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14 User modes

14.2 ExpertUser mode PIOX S72*

2022-05-15, UMPIOX_S72xV1-9EN

142

• Enter the value for the relative threshold for the particular measuring channel.

• Press ENTER.

14.2.4 Profile correction

It is possible to select the following versions for the calculation of the fluid mechanic calibration factor k

• kRe 1.0: profile correction (previous version)

• kRe 2.0: improved profile correction (current version, default)

• kRe 2.0 disturb. corr.: improved profile correction at non ideal inflow conditions for the positive flow direction

(negative flow direction without disturbance correction)

• kRe 2.0 dist.corr.bidir.: improved profile correction at non ideal inflow conditions for the positive and negative

flow direction (automatic toggling of the profile correction depending on the flow direction)

The following steps are necessary to set the profile correction:

• selection of the profile correction version for all measuring channels in the program branch Special functions.

• selection of the disturbance type in the program branch Parameters

• input of the disturbance distance in the program branch Parameters if kRe 2.0 disturb. corr. or kRe 2.0

dist.corr.bidir. has been selected

Selection of the version

• Select the menu item Measurement settings in the program branch Special functions.

• Press ENTER until the menu item Profile correction is displayed.

• Select a list item (default: kRe 2.0).

• Press ENTER.

Selection of the disturbance

• Select a list item.

• Press ENTER.

If kRe 2.0 disturb. corr. or kRe 2.0 dist.corr.bidir. is selected, the disturbance parameters have to be

entered.

Options\Special settings\Relative threshold

Example

absolute threshold: 2007 m/s

relative threshold: 600 m/s

value of the sound speed curve at the measuring point: 1546 m/s

As 1546 m/s + 600 m/s = 2146 m/s is greater than the absolute value 2007 m/s, this value will be used as the absolute

limit of the sound speed when the plausibility of the signal is evaluated.

Notice!

If kRe 2.0 disturb. corr. or kRe 2.0 dist.corr.bidir. has been selected, the transducers have to be

mounted in reflection arrangement, X arrangement or displaced X arrangement to compensate cross-flow effects.

Special functions\Measurement\Measurement settings\Profile correction

Parameters\Disturbance type

Flexim PIOX S72 Series User Manual

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