17 SuperUser mode
FLUXUS G809
17.4 Limit of the signal amplification
151
UMFLUXUS_G809V2-2EN, 2020-06-25
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!
.
Example
Slope
: 1.1
Offset
: -10.0 cm/s = -0.1 m/s
If a flow velocity v = 5 m/s is measured, before the calculation of the derived quantities, it will be corrected as follows:
v
cor
= 1.1 · 5 m/s - 0.1 m/s = 5.4 m/s
Example
Slope
: -1.0
Offset
: 0.0
Only the sign of the measured values changes.
Notice!
The correction data will only be stored when a measurement is started. If the transmitter is switched off without start
-
ing a measurement, the entered correction data will be lost.
Notice!
The correction of the flow velocity is still activated after the deactivation of the SuperUser mode.
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.
