The wireless transmitters used for the City of Waukegan AMR Project use radio frequencies (RF) to transmit data. The exposures to RF from a wireless meter are much lower than many common household devices, including cell phones, laptop computers, and microwave ovens. The meters use a fraction of the power of a cell phone, and total daily transmission is less than 15 seconds per day.
COMPARISON OF TYPICAL RADIO FREQUENCY (RF) EXPOSURES
Relative Power Density in microwatts per square centimeter (mW/cm2)
FM Radio or TV Broadcast Station Signal: 0.005
AMR Transmitter: 0.32
Cordless Phones and Baby Monitors: 0.60
Wi-Fi: 10 – 20
Laptop Computer: 10 – 20
Cell Phone – Held up to head: 30 – 10,000
Walkie-Talkie – At head: 500 – 42,000
Source: Richard Tell Associates, Inc.
RF OUTPUT INFORMATION FOR THE WATER METER COMMUNICATION MODULE
Operating frequency of the meter communication module is in the Industrial, Scientific, and Medical (ISM) band at frequencies from 902 to 928 MHz.
The transmission time is extremely short, less than 10 milliseconds.
The module transmits a message every minute. Total transmission time is less than 15 seconds per day.
When not transmitting data, the module remains off.
The module's power output is 0.516W (the average lightbulb is 60W)
The FCC guideline for Maximum Permissible Exposure (MPE) is 6.10 mW/cm2 at 20 cm.
The meter communication module power density is 0.215 mW/cm2 at 20 cm.