Envipco U48DFF, Service Manual

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3-7
Sensor Tunnel
3.3.4. Materials Sensors
By the time a container reaches the end of the front conveyor, it passes five retro-reflector materials sen-
sors. As shown in Figure 3-4 on page 3-5, the emitters are lined up along the left side of the In-Feed,
and the reflectors are across from the emitters along the right side of the In-Feed. The function of the
material sensors is to determine the position of containers along the conveyor. The
RVM
software uses
this information to optimize container acceptance for speed and accuracy.
3.3.5. PET Sensor
The
PET
sensor emitter is at the left rear of the In-Feed. The receiver is across from the emitter on the
right. The
PET
sensor works by emitting a beam of light through the container and receiving the dis-
torted beam on the other side. If the container is
PET
, the receiver recognizes its light pattern. The
RVM
uses this information for sorting and to determine acceptance or rejection.
3.3.6. Light Curtain
The Light Curtain is an array of sensor emitters and receivers at the rear of the Sensor Tunnel. The emit-
ters are located on the right rear of the Sensor Tunnel, and the receivers are located on the left rear of the
Sensor Tunnel. See Figure 3-4 on page 3-5 for the location of the Light Curtain. These sensors deter-
mine if anything is blocking the rear of the In-Feed. This functionality aids the speed of acceptance and
prevents jams. It also keeps the Sorter from rotating if someone puts a hand into the back of the feed.
Figure 3-7 illustrates the range of the emitters and receivers.
FIGURE 3-7.
Light Curtain Sensor Array