Covidien INVOS 5100C - Table 9-5. Signal Strength Indicator Troubleshooting Chart

Maintenance
9-10 Operator's Manual
and an alarm message and help notes are displayed (see section 6.5.13 Alarms and Status Messag-
es).
Table9-5.provides SSI ranges and a list of the possible causes and action to correct for each, if
necessary.
Table9-5.Signal Strength Indicator Troubleshooting Chart
SSI indication Description/cause Action
5 bars
STATUS CODE: 4
Full strength signal No action required.
1 through 4 bars—stable Signal is weaker, but is strong and stable
enough to generate an accurate rSO
2
value
No action required.
1 through 4 bars—fluctuating
and unstable
Signal is weak and unstable
Signal interference Identify any possible sources of interfer-
ence, such as electrocautery or similar elec-
trical equipment interferences, intense
light or radiation sources, moving artifacts
or perturbations on the mains.
Sensor application over nevi, sinus cavities,
the superior sagittal sinus, subdural or epi-
dural hematomas or other anomalies such
as arteriovenous malformations, broken
skin, thick fatty deposits, hair or bony pro-
tuberances, or area contaminated with
residue
Clean the area, reapply the sensor to the
patient in an adjacent area; follow the
sensor application instructions and make
sure no hair, anomalies, or residues are
under the sensor.
Defective sensor Apply a new sensor to the patient.
Moisture in sensor connection Dry the cable and sensor connectors. Make
sure the connection is not exposed to
moisture.
0 bar See error messages in data channel area on
screen (see Table6-6.)
Follow on-screen instructions.