17 SuperUser mode
17.4 Limit of the signal amplification
FLUXUS F808
2020-06-25, UMFLUXUS_F808V2-2EN
144
17.4
Limit of the signal amplification
In order to prevent disturbing and/or pipe wall signals (e.g., if the pipe has run empty) from being interpreted as useful sig
-
nals, it is possible to define a max. signal amplification. If the signal amplification is greater than the max. signal amplifica
-
tion,
• the flow velocity will be marked as invalid. The physical quantity cannot be determined.
• a hash symbol (
#
) will be displayed after the unit of measurement (in case of a normal error, (
?
) is displayed).
• Select
Special Funct.\SYSTEM settings\Measuring\Miscellaneous
.
• Press ENTER until the menu item
Gain threshold
is displayed.
• Enter for each measuring channel the max. signal amplification.
• Enter zero to measure without a limit of the signal amplification.
• Press ENTER.
The current value of the amplification (
GAIN
) can be displayed in the upper line in the program branch
Measuring
. If the
current value of the amplification is higher than the max. amplification, the current value is displayed with
→FAIL!
.
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.
Special Funct.\SYSTEM settings\Measuring\Miscellaneous\Gain threshold
Special Funct.\SYSTEM settings\Measuring\Miscellaneous\Gain threshold\Fail if > 90 dB
Notice!
The limit of the signal amplification is still activated after the deactivation of the SuperUser mode.
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