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Problem Probable Cause and Solutions
During the first 24 hours
following installation, the
glucose or lactate biosensors
measure a large negative
slope value during
calibration. The biosensors
measure an equal, but
positive slope valve during
the next calibration.
The shift in slope value is due to bubbles trapped in the
glucose or lactate biosensor.
Analyze several blood samples sequentially.
NOTE: The problem may clear itself if no blood
samples are analyzed for 12 – 24 hours.
Erratic sample flow The fluid flow is insufficient due to clots in the sample
or to obstructions in the sample path.
1. Check your sampling technique as described in
Sample Collection Devices and Anticoagulants in
Section 1.
2. Check for obstructions in the sample entry
components as described in Removing Obstructions
from the Sample Entry Components, page 4-79
.
3. Check for obstructions in the measurement module
as described in Removing Obstructions from the
Measurement Module, page 4-82.
4. Check for obstructions in the CO-ox module as
described in Removing Obstructions from the
CO-ox Sample Path, page 4-87.
5. Verify that all sensor O-rings and sensors are
correctly aligned with the sample path and that the
O-rings are not deteriorated.
NOTE: The reference sensor has two O-rings.
6. Verify that the hemolyzer gasket on the CO-ox
module is seated correctly.
7. Verify that the sample chamber gasket on the
CO-ox module is seated correctly.
8. Test the sample pump flow rate as described in
Pump Functions Test, page 4-58, and verify that the
pump is operating correctly.