EN
10
Instructions for Use and Safety Precautions
The following standards must be observed during use of the light curtain:
EN ISO 13855
Machine safety: arrangement of safety devices in consideration of approach
speeds of body parts
EN ISO 12100
Machine safety: General design guidelines – risk assessment and risk minimization
EN ISO 13857
Machine safety: Safety distances to prevent hazard zones being reached by
upper and lower limbs
EN 349
Machine safety: Minimum gaps to avoid crushing of parts of the human body
EN ISO 13850
Machine safety: emergency stop devices
EN ISO 14119
Machine safety: Interlocking devices associated with guards
All specified data make reference to the following revision level: 22.05.2019
Technical changes to the product described herein, printing errors and/or any possible incompleteness of this
product description may not be construed as cause for asserting any legal claims whatsoever against wenglor
sensoric GmbH.
3.2 Securing the Danger Zone
The danger zone must be secured by means of the light curtain alone, or by means of the light curtain in combi-
nation with additional mechanical safety devices. Walking around the safety field at the side, as well as stepping
over and/or under the safety field must be prevented in any case. It must be impossible to approach the point of
danger without passing through the safety field.
The safety field is located between the line at which light is emitted at the emitter and the line at which light is
received at the receiver. The boundaries of the safety field are obvious on the devices.
3.3 Calculating Safety Clearance
Calculation of safety clearance S is based upon the EN ISO 13855 standard. However, if any special directives
and standards apply to the respective machine, these must be taken into consideration as well. Each contactless
safety device must be mounted such that stepping or reaching into the danger zone is precluded. If required, this
may also be accomplished by means of additional, mechanical safety devices.
Safety clearance S is the minimum distance in mm, measured from the danger zone to the safety field, and is
calculated per EN ISO 13855 as follows:
S [mm] = ( K [mm/s] × T [s] ) + C [mm]
S = minimum clearance in mm, measured from the danger zone to the safety field
K = approach speed in mm per second
T = t1 + t2 = total response time in seconds
t1 = safety device response time in seconds
t2 = machine or process over-travel time in seconds
C = additional clearance depending upon beam clearance/resolution in mm
