11
58-610 Model R82 Radar Transmitter
2.3.3.3 Problematic Applications; GWR Alternative
Some application concerns can be problematic for Radar.
For these, Guided Wave Radar is recommended:
• Extremely low dielectric media (
ε
r
<2.0)
• Very weak reflections from the liquid surface, particularly
during turbulence, can cause poor performance.
• Tanks heavily cluttered with false targets (mixers, pumps,
ladders, pipes, etc.)
• During times of very low liquid levels of low dielectric
media, the metal tank bottom may be detected deteriorat-
ing performance.
2-inch (50 mm) Antenna
8-inch (200 mm) Antenna
13"
(330 mm)
7"
(178 mm)
15" (380 mm),
BSP: 16" (405 mm)
minimum
(measured from
bottom of threads or
flange face)
2-inch (50 mm) Antenna
Maximum Recess (
m
) is 2
×
Nozzle Diameter (
d
) (Schedule 40 maximum)
(example: 2" diameter nozzle)
8-inch (200 mm) Antenna
Maximum
Liquid Level
Maximum
Liquid Level
m
d
15" (380 mm),
BSP: 16" (405 mm)
2" (50 mm)
4" (100 mm)
15" (380 mm),
BSP: 16" (405 mm)
8" (200 mm)
9" (225 mm)
3" (75 mm)
4" (100 mm)
d
Figure 8
Minimum distance to end of antenna varies
depending on antenna used
Figure 9
Using nozzle height to maximize useable tank space
