A belt weigher, also called a weightometer or conveyor belt scale, needs more than correctly installed electronics. Conveyor location, belt tension, idler alignment, material flow, supporting structure, and commissioning all influence the result.
- Choose a straight, stable section of conveyor where the material has settled before weighing.
- Keep the weighing area away from loading points, curves, pulleys, trippers, and ploughs unless the equipment design allows the arrangement.
- Align the weigh idlers and the adjacent approach and retreat idlers correctly.
- Provide rigid support, protection from avoidable vibration, and safe access for cleaning and calibration.
- Confirm the final position through a site assessment and the applicable installation requirements.
What makes a good weighing location?
A belt weigher generally needs a straight, stable section of conveyor where the belt runs consistently and the material is distributed evenly. The best location depends on the conveyor layout, belt speed, material characteristics, idler configuration, scale design, and operating conditions.
As a starting point, assess whether the proposed location is:
- on a straight section rather than in or immediately beside a convex or concave curve;
- far enough from the loading point for the material to settle and spread consistently;
- away from head and tail pulleys where the belt changes direction;
- positioned so the measured material is not added to or removed from the belt by a tripper or plough before the weighing point; and
- supported by a structure that remains stable under operating load.
There is no single distance that suits every conveyor. A site assessment should determine the final position.
Why does the loading point matter?
Material near a loading point may still be spreading, accelerating to belt speed, rolling, or moving unevenly across the belt. If the weighing area is too close to this disturbance, the signal may be less stable and the measured load may not represent a consistent belt profile.
Skirt seals, spillage, and material build-up can also affect the belt and the surrounding structure. Keep the weighing area far enough from the loading zone for the belt to run cleanly and for the material to settle. The required distance depends on the conveyor and application.
How can belt tension affect belt scale accuracy?
Belt scales infer material loading from the force applied through the belt and weigh idlers. Changes in belt tension, belt stiffness, take-up movement, temperature, conveyor incline, and loading conditions can influence the measurement.
For that reason, assess the take-up arrangement and the tension conditions along the conveyor rather than applying a universal rule about where the scale should be placed. Accurate Industries can assess whether the proposed location provides sufficiently consistent belt behaviour.
Why does weigh idler alignment matter?
Correct alignment of the weigh idlers and the adjacent approach and retreat idlers is a critical installation factor. Differences in height, angle, or position can change how the belt passes through the weighing area and introduce error or instability.
The idlers in the weigh area should also be suitable for the application and kept in good condition. Damaged rollers, bent shafts, build-up, or excessive drag can affect the belt’s movement and the weighing signal.
What support and access does the scale need?
The weighing equipment should be mounted on a stable structure that does not move excessively under operating load or nearby vibration. Portable and skid-mounted conveyors need particular care because relocation can change the plant’s level, support conditions, alignment, and belt tension.
After relocation, inspect the installation and complete the relevant recommissioning and calibration procedure before relying on the measured tonnage.
Provide safe access around the weighing area for inspection, cleaning, testing, and calibration. Spillage and carryback can affect the belt, idlers, frame, or load-sensing components, so housekeeping is part of maintaining reliable performance.
How does the surrounding environment affect the installation?
Consider environmental and operating conditions during the site assessment, including:
- vibration transferred from crushers, screens, transfer points, or other equipment;
- wind exposure on elevated or uncovered conveyors;
- temperature and direct solar heating where it may affect the structure or electronics;
- water, dust, spillage, and carryback; and
- safe access for inspection and maintenance.
The significance of each factor depends on the equipment and site. Accurate Industries can recommend practical measures to improve the installation environment.
What happens during a belt weigher installation?
Accurate Industries can assess the conveyor before installation and identify practical constraints before the equipment is mounted. Depending on the project, the work may include:
- Inspecting the conveyor and proposed weighing locations.
- Checking the structure, belt path, idler arrangement, loading conditions, take-up, access, and surrounding equipment.
- Installing or modifying the weighing equipment.
- Checking the weigh idlers and adjacent idler alignment.
- Inspecting the belt and weighing area for build-up, damage, or interference.
- Completing commissioning and calibration.
- Recording the results and identifying any follow-up maintenance or site work.
Calibration and verification requirements depend on the equipment, application, and customer requirements. Accurate Industries can explain the process before work begins.
Following the visit, service and calibration reports can be retained against the relevant asset in AIMM, the Accurate Industries Maintenance Manager. This creates a practical history of what was checked, what was found, and what may be due next, rather than leaving important information across separate emails or folders.
Frequently asked questions
Can a belt weigher be fitted to any conveyor?
Not every location is suitable. Accurate Industries can assess the conveyor, identify constraints, and explain the likely accuracy and maintenance implications of the available options.
Why is a new belt weigher reading poorly?
Check the installation conditions before assuming the instrument is faulty. Possible contributors include location, belt tracking, idler alignment, structure movement, material flow, build-up, belt tension, wiring, speed measurement, and calibration. A site inspection can help identify the cause.
How much straight belt does a belt weigher need?
There is no universal distance. The required arrangement depends on belt width, speed, material, conveyor geometry, idler design, loading conditions, and the scale system. A site assessment is the reliable way to determine whether a proposed position is suitable.
Does moving a portable conveyor affect the belt weigher?
It can. Relocation may change the plant’s level, support conditions, idler alignment, belt tension, and calibration conditions. Inspect, recommission, and recalibrate the system before relying on the new readings.
Can a location problem be fixed without moving the scale?
Sometimes. Alignment, support, housekeeping, belt tracking, access, and other installation conditions may be improved without relocating the equipment. If the scale is in a fundamentally unsuitable position, relocation may be the more reliable option. Accurate Industries can assess the installation and explain the available choices.