Mounting
Leuze electronic GmbH + Co. KG
ELC 100
20
5.1.3
Minimum distance to reflective surfaces
WARNING
Failure to maintain minimum distances to reflective surfaces may result in serious injury!
Reflective surfaces can indirectly deflect the transmitter beams to the receiver. In this case, in-
terruption of the protective field is not detected.
Ä
Determine the minimum distance a (see figure below).
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Make certain that all reflective surfaces are the necessary minimum distance away from the
protective field according to IEC/EN IEC 61496-2 (see the following diagram “Minimum dis-
tance to reflective surfaces as a function of the protective field width”).
Ä
Check that reflective surfaces do not impair the detection capability of the safety sensor be-
fore start-up and at appropriate intervals.
Ä
After mounting, check the detection capability of the safety sensor in the entire protective
field using a test rod (see chapter 8.3.1 "Checklist – periodically by the operator").
a
b
c
a
Required minimum distance to reflective surfaces [mm]
b
Protective field width [m]
c
Reflective surface
Fig. 5.2:
Minimum distance to reflective surfaces depending on protective field width
a
900 mm
200 mm
800 mm
300 mm
400 mm
600 mm
500 mm
700 mm
3 m
5 m
10 m
b
131 mm
15 m
20 m
25 m
1100 mm
1000 mm
a
Required minimum distance to reflective surfaces [mm]
b
Protective field width [m]
Fig. 5.3:
Minimum distance to reflective surfaces as a function of the protective field width
Tab. 5.2:
Formula for calculating the minimum distance to reflective surfaces
Distance (b) transmitter-receiver
Calculation of the minimum distance (a) to reflective sur-
faces
b ≤ 3 m
a [mm] = 131
b > 3 m
a [mm] = tan(2.5°) × 1000 × b [m] = 43.66 × b [m]
