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57-642 ECLIPSE Model 705 Guided Wave Radar Transmitter for Hygienic Industries
Appendix A: GWR – Emitted Energy
The ECLIPSE Model 705 far exceeds the OSHA health and
safety requirements for nonionizing radiation. OSHA
Standard 29 CFR 1910.97 covers non-ionization radiation.
Section (a)(2)(i) states:
“For normal environmental conditions and for incident electro-
magnetic energy of frequencies from 10 MHz to 100 GHz, the
radiation protection guide is 10 mW/cm
2
(milliwatts per square
centimeter) as averaged over any possible 0.1–hour period.”
The ECLIPSE signal is within this frequency range. No sig-
nals are intentionally radiated away from the probe.
ECLIPSE complies with FCC Part 15, Subpart B as an
unintentional radiator. It is authorized under the verifica-
tion process.
Under the authorization process, the emissions of ECLIPSE
must be within the limits listed in the table in section
15.109(a). The highest field strength listed in the table 500
µV/m (microvolts per meter) at three meters. ECLIPSE has
a 0.1% duty cycle. For a worst case calculation, let us
assume a 100% duty cycle. This assumption correlates to
the ECLIPSE generating a continuous signal for 0.1 hours.
Field strength is related to power density by the equation:
Power density - (field strength
2
/(the impedance of air in free
space), where the impedance of air in free space is 377
ohms.
The result is power density of 0.066 pW/cm
2
(picowatts per
square centimeter) at three meters or 6.4 pW/cm
2
at one
foot. These values are from the one billion to ten billion
times smaller than the OSHA guideline. For a 0.1% duty
cycle, these numbers become even smaller by a factor of
1000.
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