Endress+Hauser Levelflex FMP53 - Operational safety

Levelflex FMP53
10 Endress+Hauser
Blocking distance
The upper blocking distance (= UB) is the minimum distance from the reference point of the
measurement (mounting flange) to the maximum level.
F
UB
E
100%
0%
LN
R
SD
A0011279
 3 Definition of blocking distance and safety distance
R Reference point of measurement
LN Probe length
UB Upper blocking distance
E Empty calibration (= zero)
F Full calibration (= span)
SD Safety distance
Blocking distance (factory setting):
For rod probes up to 6 m (20 ft): 200 mm (8 in)
The specified blocking distances are factory-preset on delivery. These settings can be changed
depending on the application.
If a spray head is used, the blocking distance may not be set to less than 50 mm (2 in),
however.
For rod probes, the blocking distance can generally be reduced to 100 mm (4 in) for media with
DC > 7.
No blocking distance applies for applications in a bypass/stilling well.
A reliable measurement cannot be guaranteed within the blocking distance.
A safety distance SD can be defined in addition to the blocking distance. The device generates a
warning if the level rises to enter this safety distance.
Measuring frequency
spectrum
100 MHz to 1.5 GHz