Blocking Distance - Endress+Hauser HART Levelflex M FMP41C Brief Operating Instructions

Commissioning
5.5

Blocking distance

Function "upper block. dist" (059)
ENDRESS + HAUSER
– +
E
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" on → ä 37.
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 mm 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.
36
⇒
min
LN [m]
max
1 30
0.3 4
Levelflex M FMP41C 4...20 mA HART
UB [m]
min
0.2
0.2
Endress+Hauser
1)
1)