An unattended weighing system automates the truck-weighing process from vehicle identification to weight recording and exit control, with no operator required at the weighbridge for each transaction. The truck enters the scale, its identity and weighing instruction are checked, and the system records a stable weight from the weighbridge indicator. Depending on the transaction, the truck then leaves or returns for a second weighing; the system matches the readings and stores the completed record for authorized staff to review.
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At Wanji, we approach this as an integrated electronic data system, not simply a scale. A dependable design must coordinate the weighbridge, identification devices, traffic controls, software, and the site’s operating rules. The sections below explain the process and the practical decisions buyers should make before specifying equipment.
An unattended system connects the truck scale to equipment that identifies vehicles, guides drivers, captures weight data, and controls access. A typical configuration may include a weighing indicator, vehicle identification reader, traffic lights, a barrier, a driver-facing terminal, and management software. Cameras or other sensors may also be included when the site needs additional identification or process checks.
The exact equipment depends on the site and its procedures. For example, a facility may identify vehicles using RFID cards, a ticket or code, license-plate recognition, or a combination. The system should only allow a transaction to proceed when the selected identification method and operational rules are satisfied.
When a truck approaches the weighbridge, traffic lights and signs direct the driver to stop or proceed. An identification device can read a credential, while a terminal may ask the driver to enter or confirm transaction details. The system checks that the vehicle or job is recognized before allowing the weighing sequence to continue.
Site rules determine what happens when an ID is missing, duplicated, or not authorized. A well-planned system provides a clear exception path, such as directing the driver to contact staff rather than leaving the vehicle waiting without instructions. This is especially important where several vehicle types or loading points use the same scale.
The truck must be correctly positioned for the weighing method and weighbridge design. In a static weighing process, the vehicle stops on the platform, and the system waits for a stable reading before accepting the weight. Traffic lights, barriers, driver instructions, and suitable platform layout help reduce the risk of a partial or incorrectly positioned vehicle.
Buyers should confirm whether their process requires the entire vehicle to be on the platform at once or uses another approved weighing arrangement. A standard static weighbridge process is different from weighing in motion, where vehicles are measured while moving under a system designed for that purpose. The required method should be established before selecting equipment.
The weighbridge load cells provide a signal to the weighing indicator, which calculates and displays the measured weight. The unattended system receives the weight value and can apply configured checks, such as confirming that the reading is stable and that the expected vehicle identification is present. If a check fails, the system should flag the transaction for review rather than silently treating it as complete.
For a loaded truck’s first visit, the system may record a gross weight; for an empty truck’s first visit, it may record a tare weight. The sequence varies by operation. The software needs to associate each reading with the right vehicle and transaction so that a later second weighing can be matched correctly.
Some operations require only one weighing, while others calculate net weight by matching two readings from the same vehicle or load. In a two-weighing workflow, the system stores the first reading and retrieves it when the truck returns for the second. It can then calculate the difference according to the configured business rules and record the transaction details.
After the required checks are passed, the system can issue a ticket or display instructions, then operate a barrier or traffic light to guide the truck off the platform. The completed record may include the vehicle ID, date and time, weight values, and relevant transaction fields. Access to records and any connection to other business software should be defined with the site’s data and security requirements in mind.
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Before specifying hardware, map the real journey: where trucks enter, how they are identified, whether they weigh once or twice, and how exceptions are handled. Decide who can authorize a manual correction and how staff will support a driver who cannot use the terminal. Clear workflows help prevent equipment from being purchased without the functions the operation actually needs.
Match the weighbridge to the vehicle types, expected loads, available space, and applicable local requirements. As illustrative planning inputs—not Wanji product specifications—a project brief might consider a 60 t capacity, an 18 m deck, and a 24 V DC supply for a particular peripheral. These figures must be verified against the site’s vehicle dimensions, engineering design, selected equipment, and local rules; they are not universal recommendations.
Choose identification methods based on operating conditions. RFID can support repeat vehicles with assigned credentials, while a terminal can support drivers who need to enter or confirm information. Cameras may provide additional visual records, but buyers should define what they must capture and how images will be managed rather than assuming a camera alone proves a valid weighing.
Confirm how the indicator communicates with the control software and whether the required data must be transferred to a management system, ERP, or dispatch platform. Specify the fields to be stored, how exceptions are logged, who can edit records, and how data is backed up. Interfaces and functions should be confirmed for the actual equipment combination instead of presumed from a component’s presence.
Weighing requirements vary by country and application. If weights are used for trade, billing, or regulatory reporting, buyers should verify the applicable legal metrology rules and required approvals with the relevant authorities and project stakeholders. An unattended workflow does not, by itself, establish that a scale or transaction complies with local requirements.
A system cannot resolve inconsistent operating rules on its own. If staff use different vehicle IDs, transaction steps, or exception procedures, automated records may be incomplete or difficult to reconcile. Documenting the workflow and assigning responsibility for exceptions before installation gives the system a clearer operating basis.
Unclear signs, poorly placed terminals, or confusing traffic signals can lead to incorrect stopping and unnecessary intervention. Review the approach and exit routes, driver sightlines, and safe stopping positions during site planning. Test the proposed instructions with the people who will use them, including drivers who may be unfamiliar with the facility.
Readers, barriers, networks, and weighing equipment all require suitable maintenance and operational support. Ask the supplier how faults are indicated, what staff can check safely, and how the site should handle a network or peripheral outage. Agree on a documented manual or fallback procedure that preserves traceability and follows site policy.
Keep identification rules consistent and minimize the amount of information drivers must enter at the scale. Use clear prompts, visible traffic signals, and a defined response for rejected IDs or unstable readings. These practical choices can make the automated sequence easier to follow without assuming a particular throughput or time saving.
Review transaction exceptions after commissioning, such as unmatched second weighings, manual overrides, and repeated identification failures. Use those records to adjust prompts, staff procedures, or device placement where appropriate. Also confirm that users know how to check a transaction and whom to contact when a system alert appears.
An unattended weighing system works by identifying the truck, guiding it onto the weighbridge, capturing and validating its weight, matching readings when a second weighing is required, and recording the completed transaction. Its suitability depends on more than the scale: identification, traffic control, software integration, site layout, exception handling, and applicable compliance requirements all matter.
To evaluate a project, document your vehicle types and weighing sequence, confirm the weighbridge and site requirements, list the data and interfaces you need, and define how staff will handle exceptions. Wanji can discuss an unattended weighing configuration around those operating requirements as an Electronic Data Systems supplier. Share your vehicle and workflow details with our team to begin a practical system review.
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