Safety Light Curtain Minimum Distance

At Right Angles to Approach

Interactive Tool acc. to ISO 13855

S = v∙T + c

Stopping performance T ms
Detection capability d mm
Non-industrial use
Approach speed v x m/s
Intrusion distance c x mm
Minimum distance S x mm
Parameters explained

Above graphic shows general concept only. Minimum distance shown is hard to implement: Finger protection (d = ∅14 mm), very fast reaction time, and almost instantaneous stopping are all required. Larger distances impede ergonomy. Contact Engineering Consultant Wolfgang Grassberger for expert help on these topics:

  • Estimating overall stopping performance
  • Heigth of upper edge (reaching over)
  • Height of lower edge (crawling under)
  • Stepping through
  • Required Performance Level PLr
  • Proving PL in SISTEMA
  • Requirements for muting acc. DIN EN IEC 61496-1
  • Light curtains with starting function acc. DIN EN ISO 12100
  • Validation acc. DIN EN ISO 13849-2
  • Regular Testing

Relevant Parameters

Back to tool
Stopping Performance T
Timespan from actuation of a safeguard until dangerous movement has stopped completely. Overall System Stopping Performance in ISO 13855.
Detection Capability d
Smallest item that actuates safeguard. Sensor Detection Capability in ISO 13855.
Approach Speed v
Speed taken into account when reaching through a safeguard. Approach Speed Parameter K in ISO 13855.
Intrusion Distance c
Distance up to which a safeguard is not yet activated by reaching through.
Height h
Height of hazard above floor level. Height a of Hazard Zone in ISO 13855.
Height H
Height of upper edge of a safeguard above floor level, to prevent reaching over. Height b of the safeguard in ISO 13855.
Minimum Distance S
Distance between a safeguard and the hazard. Required to stop machine movement in time before hazard can be reached.

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