A safety laser scanner monitors a configured detection field, while a gate interlock monitors a movable guard. Their functions are different and neither should be selected from a product label alone. Have a qualified designer complete the machine risk assessment, select the safeguarding method and validate the full system.
A safety scanner and a gate interlock serve different safeguarding roles. A scanner monitors a configured detection field; an interlock is associated with a movable guard. OSHA notes that robot risk reduction may use interlocked guards, light curtains or laser scanners, with the safeguards verified and documented as part of the application.
Device comparison chart
| Detail | Safety laser scanner | Gate interlock |
|---|---|---|
| Device role | Monitors a configured field or zone | Monitors a movable guard or access door |
| Layout questions | Detection field, blind areas, reach-around and stopping distance | Gate position, access sequence and guard construction |
| Integration | Safety controller and device configuration per manual | Guard hardware, interlock and safety control logic |
| Common review | Field configuration, response and restart behavior | Guard alignment, defeat resistance and release method |
| Validation | Test the full field and machine response | Test guard operation and machine response |
OSHA’s robotics safety technical manual discusses safeguarding in robot applications. Its machine guarding devices guide describes presence-sensing devices. Apply the manuals and standards relevant to the actual machine.
Review the application
- Document access routes, tasks, maintenance and foreseeable entry points.
- Have a qualified designer complete the machine risk assessment.
- Select a safeguarding method for the hazard and required access pattern.
- Confirm device ratings, mounting, detection or interlock function and controller compatibility.
- Review stopping behavior, reset and restart logic, and reach-around access.
- Validate and document the installed safety function before operation.
Compare light curtains and safety scanners, review safety relays and controllers, and browse safety components.
Sources
Common questions
Is a safety scanner the same as a gate interlock?
No. A scanner monitors a configured detection field; a gate interlock monitors a movable guard and its related safety function.
Can a scanner replace a physical guard?
Do not assume that. Safeguarding depends on the machine risk assessment, device application and system design.
Can a gate interlock stop every hazardous movement by itself?
The complete safety function includes the guard, interlock, control system and machine stopping behavior. Follow the design requirements.
Who should select these devices?
A qualified machinery safety designer or integrator should assess and validate the safeguarding system.