Emerson Rosemount 3308 Series Reference Manual page 156

Specifications and reference data
February 2020
Figure A-10: Interface Level Measurement
A. Product level
B. Interface level
If interface is to be measured, follow these criteria:
• The dielectric constant of the upper product should be known and should not vary. The
AMS Wireless Configurator and handheld communicator have a built-in Dielectric
Constant Guide to assist users in determining the dielectric constant of the upper
product.
• The dielectric constant of the upper product must have a lower dielectric constant than
the lower product to have a distinct reflection.
• The difference between the dielectric constants for the two products must be larger
than 10.
• Maximum dielectric constant for the upper product is 10 for the coaxial probe, and 5
for the single lead and flexible twin lead probes.
• Minimum detectable upper product thickness is 4 in. (10 cm) when the upper product
is oil (DC=2.2) and the lower product is water (DC=80).
Sometimes there is an emulsion layer (mix of the products) between the two products
which can affect interface measurements. For guidelines on emulsion situations, consult
your local Emerson representative.
For additional information, see the Guided Wave Radar Interface Measurement
Note.
Related information
Interface measuring range
156
Reference Manual
00809-0100-4308
Technical
Rosemount 3308 Series