Reference Manual
00809-0100-4731, Rev FA
April 2003
APEX
™
and APEX Sentry
™
Radar Gauge
2-12
Stilling Well, Bypass Cage, and
Bridle Connection Considerations
Apex and Apex Sentry can be mounted on bypass cages, bridles, and stilling
wells. Non-slotted stilling wells are preferred. If holes must be present, then 1
inch diameter holes approximately 0.5 meters apart are acceptable.
Higher dielectric materials (such as water-based compounds) in a stilling well
or bypass cage will create a strong return signal to the gauge. For this reason
smaller antennas should be used. Lower dielectric materials, (such as
hydrocarbons and solvents) will attenuate the signal so the antenna size
should be as large as possible for the bypass pipe or stilling well.
Figure 2-7. 3 inch or 4 inch
bypass cages can be used.
• Stilling wells should be non-slotted. The signal will be stronger because
it is contained within the stilling well. With higher dielectric fluids it is
possible for the signal to be too strong. If this is the case, try using a
smaller antenna.
• At the low end of the well or bridle, especially with joints or bends in
pipes the level or distance may be incorrect due to false reflections. Fill
with fluid to cover the area.
BYPASSCONNECTIONS.TIF
20mA
4mA
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