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4Ć12
800 Series Operator's Manual
D2 Excessive Drift:
pO
2
pCO
2
Problem
Sensor drift is beyond predefined limits during a one-point or a two-point calibration.
Qualifiers: pO
2
pCO
2
Solutions
NOTE:ĄĂIf D codes also exist for reagent problems such as D23, D24, or D29,
correct these problems first, then correct this D code.
If a D2 for pCO
2
, with a drift greater than 4.0 mmHg, occurs twice in a 4-hour
period and no drift occurs for pO
2
, perform QC analysis. If the pCO
2
result is
out of range, replace the sensor.
Ensure that the gas tank pressures are greater than 300 psi. Ensure that the Cal
Gas and Slope Gas tanks are connected to the correct gas fittings. Ensure that
all connections are tight. If the pressure is too low, replace the affected gas
tanks as described in Replacing the Gas Tanks in Section 3.
Deproteinize the sample path as described in Deproteinizing the Sample Path in
Section 3.
Check for cracks or leaks in the sample tubing. If necessary, replace the sample
tubing as described in Replacing the Sample Tubing in Section 3.
Check for leaks or crimps in the gas tubing. If necessary, replace the gas tubing
as described in Replacing the Gas Tubing in Section 3.
Check the gas flow rate and valve operation for Cal Gas and Slope Gas as
described on page 4-64. Perform the Valves Test as described on page 4-62.
Check that the sensors are installed in the correct order and are aligned, the
O-rings are in place, and the spring-loaded latch is closed. Remove and install
the sensors correctly if necessary, as described in Removing and Checking the
Sensors on page 4-65.
Perform the Measurement test for the affected sensor as described in
Measurement Test, page 4-70.
Replace the affected sensor as described in Replacing the Measurement or
Sample Ground/ Temperature Sensors in Section 3.
If the D code reappears, contact your Service Representative.
D2