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
Re
:
•
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
