FlowCERT

P876 Rate Distance
This parameter is the rate Measurement Units (P104) over which the
material level must change before the Rate Value (P877) is updated. If the
Rate Time (P875) expires before the Rate Distance (P876) is exceeded
then the Rate Value (P877) will be updated immediately. Default = 0.05m
P877 Rate Value
This parameter displays the current rate of change of material level, in
Measurement Units (P104) per minute. It is read only.
P878 Lower Cutoff
This parameter is used to select the minimum Rate to be calculated, and can
be used to eliminate unwanted updates from effects of ripples/waves on the
surface of the material.
Filters
The following three parameters can be used to filter out unwanted changes
of level caused by a ‘rippled’ or agitated surface.
P880 Gate Mode
This parameter determines the operation of the gate, which is established
around the processed echo and is used to track the echoes movement and
update the display. If set to Fixed, P880 = 0 (Default) then the width of the
gate is determined by the value of P881 Fixed Distance. When set to
Calculated, P880=1 then the gate width is automatically calculated and
updated according to the values of P870, P871, P874, P875 and P876.
P881 Fixed Distance
This parameter determines the width of gate to be used in tracking an echo
and under normal circumstances will not require changing, but it can be
increased in the cases where the surface is moving extremely fast (in excess
of 10m/min) to ensure smooth processing of the changing level.
P882 Process Filter
This parameter determines the number of ‘cycles’ that will be taken before a
change in level is processed and the display updated.
Option
Description
1 = Fast level will be updated every cycle
2 = Medium level will be updated every 8 cycles
3 = Slow (Default) level will be updated every 16 cycles
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