TransCore 05531 User Manual

Encompass 4/4800 Multiprotocol Reader System Guide

Health Limits (865 to 875 MHz)

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

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

) aver-

aged over 6 minutes at 865 MHz.

Although not binding, other organizations such as the American National Stan-
dards 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

of:

Frequency (in MHz)
1500

Thus, the maximum permissible exposure for general population/uncontrolled
exposure at 865 MHz is 0.58 mW/cm

. 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.

Warning

At 2 W transmitted power and a distance of 19.7 inches (50 cm) from the reader,
the maximum power density calculated was less than 0.58 mW/cm

. Install the

reader at least 19.7 inches (50 cm) from the general public. Maintenance per-
sonnel must remain at least 9.1 inches (23 cm) from reader when system is oper-
ating.

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