Emerson Rosemount 3308 Series Reference Manual page 144

Specifications and reference data
February 2020
Figure A-1: Interface Level Measurement
39.4 (12)
32.8 (10)
26.2 (8)
19.7 (6)
13.1 (4)
6.6 (2)
A. Maximum upper product thickness, ft. (m)
B. Upper product dielectric constant
C. Lower product dielectric constant of 10
D. For example, with an upper product dielectric constant of 2, and a lower product
A.1.5 Accuracy over measuring range
The measuring range depends on probe type, dielectric constant of the product and
installation environment, and is limited by the Blind Zones at the very top and bottom of
the probe. In the Blind Zones, the accuracy exceeds ±1.18 in. (30 mm), and measurements
may not be possible. Measurements close to the Blind Zones will have reduced accuracy.
The following conditions will impact the Blind Zones:
• If the single lead probes or twin probes are installed in a nozzle, the nozzle height shall
be added to the specified Upper Blind Zone.
• The measuring range for the PTFE covered flexible single lead probe includes the
weight when measuring on a high dielectric media.
144
A
D
0
1 2 3 4 5
25 ft. (7 m)
DC2
DC20
dielectric constant of 20, the maximum upper product thickness is 25 ft. (7 m).
C
6 7 8 9 10 11
Reference Manual
00809-0100-4308
B
Rosemount 3308 Series