Choose the tunnel by the largest item you must inspect, not by the average bag. The tunnel is quoted as width × height in millimetres, and the model number encodes it: 5030 means 50 × 30 cm, 10080 means 100 × 80 cm. If a bag does not fit, the operator has to open it by hand — which is exactly the labour the scanner was bought to remove.
The first two digits are the width in centimetres, the next two the height. So 5030 = 50 × 30 cm, 6040 = 60 × 40 cm, 8065 = 80 × 65 cm, 10080 = 100 × 80 cm, 100100 = 100 × 100 cm, 150180 = 150 × 180 cm. The actual aperture is usually a few millimetres larger than the nominal figure because of the frame design.
Every oversized bag becomes a manual inspection. At a busy entrance that means queues, and staff start waving bags through to keep the line moving — which defeats the purpose. Replacing a scanner later costs the full machine price; the tunnel cannot be enlarged.
Allow at least 1.5 m of clear space before and after the conveyor for queuing and re-check, plus a table beside the exit for secondary inspection. If the entrance is narrow, a 5030 with a longer roller table usually beats a 6550 squeezed into a corridor.
Can I put a suitcase diagonally through a smaller tunnel? Occasionally, but it slows the line and risks jamming. Size for the normal case, not the exception.
Do I need dual view with a large tunnel? It helps. Large items overlap more, so a second view reduces missed detections.
What is the conveyor load limit? It varies by model: 150 kg on the 5030 and 6040, 250 kg from 8065 to 100100, and 2000 kg on the 150180.
5030A · 5030C · 6040C · 8065C · 10080C · 10080D · 100100C · 150180C
