User's Manual

DRAFT
Micropilot FMR51, FMR52
8 V. 1, Rev. 8, 4-10-2012 Endress+Hauser
Input
Measured variable
The measured variable is the distance between the reference point and the product surface.
Subject to the empty distance entered "E" the level is calculated.
Alternatively, the level can be converted into other variables (volume, mass) by means of linearization (32
points).
Measuring range Maximum measuring range
Device Maximum measuring range
FMR51 - standard version 40 m (131 ft)
FMR51 - with "Advanced dynamics" application package 70 m (230 ft)
FMR52 - standard version 40 m (131 ft)
FMR52 - with "Advanced dynamics" application package 60 m (197 ft)
Usable 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.
Media groups
Media groups
DK (e
r
)
Example
A
1.4 to 1.9 non-conducting liquids, e.g. liquefied gas
1)
B
1.9 to 4 non-conducting liquids, e.g. benzene, oil, toluene, …
C
4 to 10 e.g. concentrated acids, organic solvents, esters, aniline, alcohol, acetone, …
D
> 10 conducting liquids, e.g. aqueous solutions, dilute acids and alkalis
1) Treat Ammonia NH
3
as a medium of group A.