Ultraflux Minisonic 2000, User Manual, Page: 24 / 27

NT217 C GB1 24 / 27
> Case 2 : In addition to the points mentioned above, the possible causes are:

Poor control of the installed dimensions, or of the product characterization or of the
Zero point:
Correct and reanalyse

An installation constructed with poor hydraulic conditions:
If possible, change the location of the probes.
Otherwise, it is possible to choose KHydro = Manual and adjust this coefficient to
display the expected flow value: Increasing it does flow value decrease.
With insertion probes, it is also possible to play on Axial D.

The range of speed of sound to be measured is too wide for the chosen setup:
With S.E. probes, a direct mode ( / ) may be preferable to a reflex mode ( V )
Have you correctly set Co and Delta C range) ?

An unstable fluid causing the ESC mode to restart too often:
Try the AUTO mode with a reduced margin (
∼
12 dB or less)

To permit a greater precision or a wider flow range, the MiniSonic allows the input of
a “Linearization” correction law.

Plot the error curve and use the software to enter the complementary law (Factory
Adjustments Menu) .

The Delta t offered by the measurement conditions (Diameter, Flow Rate, Assembly,
Choice of probes) is too low to claim any measurement accuracy.
Is it possible to revise these choices?

The measurement conditions reveal poor control of transitions from turbulent to
laminar configurations:
Adapt declared Critical Reynolds and range (LBR) values or play with Kh=manual.
> Case 3 : The MiniSonic does not operate:

There is no display or measurement transmission (4
– 20 mA) .
Is the MiniSonic powered up? Check with a Voltmeter.
Has it failed? If yes, the only solution is to call in our after-sales service.

If the MiniSonic displays INIT constantly, attempt a power cutoff, then re-energize
Would the MiniSonic supplied by a too low voltage or power source?
If the fault persists, contact Ultraflux (Problem with the microprocessor).

If the MiniSonic displays “Flow Rate Fault”, this message does not mean that the
MiniSonic has failed, but that the ultrasound signals have not reached the expected
level or are outside the window [Co +/- Delta C]. There are several possibilities:
Is pipe full or partially empty?
Is there a problem of site?
Two-phase fluid or that is too highly charged or too viscous?
Old pipe and / or pipe wall not transmitting ultrasonic signals?
Is installation mode choice adapted to site? Try direct mode (\) or other sensors.
Incorrect sensor installation (orientation, coupling …).