Preventive Maintenance Guidelines
120 Administrator Guide v 2.2 Thermo Scientific Smart-Vue
®
Wireless Monitoring Solution
with obstacles, the attenuation value depends largely on the type of obstacle.
Metallic obstacles reflect radio waves strongly, while water largely absorbs
the signal.
CAUTION: It is important for the wireless signal strength for Smart-Vue
modules indicated in Smart-Vue Client to be 40% or higher. If the signal
strength for any given module or repeater is lower than 40%, then you must
try to reposition modules for better performance or consider using one or
more repeaters to achieve a stronger end-to-end signal. If the signal is too
weak, the module will generate an increased number of technical alarms.
CAUTION: The average signal should never show a level lower than 40%.
22.1.2.1 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:
The main factors that decrease coverage include:
Table 3: Wireless Interference in Various Environments.
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, electrical conduits, elevator
shafts
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