Micropilot M FMR244 with FOUNDATION Fieldbus
Mounting
Hauser
17
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 maximum configurable range is:
• 20 m (65 ft) for Micropilot M FMR23x/24x (larger ranges up to 35 m (114 ft) on request),
• 70 m (229 ft) for Micropilot M FMR250 (further informations see TI390F/00/en).
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.
Measuring range depending on vessel type, conditions and product for
Micropilot M FMR 244
Media group
DC (
ε
r)
Examples
A
1,4...1,9
non-conducting liquids, e.g. liquefied gas
1))
1)
Treat Ammonia NH
3
as a medium of group A, i.e. use FMR230 in a stilling well.
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
Storage tank
Calm product surface
(e.g. intermittent filling,
filling from bottom,
immersion tubes).
Buffer tank
Moving surfaces
(e.g. continuous filling, from
above, mixing jets).
Process tank with agitator
Turbulent surface.
Single stage agitator <60 RPM.
Stilling well
Measuring range
Measuring range
Measuring range
Measuring range
FMR 244 (horn dia):
40 mm / 1½"
40 mm / 1½"
40 mm / 1½"
40 mm / 1½"
A
DK(
ε
r)=1,4...1,9
to use a stilling well (20 m / 65 ft) or Wave Guide antenna
1))
(3.8 m /12.5 ft)
20 m / 65 ft
B
DK(
ε
r)=1,9...4
3 m / 10 ft
2 m / 7 ft
1 m / 3 ft
20 m / 65 ft
C
DK(
ε
r)=4...10
6 m / 20 ft
3 m / 10 ft
1.5 m / 5 ft
20 m / 65 ft
D
DK(
ε
r)>10
9 m / 30 ft
5 m / 16 ft
2 m / 7 ft
20 m / 65 ft
1)
In the event of horizontal stress (e.g. agitators), mechanical support is required or provide the Wave Guide antenna with a protective pipe (maximum lateral
load 100 Nm).
