Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 52)

Rev. 8/02
-3. 14- TFXM
filter software settings and as a baseline for the FL C-OFF
entry below.
FL C-OFF - Low Flow Cut-off
Percent of MAX RATE
A Low Flow Cut-off entry is provided to allow very low flow
rates (that can be present when pumps are off and valves are
closed) to be displayed as Zero flow. Typical values that
should be entered are between 1.0% and 5.0% of full-scale.
DAMP PER - System Damping
Relative Percent Entry
DAMP PER establishes a maximum adaptive filter value.
Under stable flow conditions (flow that varies less than the
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 (typically ±5% of flow rate),
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. The DAMP PER
setting increases and decreases the response time of the flow
meter display and outputs. Enter a value between 1 and 100
percent, a setting of 1 having the fastest response and 100
having the slowest response.
PART 3 - KEYPAD CONFIGURATION
Flow Reading
Damping
NOTE: The Maximum Rate may be set anywhere in the flow
measurement range of -40 to +40 FPS. For example: If bi-
directional flow needs to be logged, set the MIN RATE at a
negative value and MAX RATE at a positive value.
Low Flow
Cut-off