Micropilot FMR51, FMR52
8 Endress+Hauser
Input
Measured variable
The measured variable is the distance between the reference point and the product surface.
The level is calculated from this distance, taking into account the empty distance "E" entered by the
user.
If required, the level can be converted into other variables (volume, mass) by means of a linearization
(up to 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 DC (ε
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.
For dielectric constants (DC values) of many media commonly used in various industries refer
to:
• the Endress+Hauser DC manual (CP01076F)
• the Endress+Hauser "DC Values App" (available for Android and iOS)
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