17 SuperUser mode
17.5 Upper limit of the sound speed
FLUXUS G809
2020-06-25, UMFLUXUS_G809V2-2EN
152
17.5
Upper limit of the sound speed
When the plausibility of the signal is evaluated, it will be checked whether the sound speed is within a defined range. The
used upper limit of the fluid sound speed is the greatest of the following values:
• fixed upper value, default: 1848 m/s
• value of the sound speed curve of the fluid at the operating point plus offset, default offset: 300 m/s
In the SuperUser mode, the values can be defined for fluids that are not contained in the data set of the transmitter.
• Select
Special Funct.\SYSTEM settings\Measuring\Miscellaneous
.
• Press ENTER until the menu item
Bad soundspeed
is displayed.
• Enter for each measuring channel the fixed upper limit of the sound speed.
• Enter zero to use the default value of 1848 m/s.
• Press ENTER.
• Enter for each measuring channel the offset.
• Enter zero to use the default value of 300 m/s.
• Press ENTER.
It is possible to display the valid range for the sound speed (
SS
) in the lower line within the program branch
Measuring
during the measurement. The second value (here: 2146 m/s) corresponds to the upper limit at the operating point.
Special Funct.\SYSTEM settings\Measuring\Miscellaneous\Bad soundspeed
Special Funct.\SYSTEM settings\Measuring\Miscellaneous\Bad soundspeed\Thresh.
Special Funct.\SYSTEM settings\Measuring\Miscellaneous\Bad soundspeed\Offset
Example
fixed upper value of the sound speed (
Thresh.
): 2007 m/s
Offset
: 600 m/s
value of the sound speed curve at the operating point: 1546 m/s
As 1546 m/s + 600 m/s = 2146 m/s is greater than the fixed upper value 2007, this value will be used as the upper limit
of the sound speed when the plausibility of the signal is evaluated.
Fig. 17.1: Display of the valid sound speed range
Notice!
The defined upper limit of the sound speed remains activated after the deactivation of the SuperUser mode.
GAIN=91dB
SS=1038/2146 m/s
