Micropilot FMR53, FMR54
Endress+Hauser 9
Input
Measured variable
The measured variable is the distance between the reference point and the product surface.
The level is calculated based on "E", the empty distance entered.
Optionally, the level can be converted to other variables (volume, mass) by linearization (32 points).
Measuring range Maximum measuring range
FMR53 Maximum measuring range
For all versions 20 m (66 ft)
FMR54 Maximum measuring range
Horn antenna 20 m (66 ft)
Planar antenna in stilling well 38 m (125 ft)
Usable measuring range
The usable measuring range depends on the antenna size, the medium's reflective properties, the
installation position and any possible interference reflections.
The media groups and the possible measuring range are described as a function of the application
and media group in the following section. If the dielectric constant of the medium is not known, to
ensure a reliable measurement assume the medium belongs to group B.
Media groups
Media group ε
r
Example
A 1.4 to 1.9 Non-conductive liquids, e.g. liquid gas
1)
B 1.9 to 4 Non-conductive liquids, e.g. gasoline, oil, toluene, etc.
C 4 to 10 E.g. concentrated acid, organic solvents, ester, aniline, alcohol, acetone.
D > 10 Conductive liquids, aqueous solutions, diluted acids and bases
1) Treat ammonia gas (NH
3
) like "group A" media.
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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