Table 40 - Dielectric Constants Required By Application; Figure 32: Two Liquids Non-Flooded - Honeywell SLG 700 Option Manual

Two Liquids Non-Flooded: In this application there are also two liquid products in the tank, however,
the tank is not normally full so that there is a vapor above the Upper Product, as shown below in
Figure 32. The SLG 700 measures the total level of the products in the tank as well as the level of the
interface (boundary) between the two liquid products in the tank.
Vapor Dielectric Constants:
Depending on the selection above, the user interface allows users to enter values for the dielectric
constant (DC) for each of the products present, as shown in Table 22.
Single Liquid
Vapor DC
Product DC
The dielectric constant of most gasses is very close to 1.0 and the Vapor Dielectric Constant parameter will most
often not need to be edited. Enter the correct value if it is significantly different than 1.0.
Upper Product/Lower Product:
For liquid products the dielectric constants vary much more. For the two liquid applications, the value
entered for the Upper Product Dielectric Constant will have a significant impact on the accuracy of the
reported Interface Level.
Two Liquids Flooded, Two Liquids Non-Flooded. Entering of the correct value for the DC of the
Upper Products ensures accurate measurement of the Interface, because the speed of the measuring
signal varies with the DC of the Upper Product.
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Figure 32: Two Liquids Non-Flooded

Table 22 - Dielectric Constants Required by Application
Two Liquid Non-Flooded
Vapor DC
Upper Product DC
Lower Product DC
FOUNDATION Fieldbus Option User's Guide
Two Liquid Flooded
Upper Product DC
Lower Product DC
Rev. 3.0