Product Description
FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG 43
Subject to change without notice
Table 9 Path warnings in the User Warnings
Monitored
measurement
Configurable User
Warning
Parameters
Default
value
Notes
Default
activation
state
1
Turbulence
2
Variance of the
average path
velocity
Path turbulence 6%
A change in the path turbulence indicates changed flow
conditions (e.g. a blocked flow conditioner). If the current
turbulence value of any path exceeds the value "Path
turbulence", a User Warning is generated.
Off
Signal-to-noise
ratio (SNR)
SNR limit 13 dB
Interfering noise caused by fittings in the pipeline, valves
that are not fully open, sources of noise near the
measuring location, or defective ultrasonic transducers
may affect the signal-to-noise-ratio. If the signal-to-noise
ratio drops below the limit specified in "SNR limit", a User
Warning is generated.
On
Signal
amplification
AGC limit 93 dB
If the absolute value of the signal amplification exceeds
the limit specified as "AGC limit", a User Warning is
generated.
On
AGC deviation 10 dB
The absolute difference between both path gain factors is
monitored. If the AGCs of a path deviate more than
permitted, this can indicate a malfunction in the
ultrasonic transducers, electronic modules, transducer
cables or parameter settings (signal models, control
limits). If the value specified for the parameter "AGC
deviation" is exceeded by a path, a User Warning is
generated.
On
Speed of
sound (SOS)
2
SOS deviation 0.2%
The deviation between the current measured path SOS
and the average value of the mean SOS calculated for all
paths is monitored. The current gas velocity is used as a
weighting factor, so that temperature stratification is
disregarded at very low flow velocities. The SOS deviation
indicates whether or not a path is measuring the correct
transit time.
If the SOS deviation of any path exceeds the value
specified for the parameter "SOS deviation", a User
Warning will be generated.
On
Performance
Performance
limit
75%
The quality of the received signals is continuously
monitored. If it drops below the limit specified in
"Performance limit", a User Warning is generated.
Off
1
User Warnings must be activated to become effective on the warning output.
2
These User Warning limits are only monitored, as long as certain preconditions are met. The VOG must be above the value set in "Min. VOG for warnings"
and the SOS must be relatively stable (change in %/s must be below the value set in "SOS profile rising").
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