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APPENDIX
2. Horizontal installation
2.1 Equation for the calculation of the minimum distance
The detection zone is parallel to the direction of approach to the hazard zone
If the safety light curtain must be mounted in a horizontal position (Fig. 4), the distance between the dangerous area
and the most distant optical beammust be equal to the value calculated using the following equation:
S = 1600 mm/s (T1 + T2) + (1200 mm – 0.4 H)
where:
T1 = Response time of the ESPE in seconds
T2 = Machine stopping time in seconds.
H = Beam height from ground
H shall not be greater than 1000 mm, and however for values greater than 300 mm the risk of an undetected access
beneath the detection zone shall be taken in account during the risk assessment.
Furthermore, the lowest allowable height of the detection zone must satisfy this equation:
Hmin = 15 (d – 50)
Fig. 4 – Minimum installation distance (horizontal)
