InterProcess Sp. z o.o. | Solutions for industry
What a belt conveyor scale is
Flow measurement without interrupting the conveyor
Belt conveyor scales, also known as belt weighers or conveyor belt scales, continuously measure the stream of bulk material travelling along a conveyor. They let you control raw material consumption, supervise blend ratios, monitor loading and discharge and control the production process.
The InterProcess range comprises three models designed for different load ranges and accuracy requirements. We manufacture proven designs ready for installation on our customers’ conveyors, and for non-standard layouts we supply units engineered specifically around the existing installation conditions.
Compact and affordable
WPL belt conveyor 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 remains very rigid even under heavy loads, and the shielded load cells are protected against mechanical damage. As with the other models, the whole scale is levelled with adjusting screws.
Key WPL specifications
- Accuracy
- ±1–2%
- Belt width
- up to 1200 mm
- Maximum flow rate
- up to 4000 t/h
- Load cells
- 1 or 2 aluminium strain-gauge load cells, IP67 — depending on belt width
- Adjustment
- whole scale levelled with adjusting screws
Downloads
The all-round model
WPC1 belt conveyor scale
The WPC1 is the belt weigher we most often recommend to our customers. Its design, based on a parallelogram frame of flat springs with no levers or pivots, was developed in response to the dynamic demands placed on weighing systems operating under very high loads.
A single stainless steel load cell rated IP68/IP69K minimises the risk of failure, while the telescopic arms ensure the scale fits the spacing of the conveyor structure. The whole scale is levelled with adjusting screws, which simplifies installation and later realignment.
Key WPC1 specifications
- Accuracy
- measuring error below ±0.5%
- Belt width
- from 500 to 2000 mm
- Maximum flow rate
- up to 12,000 t/h
- Load cell
- stainless steel strain-gauge cell, IP68
- Construction
- parallelogram frame of flat springs, no pivots
- Adjustment
- whole scale levelled with adjusting screws
Downloads
Highest accuracy
WPC2 belt conveyor 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 (parallelogram frame, IP68 load cell, no 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 12,000 t/h
- Load cells
- stainless steel strain-gauge cells, IP68
- Adjustment
- whole scale levelled with adjusting screws
Downloads
Model comparison
Which scale model to choose?
The choice depends on the accuracy required, the belt width and the installation conditions. The WPL suits applications where simplicity and restricted space count, the WPC1 answers most applications, and the WPC2 is chosen wherever the material balance has to be as precise as possible.
| 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 | 12,000 t/h | 12,000 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 |
| Levelling | Whole scale, adjusting screws | Whole scale, adjusting screws | Whole scale, adjusting screws |
| 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 conveyor scales in customers’ installations
WPC and WPL scales operating in aggregate quarries, waste processing plants and sanitaryware production. Click a photo to enlarge.
Operating principle
Belt load × belt speed
A typical belt conveyor 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 rate (kg/s, t/h) and the totaliser increment (kg, t). Modern integrators communicate with higher-level systems (PLC, SCADA) over Modbus, Profibus, Profinet or EtherNet/IP, making the belt weigher an integral part of the plant’s process automation.
Electronics and integration
Integrator, HMI and communication with plant automation
Every InterProcess belt weigher works with our own measuring electronics, which do considerably more than weigh the passing material. Depending on 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, by the static method (test weights) and 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 is conveyed 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.
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.