Preventive Maintenance Guidelines
26
Smart-Vue Administrator Manual Thermo Fisher Scientific
2.1.2.4 Environment-related
properties
The weakening of wireless signals is largely due to the properties of the
environment crossed by the radio waves. This table shows some sample
attenuation properties for various materials:
Table 3. Wireless interference in various environments
The main factors that decrease coverage include:
• Module mounted on metal surfaces (typically 30% loss of range)
• Hollow, lightweight walls filled with insulating wool on metal foil
• Hanging ceilings with panels made of metal or carbon fiber
• Steel furniture, lead glass or glass with metal coating
Fire-safety walls, elevator shafts, staircases and supply areas should be
considered as screening (causing a screen). Avoid screening by
repositioning the transmitting and/or receiving antenna away from the
radio shadow, or by using a repeater.
Materials Attenuation Examples
Air None Open space, interior courtyards
Wood Low Doors, floors, walls
Plastic Low Barriers
Glass Low Non-tinted glass
Tinted glass Medium Tinted glass
Water Medium Aquariums, fountains
Living
beings
Medium Crowds, animals, people, plants
Brick Medium Walls
Plaster Medium Dividing walls
Ceramic High Tile
Paper High Rolls or reams of paper
Concrete High Heavy walls, floors, pillars
Safety glass High Bulletproof windows
Metal Very high
Reinforced concrete, mirrors,
metal cabinets, elevator shafts
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