Reference Manual
00809-0100-4731, Rev FA
April 2003
2-15
APEX
™
and APEX Sentry
™
Radar Gauge
Figure 2-11. Beamwidth vs.
Distance from APEX and APEX
Sentry Radar Gauge to Tank
Bottom
NOTE
A larger antenna yields a tighter and more concentrated signal.
This is an important consideration when using the gauge in various
applications with such characteristics as agitation and/or low
dielectric constants.
Antenna Size Beam Angle
2-in. 22.9°
3-in. 13.7°
4-in. 10.5°
D
LEVEL-0038A
Beam Angle
r
Example: the beam radius (r) at the
bottom of a 10-foot (3.05 m) (D)
vessel would be 0.9 ft (0.28 m) for
a 4-inch antenna.
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