Flexim FLUXUS WD100, Руководство пользователя

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14 SuperUser Mode FLUXUS WD100, WD200
UMFLUXUS_F5WDV1-1EN, 2016-04-08 71
14.3 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.
14.4 Upper Limit of the Sound Speed
When the plausibility of the signal is evaluated, it will be checked if the sound speed is within a defined range. The upper
limit used for the evaluation is the greater of the following values:
• fixed upper value, default: 1 848 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.
14.5 Detection of Long Measurement Failures
If there are no valid measured value during a long time interval, new increments of the totalizers will be ignored. The val-
ues of the totalizers remain unchanged.
In the SuperUser mode, it is possible to set the time interval. Select
Special Funct.\SYSTEM settings
\
Measur-
ing
\
Miscellaneous
. Press ENTER until the menu item
Do not total. if no meas.
is displayed.
Enter for each measuring channel the max. signal amplification. Enter
0
(zero) if no limit of
the signal amplification is to be used.
Press ENTER.
The current value of the signal amplification (
GAIN=
) can be displayed in the upper line in
the program branch
Measuring
. If the current value of the signal amplification is higher
than the max. signal amplification,
→ FAIL!
will be displayed after the current value.
Attention! The limit of the signal amplification is still active after the deactivation of the SuperUser mode.
Enter for each measuring channel the fixed upper limit of the sound speed. Enter
0
(zero)
to use the default value of 1 848 m/s.
Press ENTER.
Enter for each measuring channel the offset. Enter
0
(zero) to use the default value of
300 m/s.
Press ENTER.
Example: fixed upper value of the sound speed
thresh.
: 2 007 m/s
offset: 600 m/s
value of the sound speed curve at the operating point: 1 546 m/s
As 1 546 m/s + 600 m/s = 2 146 m/s is greater than the fixed upper value 2 007, this value will be
used as the upper limit of the sound speed when the plausibility of the signal is evaluated.
It is possible to display the valid range for the sound speed (
SS=
) in the lower line during
the measurement. The second value (here: 2 146 m/s) is the upper limit at the operating
point.
Attention! The defined upper limit of the sound speed is still active after the deactivation of the SuperUser
mode.
Enter the time. If 0 (zero) is entered, the default value 30 s will be used.
Gain threshold
Fail if > 90 dB
GAIN=91dB → FAIL!
Bad soundspeed
thresh. 2007 m/s
Bad soundspeed
offset: +321 m/s
GAIN=91dB
SS=1038/2146 m/s
Do not total. if
no meas.>
0 s