Product Data Sheet
00813-0100-4530, Rev AA
Catalog 2008 - 2009
Rosemount 5300 Series
Level-12
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 in applications
where the probe is fully submerged in the liquid.
When measuring interface, part of the pulse which
was not reflected at the upper product surface,
continues until reflected at the lower product surface.
The speed of this pulse depends on the dielectric
constant of the upper product.
If interface is to be measured, follow these criteria:
• The dielectric constant of the upper product
must be known and should not vary. The
RadarMaster software has a built-in dielectric
constant calculator to help the user to estimate
the upper product dielectric constant.
• The dielectric constant of the upper product
must have a lower dielectric constant than the
lower product.
• The difference between the dielectric
constants for the two products must be larger
than 6.
• Maximum dielectric constant for the upper
product is 10 for the coaxial probe, 7 for the
twin lead and 8 for the single lead probes.
• The upper product thickness must be larger
than 5.1 in. (0.13 m) for all probes except the
HTHP coaxial probe, which requires 8 in.
(0.2 m), to distinguish echoes from the two
liquids.
Maximum allowable upper product thickness /
measuring range is primarily determined by the
dielectric constants of the two liquids.
Target applications include interfaces between oil /
oil-like and water / water-like liquids with low (<3)
upper product dielectric constant and high (>20)
lower product dielectric constant.
For such applications, the maximum measuring
range is only limited by the length of the coaxial, rigid
twin and rigid single
lead probes.
For the flexible probes, the maximum measuring
range will be reduced depending on the maximum
upper product thickness according to the diagram
below. The maximum interface distance is 164 ft
(50 m) minus the maximum product thickness.
Emulsion Layer
Sometimes there is an emulsion layer (mix of the
products) between the two products which can affect
interface measurements. For assistance with
emulsion applications, consult factory.
5302
5301
Interface
Level
Level
Level =
Interface
Level
Interface Measurement with a Rosemount 5302 and a
Rosemount 5301 (fully submerged probe).
Maximum Upper Product Thickness for the Flexible Single
Lead Probe in ft (m)
Maximum Upper Product Thickness for the Flexible Twin
Lead Probe in ft (m)
(38 paginas)
(3 paginas)
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