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Contrinex Industrial Electronics
MINIMUM SAFETY DISTANCE CALCULATION (EU)
In the following figures and formulas, the minimum safety distance (S)
designates the distance between the beginning of the hazardous
area and the protective screen, or the furthest protective beam in
case of horizontal positioning of the AOPD.
According to EN/ISO 13855, the minimum safety distance depends on:
1. The approach speed of the body – or part thereof – to be detected
2. The total response time of the safety system :
a. Response time of the AOPD
b. Response time of the safety control unit
c. Machine stopping time (effective stopping of the machine’s
dangerous movement)
d. Any additional response delay
3. Resolution of the AOPD
Does
a Type-C
standard exist for this
machine ?
Is this
minimum distance
applicable ?
Identify hazards
Estimate and
evaluate the
level of risk
yes
yes
yes
no
no
no
Reduce overall response
time and/or parameter C*
Does
the minimum
distance allow persons
to be in the hazardous area
without being
detected ?
Select protective
device specified in
Type-C standard
Is distance
calculation specified in
Type-C standard ?
Calculate the minimum
distance using formulas
in ISO 13855
Calculate the minimum
distance as per Type-C
standard
Can the
overall response
time or parameter C*
be reduced
?
Select protective
device as advised in
Type-A & -B standards
yes
yes
no
Use the resulting
minimum distance
Use the resulting minimum
distance together with
complementary measures
depending on the risk
no
Use additional or
alternative protective
equipment
PROCESS STARTS
(* Dpf for US standards)
DIAGRAM 3: MINIMUM SAFETY DISTANCE EVALUATION PROCESS
