FDT-25W Wall Mounter Ultrasonic Flowmeter
18
regarded as empty pipe, and the flow meter will not totalize flow.
This is based on the fact that, for most occasions, when pipe is empty, the transducer would
still receive signal, just smaller than normal, As a result, The flow meter would show normal
operation, which is not correct.
Make sure that the entered value must be less than the normal signal strength.
When much noisy signals are received, to make sure the flow meter will not incorrectly totalize
flow, there is also a ‘Q’ threshold should be entered in M.5
M30
Window for selecting unit system. The conversion English to Metric or vice versa will not affect
the unit for totalizers.
M31
Window for selecting flow rate unit system.
Flow rate can be in
0. Cubic meter
short for
(m
3
)
1. Liter
(l)
2. USA gallon
(gal)
3. Imperial Gallon
(igl)
4. Million USA gallon
(mgl)
5. Cubic feet
(cf)
6. USA liquid barrel
(bal)
7. Oil barrel
(ob)
The flow unit in terms of time can be per day, per hour, per minute or per second. So there are
32 different flow rate units in total for selection.
M32
Window for selecting the totalizers unit. Available units are the same as those in M31
M33
Window for setting the totalizer multiplying factor
The multiplying factor ranges from 0.001 to 10000. Factory default is 1
M34
Turn on or turn off the NET totalizer
M35
Turn on or turn off the POS (positive) totalizer
M36
Turn on or turn off the NEG(negative) totalizer
M37
(1) Totalizer reset
(2) Restore the factory default settings parameters. Press the dot key followed by the
backspace key. Attention, It is recommended to make note on the parameters before doing the
restoration
M38
Manual totalizer used for easier calibration. Press a key to start and press a key to stop the
manual totalizer.
M39
Interface Language selection.
The selection could also be changed automatically by the system, if English LCD display is
used as the display device.
M3.
Setup for local segmental LCD display. Enter 0 or 1 for the non-auto-scan mode; Enter 2~39 for
the auto-scan mode. In the auto-scan mode the display will automatically scan displaying from
00 to the entered number of the local segmental LCD display.
M40
Flow rate damper for a stable value. The damping parameter ranges form 0 to 999 seconds.
0 means there is no damping. Factory default is 10 seconds
M41
Low flow rate (or zero flow rate) cut-off to avoid invalid accumulation.
M42
Zero calibration/Zero point setup. Make sure the liquid in the pipe is not running while doing the
setup.
M43
Clear the zero point value, and restore the solidified zero point value.
M44
Set up a flow bias. Generally this value should be 0.