Micropilot M FMR 231 with HART/4...20 mA
Mounting
E 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 all Micropilot M (larger ranges up to 35 m (114 ft)
on request).
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 231
Product class
DK (
ε
r)
Examples
A
1,4...1,9
non-conducting liquids, e.g. liquefied gas
1)
1)
Treat Ammonia NH3 as a medium of group A, i.e. use FMR 230 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
Bypass
Measuring range
Measuring range
Measuring range
Measuring range
Measuring range
FMR 231:
Rod antenna
Rod antenna
Rod antenna
Rod antenna
Rod antenna
A
DK(
ε
r)=1,4...1,9
to use a stilling well (20 m / 67 ft) or Wave Guide antenna
1
(3.8 m /12.5 ft)
Use FMR 230,
FMR 240,
FMR 244
resp. FMR 245
Use FMR 230,
FMR 240,
FMR 244
resp. FMR 245
B
DK(
ε
r)=1,9...4
10 m
5 m
4 m
C
DK(
ε
r)=4...10
15 m
7,5 m
6 m
D
DK(
ε
r)>10
20 m
10 m
8 m
1)
In the event of horizontal stress, mechanical support is required or provide the Wave Guide antenna with a protective pipe.
