Endress+Hauser Micropilot FMR60B Technical Information page 7

Micropilot FMR60B HART
Endress+Hauser
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A Antenna tip + 10 mm (0.4 in)
B Smallest possible measuring range
C Distance above tank floor = 50 to 80 mm (1.97 to 3.15 in); (water-based medium εr = 2)
H Vessel height > 0.7 m (2.3 ft)
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
• A0 (ε 1.2 to 1.4)
r
e.g. n-butane, liquid nitrogen, liquid hydrogen
• A (ε 1.4 to 1.9)
r
Non-conductive liquids, e.g. liquefied gas
• B (ε 1.9 to 4)
r
Non-conductive liquids, e.g. gasoline, oil, toluene, etc.
• C (ε 4 to 10)
r
e.g. concentrated acid, organic solvents, ester, aniline, etc.
• D (ε >10)
r
Conductive liquids, aqueous solutions, diluted acids, bases and alcohol
Measurement of the following media with absorbing gas phase
For example:
• Ammonia
• Acetone
• Methylene chloride
• Methyl ethyl ketone
• Propylene oxide
• VCM (vinyl chloride monomer)
To measure absorbing gases, either use a guided radar, measuring devices with another
measuring frequency or another measuring principle.
If measurements must be performed in one of these media, please contact Endress+Hauser.
For the dielectric constants (DC values) of many media commonly used in industry, please refer
to:
• Dielectric constant (DC value) Compendium CP01076F
• The Endress+Hauser "DC Values app" (available for Android and iOS)
Measurement in storage vessel
Storage vessel - measuring conditions
Calm medium surface (e.g. bottom filling, filling via immersion tube or rare filling from above)
C
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