High-Precision In-line Measuring Light Curtain QL Series — The Perfect Partner for In-Motion Checkweighers
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 QL Series
The Measuring light curtain creates a dense grid of infrared beams. When a package passes through, the system detects interruptions in the beams to accurately reconstruct its length, width, and height. By using a crossed-beam array, it can capture 3D dimension data in real time, even for irregularly shaped parcels.
● 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
The Perfect Integration Of Measuring Light Curtains And In Motion Checkweighers
The in-motion checkweigher integrates a high-speed conveyor with precision weighing cells. As packages move across the scale without stopping, the system captures accurate weight data instantly. Combined with dimension data, it provides a complete weight–volume profile for each package.
● Dynamic accuracy: ±0.5 g (range 10 kg) / ±5 g (range 30 kg)
● 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
1️⃣ Package enters high-speed conveyor
2️⃣ Photoelectric sensor triggers
3️⃣ Light curtain scans length, width, height
4️⃣ Checkweigher measures weight instantly
5️⃣ PLC sorts packages to the corresponding chutes/storage areas based on weight + volume
2️⃣ Photoelectric sensor triggers
3️⃣ Light curtain scans length, width, height
4️⃣ Checkweigher measures weight instantly
5️⃣ 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.
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
Featured Products
Beam spacing: 2.5mm
Number of optical axes: 32
Protection height: 77.5mm
Detection distance: 30-150mm, 2M, 10M
Power supply voltage: DC12-24V
No-load current：9mA , 9mA, Reflection 11mA, reception 9mA
Connection method：Wire lead type (standard wire length 2m)
Output method: NPN/PNP+analog+RS485
Resolution: 1mm
Laser type: red semiconductor laser Class II laser 655+10nm<1m
Reaction time: 50-200ms
Beam spacing：10mm
Number of optical axes: 74
Protection height: 730mm
Safety Curtain outputs (OSSD):2 PNP
Further Reading
In-Motion Checkweigher for Lightweight Packages
● Brand: SameGram
● Model: SCF-4523L3
● Weighting range: 1-3000g
● Belt speed: 5-90m/min
● Weighting accuracy: ±0.3-2g
● Weighting section size: L 450mm*W 230mm
● Applicable product size: L≤300mm; W≤220mm
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