Reference Manual
00809-0100-4731, Rev FA
April 2003
2-9
APEX
™
and APEX Sentry
™
Radar Gauge
General Vessel
Considerations
Heating Coils and Agitators
If the vessel contains heating coils or agitators (see Figure 2-2), they may
create noise when the radar signal bounces off of them. The noise level is
less if the signal contacts a non-flat surface (for example, round pipe, angled
blade, etc.) that causes the signal to scatter rather than directing it back to the
antenna. To avoid these problems, try to make sure that heating coils or
agitators are below the minimum product level or within the null zones (see
Figure 2-3 on page 2-9 and Figure 2-3 on page 2-9).
Figure 2-3. User-Programmable
“Null” Zones for
APEX and APEX Sentry Radar
Gauges
Cables, Floats, Baffles, or Trays
Cables, floats, baffles, or trays can introduce noise into the radar signal. A
vertical cable or rounded surface causes minimal effect because the radar
signal is scattered rather than directed back to the antenna. To reduce the
amount of noise from cables, floats, baffles, or trays, position the gauge such
that the beam will not contact them.
High Level Switch
URV (20 mA)
LRV (4 mA)
Upper
Null
Zone
Reference
Gauge Height
Reference Line
Lower
Null
Zone
Radar gauge will not measure below this line.
-19.6 in.
(-0.5 m)
Radar gauge will not
measure above this line.
LEVEL-0579A
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