Geometry
A light curtain creates a straight protective field between transmitter and receiver. A scanner sweeps an area and can form irregular protective and warning fields.
Access pattern
Light curtains suit repeated loading through a fixed opening. Scanners suit open cells, approach zones, internal presence detection and mobile applications.
Detection and bypass
Light-curtain resolution is selected for finger, hand or body detection. Scanner performance depends on object detection, field configuration and mounting height. Reach-around and stepping-over must be prevented.
Environment
Dust, steam, sunlight, reflective surfaces, vibration and impact can affect optical devices. Protective columns, housings and cleaning routines may be needed.
Material transfer
Light curtains can use muting for defined product flow. Scanners can switch fields or use contour monitoring. The logic must prevent people following material into the hazard.
Stopping and reset
Both require a safety distance based on total stopping performance. Reset must be deliberate and positioned so the protected area can be checked.
Project checklist
Points to confirm
- Opening or area geometry defined
- Approach direction known
- Stopping time measured
- Detection capability selected
- Bypass routes prevented
- Environment assessed
- Material-flow logic defined
- Reset visibility confirmed
How Oxford Machine Guarding can help
We can survey the equipment, define the guarding and safety-system scope, develop the design, supply and install the solution, and provide testing and handover records appropriate to the agreed project boundary.
This guide provides general technical information. It is not a substitute for a machine-specific risk assessment, legal advice or verification by the responsible dutyholder.
