16
Reference Manual
00809-0100-4530, Rev DD
May 2016
2.7.6
Interface
Rosemount 5302 is the ideal choice for measuring the level of oil, and the interface of oil
and water, or other liquids with significant dielectric differences. Rosemount 5301 can also
be used for interface measurement in applications where the probe is fully submerged in
the liquid.
Figure 2-9. Interface Level Measurement
For measuring interface level, the transmitter uses the residual wave of the first reflection.
Part of the wave, not reflected at the upper product surface, continues until it is reflected at
the lower product surface. The speed of this wave depends fully on the dielectric constant
of the upper product.
All probes can be used for measuring interfaces. Single probes are the preferred choice in
almost all applications but depending on the application and installation geometries a
coaxial probe or a twin probe may be a better fit.
The maximum allowable upper product thickness/measuring range is primarily determined
by the dielectric constants of the two liquids. Typical applications include interfaces
between oil/oil-like and water/water-like liquids. For such applications, the upper product
dielectric constant is low (<3) and the lower product dielectric constant is high (>20). Refer
to
“Interface measurements” on page 224
for further interface application guidelines.
Emulsion layers
Sometimes an emulsion layer (mix of the products) forms between the two products and
can affect interface measurements. For assistance with emulsion applications, consult your
local Emerson Process Management representative.
Product Level and
Interface Level
Product Level
Interface Level
Interface Level
Rosemount
5302
Rosemount
5301
Interface Level with
submerged probe
Содержание 5300 Series
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