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Appendix B
Hard Guarding
M1
Carrier
Basket
M2
Figure B-4. Entry/exit system using 4 whisker/limit switches as muting devices
Hard Guarding
A ≥ (speed of line ft/sec) x 0.1 sec.
B ≈ 3" (suggested position must hinder personnel
following muted object)
C ≤ Length of carrier basket
D < (speed of line ft/sec) x 3.0 sec., but beams M1 and M2
must be far enough apart to hinder an individual
from triggering both sensors.
One-way (directional) muting can be used in "Exit" applications to reduce the possibility of intentional defeat.
Figure B-5. An entry/exit system using four photoelectric sensors as M1, M2, M3, and M4
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M3
R
Light
Screen
E
M4
Transfer Line
Whisker/Limit
A B
Switches
C
M1 M2
Light
Screen
Carrier
Basket
D A
A ≥ (speed of line ft/sec) x 0.1 sec.
B ≈ 3" (suggested position must hinder
personnel following muted object)
C ≤ Length of carrier basket
– Trapping hazards must be avoided and
clearance requirements complied with.
– Switch actuators can not be so long that they
allow a single person to initiate a
muted condition.
– Polarized-retroreflective (with targets
mounted on carrier) and inductive
proximity sensors could be used in a
similar manner, if an individual can
not ride into the hazardous area.
One-way (directional) muting can be used
in "Exit" applications to reduce the
possibility of intentional defeat.
M3 M4
E
R
Safety Mat
B D
C
MM-TA-12B Muting Module
Instruction Manual