Datasheet

2011-03-07 SICK | REFLECTORS 5
Subject to change without notice
Acid and alkali-proof refl ectors
Sensors in the food and pharmaceuticals industry are subject
to special requirements. They have to be permanently resistant
to daily cleaning cycles with particularly aggressive chemical
cleaning agents, high cleaning temperatures and pressures
without any damage occurring to the sensor or refl ector or
impairment to its refl ective properties.
CHEM refl ectors by SICK will do justice to these requirements.
For details, see page 23.
Polarization
Photoelectric retro-refl ective sensors are available with or without polarizing
fi lter. The polarizing fi lter ensures that even highly-refl ective objects in the
beam path will be reliably detected. To do this, the light emitted is coded by
the sensor’s polarizing fi lter in a certain way. The refl ector changes the code
of the emitted light in a defi ned way and sends this back to the sensor. Only
if the receiver of the photoelectric retro-refl ective sensor receives the light with
this modifi ed code it will be interpreted by the sensor as an “unobstructed
light path” i.e. “No object in the beam path”. If the emitted light is refl ected
by another refl ective object but there is no code, the sensor will register an
object in the light path.
All SICK refl ectors have this code-changing property. The only exceptions are
a few refl ective tapes. These are referred to explicitly in the data sheets for
the relevant tape that follow.
The right refl ector for virtually all applications
Most applications in industrial environments can be catered for
using standard plastic refl ectors or refl ective tapes. Special applica-
tions require special sensors and refl ectors however. SICK therefore
offers a wide range of special solutions:
• Chemically-resistant reflectors
• Heatable reflectors (regulated and unregulated)
• Reflectors for high-temperature use
• Antifog reflectors
• Single-triple glass reflectors
• Dust-resistant and air-rinsed reflector solutions
• Large, premounted reflector plates
• Plus many more