8.1 Typical Muting Applications
8.1.1 Entry/Exit Applications
The muting devices must be placed to ensure that the points that trigger the mute’s start and end are very close to the
safety light screen’s sensing field. This prevents personnel from following, or being pushed by, the object into the
hazardous area without interrupting the safety light screen before the mute window opens or at the time the mute window
closes.
When two pairs of opposed-mode photoelectrics are used as muting devices, as shown below, the crossing point of the
two sensing paths must be on the hazardous side of the safety light screen. The safety light screen will be interrupted
before any personnel would be able to block both beams and mute the system. The devices should detect the material and
not the pallet or the transport in order to hinder an individual from riding into the hazardous area.
Carrier Basket
Hard Guarding
M1
M2
Light Screen Receiver
Light Screen Emitter
Safety Mat or
Horizontally Mounted
Safety Light Screen
Hazardous Area (which
is being protected from
personnel entry)
Safe Area (free
movement of
personnel)
Figure 29. X-Pattern Entry/Exit system using two pairs of opposed-mode photoelectric muting devices
M1
(Emitter)
Light Screen
Defined Area
M1 *
M2
(Receiver)
M2 *
* Sensor not shown
Figure 30. Horizontal photoelectric muting devices placed at different
heights
M1
(Emitter)
Light Screen
Defined Area
M1 *
M2
(Receiver)
M2 *
* Sensor not shown
Figure 31. Photoelectric muting devices placed diagonally
WARNING:
• Verify That Unintentional Muting is Not Possible
• Failure to follow these instructions could result in serious injury or death.
• Position the crossing point of the photoelectric beams in the hazardous area so that it is not
accessible by personnel. An individual must not be able to block both photoelectric beams and
initiate a mute condition.
EZ-SCREEN Low-Profile System with Integral Muting
54
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