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P06:
Far end blocking
Far end blocking is used to neglect incorrect
level/volume readings and output actions below a
pre-set level programmed in P06.
A). Level measurement
The far-end blocking can be used to avoid disturbing
effect of stirrer or heaters at the bottom of the tanks.
If the level of the medium sinks below the
blocked out range:
-
”Sub 0”
will be indicated for the level and volume
- Distance value is not interpretable
- Current output will hold the value corresponding to
the far end blocking level
If the medium level is above the blocked out range:
The calculation of level and volume will be based on the programmed tank dimensions, therefore the measured or calculated process values
will not be influenced in any way, by the far end blocking value.
B). Open channel flow metering
Far end blocking will be used for those small levels below which the accurate volume flow calculation is no longer possible.
If the liquid level in the flume/weir falls below the blocked out range:
The DMSP400 and DMSP500 will act as follows:
-
Indicate ”
No Flow
” on the Display
- Hold last valid data on the current output.
If the level in the flume/weir is above the blocked out range:
The calculation of volume flow will be based on the programmed flume/weir data; therefore the measurement values will not be influenced in any
way, by the far end blocking value.
FACTORY DEFAULT: 0
