A pallet scanning system is a fixed or semi-fixed dimensioning device that measures the length, width, height, and weight of palletized freight. Unlike parcel dimensioners designed for small packages on conveyors, pallet scanners are built to handle the full range of freight encountered at warehouse docks and LTL terminals: standard 48x48 pallets, EUR-pallets, double-stacked freight, and irregular oversized loads that extend beyond standard pallet footprints.
Modern pallet scanning systems complete a full measurement in under two seconds and push the data directly to WMS, TMS, or ERP systems via API. The result is a verified, timestamped measurement record that can be used for freight class calculation, carrier billing, storage slot assignment, and dispute resolution.
Three primary sensing technologies are deployed in commercial pallet scanning systems:
LiDAR-based pallet scanners emit laser pulses and measure the time it takes for each pulse to reflect off the freight surface. By sweeping thousands of measurement points across the pallet in milliseconds, the system constructs a complete three-dimensional point cloud of the freight. Dimensions are extracted from the point cloud with accuracy typically in the +/-2-3mm range.
LiDAR is particularly effective for irregular freight, overhang detection, and freight with reflective or transparent surfaces that challenge camera-based systems.
Structured light systems project a known pattern (grid, stripes, or dots) onto the freight surface and use cameras to analyze how the pattern deforms. Deformation corresponds to surface contour, which is converted into three-dimensional coordinates. Structured light systems achieve accuracy in the +/-3-5mm range for typical pallet freight.
Most static pallet dimensioners deployed at LTL carrier docks use structured light technology. They are well-proven, cost-effective, and perform reliably in controlled indoor lighting conditions.
Stereoscopic systems use two or more cameras separated by a fixed baseline to triangulate the three-dimensional position of points on the freight surface. They are lower cost than LiDAR systems and work well for uniform, regular freight shapes. Performance degrades on irregular surfaces, very dark freight, or reflective packaging.
Oversized freight presents specific measurement challenges that standard parcel dimensioners cannot address:
Pallet scanning systems are deployed in two primary configurations:
Fixed portal (drive-through) systems are installed as a permanent arch or gate structure at a dock door or in a dedicated measurement lane. Forklifts or pallet jacks drive freight through the portal, and sensors mounted on the overhead arch scan the freight as it passes. This configuration supports high throughput (100-300 pallets per hour) and requires no operator interaction for the measurement itself.
Kiosk-style (stationary) dimensioners position the freight in front of a fixed measurement station. The operator positions the pallet, initiates the scan via button or barcode read, and the system captures dimensions from multiple fixed sensors. This configuration is better suited for lower-throughput operations or locations where portal installation is not feasible.
The operational value of a pallet scanning system scales with how deeply it integrates into the facility workflow. A fully integrated pallet scanner:
For operations running SAP EWM, Manhattan Associates WMS, or Blue Yonder, certified integrations are typically available from established dimensioning system vendors. Custom integrations via REST API or flat-file exchange are also common for proprietary WMS environments.
While freight class calculation is the most commonly cited use case for pallet scanning, the same measurement data is used across multiple operational functions:
Standard pallet scanning systems handle freight up to 48 x 48 x 96 inches (1.2 x 1.2 x 2.4 meters). Extended portal configurations accommodate freight up to 2.5m wide and 3.5m tall for specialty applications such as air cargo ULD dimensioning and oversized industrial freight.
Commercial pallet scanning systems certified for freight billing typically achieve +/-2-5mm linear accuracy on each dimension. For a standard pallet load, this represents a volume error of well under 1%, which is within NMFC and carrier billing tolerances.
Most commercial pallet scanners are designed for indoor use with controlled ambient lighting. Some LiDAR-based portal systems can operate in covered outdoor areas such as loading canopies, but are not typically rated for direct rain or uncontrolled sunlight exposure.
A kiosk-style pallet dimensioner can typically be installed and commissioned in 1-2 days. A fixed portal system requires structural mounting and typically takes 3-5 days for installation, plus integration testing time with the WMS or TMS.