Reference Manual
00809-0100-4731, Rev FA
April 2003
1-7
APEX
™
and APEX Sentry
™
Radar Gauge
APEX /Hybrid
System Overview
(APEX Radar
Gauge Only)
To maximize the number of available on-line inventory measurements, you
can install and combine an APEX Radar Gauge with a Rosemount
industry-leading pressure transmitter to create a hybrid system (see Figure
1-3). A hybrid system offers the best advantages from both level-based and
pressure-based tank gauging systems:
• Offers all the advantages of the APEX and HTG technologies
• Provides level, volume, mass, and true average
density measurements
• Enhances plant safety since no manual operations are necessary
• Handles traditional problems such as density stratification
For further installation details, please see page 2-1, and refer to the certified
wiring diagrams provided.
Figure 1-3. Hybrid System
Option
Addressing Concerns
about Exposure to
The APEX and APEX
Sentry Radar Gauges
The Federal Communications Commission has issued a bulletin called
Questions and Answers About Biological Effects and Potential Hazards of
Radio frequency Radiation (OET Bulletin No. 56, Third Edition, January
1989). This document states a recommended power density limit of 5
mW/cm
2
in the frequency range of 1.5–100 GHz. This limit is based on a 1982
ANSI guideline for a time-averaged exposure for humans.
The maximum power density emitted from APEX and APEX Sentry Radar
Gauges is approximately 1.1 mW/cm
2
, which is below the ANSI guideline.
When the gauge is mounted in a metal vessel, the emissions external to the
vessel are much lower than the 1.1 mW/cm
2
measured at the antenna.
For additional information about the safety of radar signals, see Appendix A:
Reference Data.
LEVEL- 2510_04A
APEX
Radar Gauge
Optional
RTD
Optional Pressure Transmitter
Model 3402 AIM
RS 485
RS 232
Output
HART
Communicator
MCAP
Output
Model 3201
HIU
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