dosing, PLC and SCADA communication and production data logging.
For every scale we can issue a calibration certificate stating the calculated measurement uncertainty. Our engineering team handles installation, commissioning and on-site calibration, both by the static method (test weights) and by the material method (comparison against a reference scale).
Protocols
Modbus RTU/TCP, Profibus DP, Profinet, EtherNet/IP, 4–20 mA analogue outputs and pulse outputs.
HMI panel
Monitoring of flow rate and totaliser, parameter changes, and a view of measurement history and alarms.
Calibration and service
Calibration certificate, zero and span calibration, on-site commissioning, 24/7 service.
Industries and applications
Wherever material travels on a belt
Continuous mass flow measurement makes it possible to optimise processes, cut material losses and keep a reliable production balance, whatever the industry.
Mining and extraction
Flow control for ore, coal and aggregates, output balancing, and measurement at crushers and transfer points.
Cement and lime
Monitoring of raw material and finished product, supervision of raw mix proportions, and mill control.
Power generation
Measurement of coal and biomass on the way to the boiler, fuel consumption control, and unit energy balance.
Recycling
Weighing waste on sorting lines, reporting of fraction streams, and monitoring line throughput.
Food and chemical
Raw material balancing, consumption control, recipe supervision and traceability of production batches.
A non-standard application
For non-standard conveyors we design the scale individually around the installation conditions.
Tell us about your conveyor →FAQ
Frequently asked questions
Why InterProcess
Why choose our solutions?
In-house manufacturing
Belt weighers are designed and built at our own works.
A tailored approach
We match the scale to the customer's existing conveyor.
End-to-end delivery
From design through to installation, calibration and service.
Calibration certificate
For every scale, stating the calculated measurement uncertainty.
Experience across many industries
Mining, cement, power generation, recycling and food.
Technical support and service
With a fast response, including 24/7 cover.