Detection Capability (Resolution) (d)
Minimum Height (H)
117 mm (4.6 in)
1000 mm (39 in)
H should not be greater than 1000 mm (39 in)
This ensures detection of a given body part (e.g., thigh, leg, ankle) for a given resolution. For example, a Safety Zone with 70
mm resolution may not reliably detect an ankle (which requires a 50 mm resolution). Thus, the 70 mm resolution Safety Zone
is intended to reliably detect a leg and should be mounted 300 mm or more above the walking surface.
For a given Safety Zone height, the corresponding maximum detection capability (resolution) d can be calculated using the
following formula:
d = (H/15) + 50 mm
or
d = (H/15) + 2 in
Figure 27. A zone with 70 mm resolution is mounted no lower than 300 mm above the floor
Minimum
300 mm
WARNING:
•
Safety Zone height (stationary horizontal fields)
•
Where the height of a horizontal Safety Zone is H > 300 mm, there is a risk that a person can go
undetected beneath the field.
•
If it is possible for an individual to crawl undetected under the Safety Zone and access the hazard,
install supplemental guarding to prevent this access.
3.4 Minimum Safety (Separation) Distance for Stationary Applications
Response Time Considerations
— The SX’s mirror rotates every 30 ms (33.3 scans [revolutions] per second). The safety
outputs will switch off only after an object is detected in the Safety Zone for at least two consecutive scans. The SX’s
minimum response time is therefore 62 ms (2 × 30 ms + 2 ms).
To increase the SX’s reliability in an adverse environments (e.g., with fine airborne particles), increase the number of scans
required before the scanners safety outputs turn off. With each additional scan the response time (Tr) increases by 30 ms.
With K = 1600 mm/s the separation (safety) distance increases by 48 mm per additional scan.
WARNING:
•
Scanner Response Time Adjustments
•
Failure to follow this recommendation could result in serious bodily injury or death.
•
Do not increase the SX’s 62 ms response time for vertically positioned Safety Zones such as work
cell access (Entry/ Exit) or perimeter guarding applications where a person could move quickly
through the Safety Zone without being detected.
SX Safety Laser Scanner
34
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