dynasonics TFXL series User Manual

Rev. 01/11 -3.8- TFXL-X
Flow Filter Hysteresis entry), this adaptive filter will increase
the number of successive flow readings that are averaged
together up to this maximum value. If flow changes outside of
the Flow Filter Hysteresis window, the Flow Filter adapts by
decreasing and allows the meter to react faster. Increasing this
value tends to provide smoother steady-state flow readings and
outputs.
 Flow Filter Hysteresis creates a window around the average
flow measurement reading; whereby if the flow varies within that
window, greater Flow Filter Damping will occur. The filter also
establishes a flow rate window where measurements outside of
the window are captured by the Bad Data Rejection Filter. The
value is entered as a percentage of actual flow rate.
Example:
If the average flow rate is 100 GPM and the Flow Filter
Hysteresis is set to 5%, a filter window of 95-105 GPM is
established. Successive flow measurements that are
measured within that window are recorded and averaged in
accordance with the Flow Filter Damping setting. Flow
readings outside of the window are held up in accordance
with the Bad Data Rejection Filter.
 Flow Filter MinHysteresis sets a minimum hysteresis window
that is invoked at low flow rates, where the “of rate” Flow Filter
Hysteresis is very small and ineffective. This entry is entered in
picoseconds and is differential time. This value is factory set and
should not be altered without consulting the Dynasonics
technical services department.
 Flow Filter Sensitivity allows configuration of how fast the Flow
Filter Damping will adapt in the positive
direction. Increasing
this value allows greater damping to occur faster than lower
values. Adaptation in the negative direction is not user
adjustable.
 Bad Data Rejection is a value related to the number of
successive readings that must be measured outside of the Flow
Filter Hysteresis and Flow Filter MinHysteresis windows
before the flow meter will use that flow value. Larger values are
entered into the Bad Data Rejection when measuring liquids that
contain gas bubbles, as the gas bubbles tend to disturb the
ultrasonic signals and cause more extraneous flow readings to
occur. Larger Bad Data Rejection values tend to make the flow
meter more sluggish to rapid changes in actual flow rate.
PART 3 - PROGRAMMING

dynasonics TFXL series Specifications

General

Brand	dynasonics
Model	TFXL series
Category	Measuring Instruments
Language	English