Sentec SDM, Service Manual

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4 Troubleshooting
SenTec Digital Monitoring System 49
Problem Possible Cause(s) Recommended corrective action(s)
PO2 Measurement
is influenced by
high ambient light
levels
Shield SenTec TC Sensor from strong
ambient light.
Note: Refer to Status Message ‘High ambient
light’ (with Status Code ‘SA’).
Clean/Inspect the sensor as described in
section 3.1.7 “Cleaning / Inspecting without
Membrane” and perform the ‘Sensitivity Test’
as described in
section 3.1.8 “PCO2 / PO2
Sensitivity & Calibration Duration”.
If problem persists contact SenTec authorized
service personnel.
Significant PCO2
drift
Verify that the sensor is not affected by loose
fit of the membrane, trapped air under the
membrane. If needed perform an
unrequested membrane exchange (activate
the menu “Membrane Change”). After
membrane exchange calibrate the sensor and
allow the PCO2 part of the sensor to stabilize
for 4 hours.
If no remembraning is needed allow the
sensor to stabilize for an additional 2 – 3
hours.
SDM defective Contact SenTec authorized service personnel
or our local SenTec sales representative.
MPB
(Multiparameter-
board, SM1A)
defective
Replace MPB according to the
Repair Manual
for the SDMS.
To be performed by SenTec authorized
service technicians only.
SenTec TC Sensor
defective
Perform the PCO2 Slope Test according to
section 3.1.9 “PCO2 / PO2 Sensitivity &
Calibration Duration”. If the PCO2 slope test
fails replace sensor.
To be performed by SenTec authorized
service technicians only.