Sentec SDM, Service Manual

Page: 52 / 93

4 Troubleshooting
HB-005615-j 46
4.2 Troubleshooting List
This section describes problems, possible causes and recommended actions for
troubleshooting.
Note: Shadings in the troubleshooting table reflect different levels of
recommended actions, i.e. for the operator (dark grey), qualified service
personnel (light grey) and SenTec authorized service technicians (no
shading),
see section 4.1 “How to use the troubleshooting list” for details.
4.2.1 Troubleshooting PCO2 / PO2 monitoring
When comparing PCO2/ PO2 values displayed by the SDM with PaCO2/ PaO2 values
obtained from arterial blood gas (ABG) analysis, pay attention to the following
points:

Carefully draw and handle blood samples.

Blood sampling should be performed in steady state conditions.

The PaCO2/ PaO2 value obtained from ABG analysis should be compared to the
SDM’s PCO2/ PO2 reading at the time of blood sampling.

In patients with functional shunts, the sensor application site and the arterial
sampling site should be on the same side of the shunt.

If the menu-parameter ‘Severinghaus Correction Mode’ is set to ‘Auto’, the PCO2
values displayed by the SDM are automatically corrected to 37 °C (regardless of
the patient’s core temperature). When performing the ABG analysis, be sure to
properly enter the patient’s core temperature into the blood gas analyzer. Use
the blood gas analyzer’s ‘37°C-PaCO2’ value to compare with the SDM’s PCO2
value.

Verify proper operation of the blood gas analyzer. Periodically compare the blood
gas analyzer’s barometric pressure against a known calibrated reference
barometer.
Note: This section only is applicable for SenTec TC Sensors with PCO2 and/ or PO2
enabled.