Troubleshooting guide

106
Reference Manual
00809-0100-4308, Rev BA
Appendix A: Reference Data
December 2014
Reference Data
A.1.6 Interface measurements
The Rosemount 3308 Series is well suited for interface measurements, including applications
where the probe is fully submerged in the liquid.
Figure A-3. Interface Level Measurement
If interface is to be measured, follow these criteria:
 The dielectric constant of the upper product must be known and should not vary. The
AMS Wireless Configurator and Field 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 4.9 in. (12.5 cm) when the upper
product is oil (DC=2.2) and the lower product is water (DC=80).
For guidelines on emulsion situations, consult your local Emerson Process Management
representative.
Interface Level
Interface Level
Product Level
Interface Measurement Interface Measurement with
fully submerged probe