Blocking Distance - Endress+Hauser Levelflex M FMP41C Operating Instructions Manual

Levelflex M FMP41C PROFIBUS PA
⇒
ENDRESS + HAUSER
–
+ E
!
Endress+Hauser
6.5

Blocking distance

Function "upper block. dist" (059)
For rod probes and for rope probes with lengths of up to 8 m, the upper blocking distance is preset
to 0.2 m on delivery. For rope probes with lengths of more than 8 m, the upper blocking distance
is preset to 2.5 % of the probe length. For media with DC > 7, the upper blocking distance for rod
and rope probes can be reduced to 0.1 m, if the probe is mounted flush with the wall or in a nozzle
of maximum 50 mm.
Blocking distance and measuring range
At the lower end of the probe there is no blocking distance but a transition region with reduced
accuracy, see section "Maximum measured error", → ä 59.
FMP41C
Rod probe
Rope probe
1) The indicated blocking distances are preset. At media with DC > 7, the upper blocking distance UB can be reduced
to 0.1 m for rod and rope probes. The upper blocking distance UB can be entered manually.
Note!
Within the upper and lower blocking distance, a reliable measurement can not be guaranteed.
For stilling well applications
The upper blocking distance (UB) is preset to 100 mm when the "bypass/pipe" parameter has been
selected in the "tank properties" (002) function.
Maximum measured error
Typical statements for reference conditions:
DIN EN 61298-2, percentage of the span.
Output:
sum of non-linearity,
non-repeatability
and hysteresis
Offset / Zero
If the reference conditions are not met, the offset/zero arising from the mounting situation may be
up to ±12 mm. This additional offset/zero can be compensated for by entering a correction
(function "offset" (057)) during commissioning.
LN [m] LN [m]
min max
0,3 4
1 30
digital
measurig range:
– up to 10 m: ±5 mm
– > 10 m: ± 0.05 %
for PA coated rope
measuring range:
– up to 5 m: ±5 mm
– > 5 m: ± 0.1 %
±4 mm
Commissioning
UB [m]
min
1)
0,2
1)
0,2
analogue
± 0.06 %
± 0.03 %
59