TransCore 05531 User Manual

Within the United States, environmental guidelines regulating safe exposure levels are 
issued by the Occupational Safety and Health Administration (OSHA).

Section 1910.97 of OSHA Safety and Health Standards 2206 legislates a maximum 
safe exposure limit of 10 milliwatts per square centimeter (mW/cm

2

) averaged over 6 

minutes at 902 MHz.

Although not binding, other organizations such as the American National Standards 
Institute (ANSI) have issued similar guidelines that are more restrictive than the 
OSHA limits (ANSI C95.1). ANSI guidelines recommend a maximum safe power 
density in mW/cm

2

 

of:

Frequency (in MHz)
         1500

Thus, the maximum permissible exposure for general population/uncontrolled expo-
sure at 902 MHz is 0.60 mW/cm

2

. The power limit is a six-minute average.

The RF power density generated by the Encompass 4/4800 Multiprotocol Reader was 
calculated using a maximum antenna gain of 9.5 dBi, equivalent to the antenna gain of 
the internal antenna.

The data confirms that the TransCore Encompass 4/4800 Multiprotocol Reader effec-
tively meets OSHA requirements and thus does not represent an operating hazard to 
either the general public or maintenance personnel.