LINK Systems Max Presence Sensing Device - Manual (Page 31)

Link Lite Black Max Section 3 - Installation
3-26
have a body part in the hazardous area
without being detected. If remote segment
Black Max units are not used to detect a
person standing between the primary
sensing field created by the main transmit-
ter and receiver and the hazard (see section
3.4.2), then barriers must be installed to
keep someone from passing completely
through the Black Max sensing field
toward the hazard.
Barriers installed to prevent people from
reaching over, under, or around the Black
Max(s) sensing field(s) must meet several
OSHA construction requirements. These
are:
1. The guard should prevent reaching
over, under, or around the guard and into
the point of operation, except through the
Black Max(s) sensing field(s).
2. Openings in the guard must meet the
requirements of OSHA Table 0-10.
3. The barrier must be installed so that it
doesn't create hazards (such as pinch
points) between the guard and moving
machine parts.
4. Unless the barrier is interlocked with
the machine control to prevent hazardous
action of the machine when it is not in
place, it should use fasteners that require
tools to remove.
Barriers to prevent someone from assuming
a position between a Black Max sensing
field and the hazard without being detected
must be installed to prevent a persons body
from passing completely through the Black
Max sensing field as he approaches the
hazard.
Figures 3.23 through 3.26 give general
illustrations of the use of supplemental
barriers.
WARNING! Failure to install
supplemental barriers, when required,
may result in serious injury to someone
reaching the hazard through an opening
or area not sensed by the Black Max
light curtain(s).
Table 0-10
Distance of Opening Maximum Width
to Nearest Hazard of Opening
½” to 1 ½” ¼”
1 ½” to 2 ½” 3/8”
2 ½” to 3 ½” ½”
3 ½” to 5 ½” 5/8”
5 ½” to 6 ½” ¾”
6 ½” to 7 ½” 7/8”
7 ½” to 12 ½” 1 ¼”
12 ½” to 15 ½” 1 ½”
15 ½” to 17 ½” 1 7/8”
17 ½” to 31 ½” 2 1/8”