NuFlo MC-II Plus Panel Mount, Руководство пользователя

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MC-II Plus WP-PM Flow Analyzer
May 2005 23
Setting Flow Rate Filter
The flow rate filter smoothes out sudden changes in the rate indication and 4-20 mA
rate output due to variations in flow meter frequency. In all cases, the display will still
update once per second.
Although the 4-20mA rate output function is not applicable to the MC-II
Plus Portable
Rate Meter, the user can achieve a smoother display of rate data by setting the flow
rate filter.
The degree of filtering is set by accessing the
rAtE.dLY selection in the calibration
menu. It is located just after the rAtE.EnG selection.
From the
rAtE.dLY selection, you may choose any of four filter settings, as
described below.
Display Setting
nonE Filter disabled – factory default setting
5
Time equal to 5 rate samples to reach 90% of final value
10 Time equal to 10 rate samples to reach 90% of final value
20 Time equal to 20 rate samples to reach 90% of final value
The
nonE setting disables the filter. At this setting, the calculated flow rate tracks the
input frequency so any variation in the meter frequency will produce the correspond-
ing variation in the rate indication and 4-20 mA rate output.
Each subsequent setting of
5, 10 and 20 will dampen the signal, resulting in an
increasingly smooth display of changes in the meter frequency.
The steps required to change flow rate filtering on a calibrated unit are:
1. Enter the Calibrate Mode by pressing the ACCESS key.
2. Accept the current settings by pressing ENTER until the rAtE.dLY prompt is
displayed.
3. Press INCR or STEP until the desired flow rate filter is shown on the lower line
of the display. Press ENTER .
4. At this point, the flow rate filtering has been configured. Pressing ACCESS exits
the Calibrate Mode without making any further changes, or the remaining steps
may be implemented.
Setting Input Sensitivity
The input sensitivity of the MC-II
Plus Flow Analyzer is measured in millivolts (mV)
peak-to-peak. This is the threshold value at which the circuitry responds to a signal.