FPMAN-1-190214
Page 11
When finished, keep holding the
SET
button down
until “SAVED” is displayed, then release the
SET
button.
FLOW LO
: Low set point for flow alarm.
Range is 0 to FLOW HI – 2% FS. If set to 0, alarm is
disabled. Alarm hysteresis is 1% FS.
Use
SET
,
UP
,
DOWN
buttons as explained above to
change the set point.
OUTPUT SPAN
: Scale the 4-20mA output
Range is 50% to 120% of factory calibration. For
example, if the flowmeter was originally ordered for
360 SCFH (20 mA=360 SCFH), you can scale the
output to read 20 mA as low as 180 SCFH or as high
as 420 SCFH for ease of measurement at user-specific
flows.
THRESH
: Threshold percentage for filtering noisy flow readings.
Use
SET
,
UP
,
DOWN
buttons as explained above
to change the set point.
The filtering algorithm can detect outlier
s
and
exclude them from signal averaging. The Threshold
value (in percent) determines which samples will be left out. Percentage is with respect
to the internal moving average. Range is 3-50%. For example, when Threshold is set to
20%, if the moving average is 100 SCFH and a single flow sample is either above 120
SCFH or below 80 SCFH (i.e. 20% of the average), it will be ignored and not added to
the moving average
.
However, if subsequent samples are all outside the
threshold
band,
then they will be counted in and the moving average is updated with the new values
(more than one sample signifies a real change in flow, not noise).
Содержание FlowStream FP Series
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Страница 17: ...FPMAN 1 190214 Page 17 DIMENSIONS ...