Noise Filter (Filter); Noise Filter Bypass (Bypass); Rounding Feature (Round) - FlowLine DataView LI55 Instruction Manual

DataView™ LI55 Level Controller
Noise Filter ( filtEr )
The noise filter is available for unusually noisy signals that cause an unstable
process variable display. The noise filter averages the input signal over a certain
period. The filter level determines the length of time over which the signal is
averaged. The filter level can be set between 2 and 199. The higher the filter
level, the longer the averaging time and so the longer it takes the display to settle
to its final value. Setting the filter level to zero disables the filter function.
Noise Filter Bypass ( bypAss )
The noise filter bypass changes the behavior of the meter so that small variations
in the signal are filtered out but large abrupt changes in the input signal are
displayed immediately. The bypass value determines the minimum amount of
signal change to be displayed immediately. All signal changes smaller than the
bypass value are filtered or averaged by the meter. The noise filter bypass may
be set between 0.1 and 99.9% of full scale.
Rounding Feature ( round )
The rounding feature is used to give the user a steadier display with fluctuating
signals. Rounding is used in addition to the filter function.
Rounding causes the display to round to the nearest value according the
rounding selected. See examples below:
Rounding Actual
Selection Value
1 12.022
5 12.022
10 12.024
MN301033 Rev B1
Display Actual
Value Value
12.022 12.023
12.020 12.023
12.020 12.025
Instruction Manual
Display
Value
12.023
12.025
12.030
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