Measuring Light Curtain & In-Motion Checkweigher for Accurate Weight & Dimension Measurement in E-Commerce Logistics
Industry Background
With volumetric pricing now widely adopted, real-time collection of both weight and dimensions has become a must for courier companies and e-commerce warehouses.
Billing: Charges are based on the greater of volumetric or actual weight. The more accurate the data, the clearer the profit.
Loading: Truck and container space utilization can increase by 8%–15%.
Sorting: Items are routed by size/weight, reducing manual rechecks and boosting efficiency by over 30%.
Technology Overview
Measuring Light Curtain
Typical Model: DADISICK QL Series
Detection width: as small as 5 mm, edge resolution 2.5 mm
High gain → reliably detects semi-transparent, black, reflective, and other challenging packages
Uses a crossed light beam array, outputs 3D data of length, width, and height in real time
In-Motion Checkweigher
Dynamic accuracy: ±0.5 g (range 10 kg) / ±5 g (range 30 kg)
Real-time weight and dimension data can be directly integrated with WMS/WCS via TCP/IP, Modbus TCP, Profinet, etc.
One-button self-check, calibration, and taring; maintenance time < 2 min
Integrated Workflow
1.Package enters high-speed conveyor
2.Photoelectric sensor triggers
3.Light curtain scans length, width, height
4.Checkweigher measures weight instantly
5.PLC sorts packages to the corresponding chutes/storage areas based on weight + volume
Full cycle < 500 ms, no stop required, handling up to 3,600 items/hour.
Full cycle < 500 ms, no stop required, handling up to 3,600 items/hour.
Key Benefits
Transparent Costs: Avoids shipping disputes caused by “overstated” volume, improving customer satisfaction
Higher Loading Efficiency: Average truck/container space waste reduced by 12%, lowering per-trip transport costs
Reduced Labor: Verification roles for 3–5 people can be cut to just 1 inspector
Data Closed-Loop: Weight, dimensions, barcode, and photo linked; abnormal item traceability < 1 min
Typical Applications
E-Commerce Peak Sorting Lines: 24/7 3PL warehouse operations, peak 50,000 packages/day
Cross-Border Consolidation Centers: Accurate volumetric billing avoids secondary shipping charges
Reverse Logistics & Returns: Automatically identifies “abnormal packaging” for early interception
