PD6928 Ex-Proof & I.S. Loop-Powered Flow Rate/Totalizer
Instruction Manual
63
Low-Flow Cutoff (
CUTOFF
)
The low-flow cutoff feature allows the meter to be programmed so that the often-unsteady output from a differential
pressure transmitter at low flow rates always displays zero on the meter. The cutoff value may be programmed from
0.1 to 99999. The meter will display zero below the cutoff value. The cutoff can be disabled to display negative
values.
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 of time. The filter level determines the length of time over which
the signal is averaged. The filter level can be set between 1 and 16 seconds or turned off. 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
off disables the filter function.
Noise Filter Bypass (
BYPAS
)
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.
