Varec 7532, Installation And Operation Manual

Page: 15 / 106

15
7532 Mounting
Measuring range
The usable measuring range depends on the size of the antenna, the reflectivity of the
medium, the mounting location, and eventual interference reflections.
The following tables describe the groups of media as well as the achievable measuring
range as a function of application and media group. If the dielectric constant of a
medium is unknown, it is recommended to assume media group B to ensure a reliable
measurement.
1)Treat Ammonia NH3 as a medium of group A, e.g. always use a stilling well.
Measuring range depending on product class for 7532 RTG:
Product class DK (
ε
r) Examples
A
1.4 … 1.9 non-conducting liquids, e.g. liquefied gas 1)
B
1.9 … 4 non-conducting liquids, e.g. benzene, oil, toluene, …
C
4 … 10 e.g. concentrated acids, organic solvents, esters, aniline,
alcohol, acetone, …
D
> 10 conducting liquids, e.g. aqueous solutions, dilute acids and
alkalis
Product class Stilling well/ Bypass
Measuring range
7532 RTG
> DN150
A
DK(
ε
r)=1,4…1,9
38 m/124 ft
B
DK(
ε
r)=1,9…4
38 m/124 ft
C
DK(
ε
r)=4…10
38 m/124 ft
D
DK(
ε
r)>10
38 m/124 ft
max. measuring
range with custody
transfer approvals
20 m/65 ft