Endress+Hauser Levelflex FMP53 HART Operating Instructions Manual page 144

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due to a level change during operation. Signals which are already in the blocking distance
when the device is switched on, are ignored.
This behavior is only valid if the following two conditions are met:
• Expert → Sensor → Echo tracking → Evaluation mode = Short time history or Long
time history)
• Expert → Sensor → Gas phase compensation → GPC mode= On, Without correction
or External correction
If one of these conditions is not met, signals in the blocking distance will always be
ignored.
A different behavior for signals in the blocking distance can be defined in the
Blocking distance evaluation mode parameter.
If required, a different behavior for signals in the blocking distance can be defined by
the Endress+Hauser service.
 33 Blocking distance (UB) for liquid measurements
UB
Levelflex FMP53 HART
A0013219
Endress+Hauser