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
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