20
Contrinex Industrial Electronics
PERFORMANCE LEVEL (PL)
AVERAGE PROBABILITY OF DANGEROUS FAILURE PER HOUR
a
10
-5
≤
PFH
D
< 10
-4
b
3 x 10
-6
≤
PFH
D
< 10
-5
c
10
-6
≤
PFH
D
< 3 x 10
-6
d
10
-7
≤
PFH
D
< 10
-6
e
10
-8
≤
PFH
D
< 10
-7
TABLE 4 : AVERAGE PROBABILITY OF DANGEROUS FAILURE PER HOUR
All Safetinex Type 2 AOPDs fully comply to Performance Level c. For
details, please consult the product data sheet.
SPECIFIC STANDARDS FOR SAFETY DISTANCE CALCULATION
EN/ISO 13855 gives details concerning the positioning of safeguards
with respect to the approach speeds of parts of the human body.
INSTALLATION RULES
All safety equipment has to be installed following the strict installation
instructions given by the manufacturer and the applicable standards.
Without proper installation, the safety device cannot fulfill its function
and will give a false impression of safety to persons approaching a dan-
gerous machine. EN/ISO 13855 defines the installation requirements
for safety light curtains and access control barriers with respect to the
approach speeds of parts of the human body. Below is a summary of
the key concepts.
POSITIONING THE AOPD
The level of safety depends on the way the device is positioned. The
risk assessment conclusions will help decide what position is best suit-
ed for preventing foreseeable hazards. In order to ensure proper safe-
guarding, special care must be taken to find the position that will not
allow the protective device to be bypassed and such that any hazard-
ous machine movement is safely stopped before potential harm occurs.
There are different classical ways to position safety light curtains :
–
Vertically (“perpendicular approach”)
–
Horizontally (“parallel approach”)
–
In an L shape (vertically and horizontally combined)
–
Inclined (“angular approach”).
It must not be possible to pass over, below, around or go behind the
protective field. When positioning access control barriers, it must not
be possible to pass over the highest beam, below the lowest beam or
between two beams. If this cannot be guaranteed, then additional pro-
tective devices must be used.
INSTALLATION
EN/ISO 13855
EN/ISO 13855
