SICK FLOWSIC600 - Page 193

Troubleshooting
FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG 193
Subject to change without notice
Interpretation of active User Warning status (continued)
Yellow light
for...
Possible causes Actions
Battery
lifespan
(change
battery)
The remaining battery lifespan is less than 15%
 Check when the battery was last replaced.
Replace battery within one year (battery age
is 8.5 years)
Path
turbulence
1
A change in the path turbulence indicates
changed flow conditions (e.g. a blocked flow
conditioner).
 Compare the current value with previous
measurements (e.g. Maintenance Report
from commissioning) and compare the
conditions.
 Check whether the User Warning limit is
configured correctly (
 pg. 149, 5.7.1).
 Create a Diagnosis Session according to
 pg. 198, 7.3 and contact your trained staff.
SNR limit
(Signal-to-
noise ratio)
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. Other possible sources of
interference include electrical noise caused by
bad contact of the connectors or sources of
acoustic interference, such as control valves or
very high flow velocities.
These values are generally site-specific and do
not change as long as the conditions remain the
same. A reduction in the signal-to-noise ratio
while the AGC level stays unchanged, hints at
sources of acoustic interference (e.g. pressure
regulator) near the point of measurement.
 Compare the current value with previous
measurements (e.g. Maintenance Report
from commissioning) and check whether the
User Warning limit is configured correctly
(
 pg. 149, 5.7.1).
 Check the AGC level.
 Create a Diagnosis Session according to
 pg. 198, 7.3 and contact your trained staff.
AGC limit
(signal
amplification)
The signal amplification (AGC level) set by the
meter largely depends on the current process
pressure. The reception sensitivity is inversely
proportional to the process pressure: if the
pressure doubles, the sensitivity will be 6dB
smaller.
Under normal conditions, this value is very
stable over time. Significant fluctuations in the
AGC level indicate a low-quality received signal.
A significant increase under comparable process
conditions is usually caused by dirt on the
ultrasonic transducers.
 Compare the current value with previous
measurements (e.g. Maintenance Report
from commissioning) and check whether the
User Warning limit is configured correctly
(
 pg. 149, 5.7.1).
 Create a Diagnosis Session according to
 pg. 198, 7.3 and contact your trained staff.
1
These User Warning limits are only monitored, as long as certain preconditions are met (  pg. 154, Table 22).