Mounting
Micropilot M FMR 231 with HART/4...20 mA
16
E Hauser
Measuring conditions
!
Note!
Please use FMR 230 in stilling well for the measurement of ammonia NH
3
.
•
The measuring range begins, where the beam hits the tank bottom. Particularly with
dish bottoms or conical outlets the level cannot be detected below this point.
•
In case of media with a low dielectric constant (groups A and B), the tank bottom can
be visible through the medium at low levels. In order to guarantee the required
accuracy in these cases, it is recommended to position the zero-point at a distance
C
above the tank bottom (see Fig.).
•
In principle it is possible to measure up to the tip of the antenna with FMR 230/231/
240. However, due to considerations regarding corrosion and build-up, the end of the
measuring range should not be chosen any closer than
A
(see Fig.) to the tip of the
antenna.
•
The smallest possible measuring range
B
depends on the antenna version (see Fig.).
•
The tank diameter should be greater than
D
(see Fig.), the tank height at least
H
(see Fig.).
•
Depending on its consistence, foam can either absorb microwaves or reflect them off
the foam surface. Measurement is possible under certain conditions.
L00-FMR2xxxx-17-00-00-en-017
A [mm/inch]
B [m/inch]
C [mm/inch]
D [m/inch]
H [m/ft]
FMR 231
50 / 2
> 0.5 / > 20
150...300/6...12
> 1 / > 40
> 1,5 / > 5
100%
0%
B
A
C
H
Ø D
