Safety devices for industrial and building purposes are important part of overall safety structures. In some countries mainly in USA are industrial process well equipped with this safety tools

1. THE BEST VIRTUAL EXPO FOR INDUSTRIAL AUTOMATION
PRODUCTS
Introduction to :
Safety light barriers

2. Safety light barriers These devices are used as entry, danger
point or danger zone guards to prevent people working in
highly critical conditions from various harm. They can be
classified as types of electro- sensitive protective equipment
that cut off dangerous movements and initiate safe conditions
when persons or objects approach the dangerous
zones. There are many different types of barriers that are
found in different industries and applications are as Below:
Safety light barriers Retro reflective light barriers
Type 4 safety light barriers Multiple-beam light barriers
Type 2 safety light barriers Reflex safety light barriers
Measuring light barriers

3. Ty p e 4 s a f e t y l i g h t b a r r i e r s
Type 4 safety light barriers -These types of safety
light barriers have redundant automatic self-
checking circuits employed in them. This ensures
that there is constant protection and warnings in
cases of potential danger signs.
These safety light barriers have an effective
optical angle that minimize interference from
reflective surfaces. Type 4 safety light barriers
can be used in highly risky and dangerous
environments due to their high sensitivity and
action based reflex reaction.

4. Ty p e 2 s a f e t y l i g h t b a r r i e r s
Unlike type 4 safety light barriers, type two
safety light barriers do not have redundant
circuit properties. This means that the safety
performance of these barriers is a bit limited and
absolute care should be considered in high risk
areas. Type 2 light barriers can not detect failure
of a single component in a system within a
defined response time.
Type 2 light barriers' wide optical angle makes
them prone to interference from reflective
surfaces as compared to type 4 ones. It is
important to use type 2 safety light barriers in
areas with lower risks as type 4 safety light
barriers are costly and should be used only in
high risk areas to ensure cost effectiveness and
accuracy.

5. M e a s u r i n g l i g h t b a r r i e r s
Measuring can be used by safety light barriers to
estimate the potential of a specific risk and carry
out the most appropriate response that is
required. By measuring specific frequencies that
pose as great dangers to machine operators,
Safety light barriers can warn the users via the
standard units used in these machinery.
Measuring is the ability to assign numbers to
objects or events that may be considered as an
evaluation or basis of comparison. Most of the
electrical equipments are fitted with measuring
equipments that are meant to measure various
variables involved.

6. R e t r o r e f l e c t i v e l i g h t
b a r r i e r s
Retro reflector devices are those devices that
reflect back to their source with minimum
scattering. They are made up of electromagnetic
wave fronts reflected along vectors that are
parallel to but opposite in direction from the
waves source.
Equipments with retro reflective abilities can be
used mainly at night as they may be difficult to
observe during the day. Safety light barriers fitted
with retro reflective equipment can make
them more efficient as workers have the ability of
being protected in dark areas. These makes
them must have elements in safety light barriers
used in the dark.

7. M u l t i p l e - b e a m l i g h t
b a r r i e r s
The multiple beam light barriers works
on principle that is based on situating two
surfaces of high reflectivity in close proximity
and then using a lens to converge beams that
have undergone multiple reflection between the
surfaces.
Multiple beam properties can be used in safety
light barriers to minimize interference from
reflector surfaces when working under very high
reflection environments that may make it
problematic to work in during normal conditions

8. R e f l e x s a f e t y l i g h t b a r r i e r s
Reflex safety light barriers is an involuntary and
nearly simultaneous movement in response to a
stimulus. Reflex in electronics can be referred to
as electrical devices that sense activities inside
machinery and are designed to give the most
appropriate reactions to achieve the set
functions.
They can either initiate or stop further action
from taking place. The ability of safety light
barriers to easily recognize potential danger and
act on impulse to initiate safety measures
proves the fact that reflex is a key element in
safety light barriers. Safety light type 4
barriers can be said to have even more reflex
abilities than safety type 2 ones.

9. Protection relays
Contact details :
VISUM Ltd.
Letna 40
040 01 Kosice
Slovakia - E.U.
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