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4Ć13
Troubleshooting the System
D2 Excessive Drift:
Na
+
pH K
+
Ca
++
Cl
-
Problem
Sensor drift is beyond predefined limits during a one-point or a two-point calibration.
Qualifiers: pH K
+
Ca
++
Cl
–
Na
+
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 more than one sensor has excessive drift, check the reference sensor for KCl
leaks as described in Cleaning the Reference Sensor and Removing Bubbles in
Section 3.
Check the expiration dates and the levels of the reagents. Ensure that the
reagent bottles are installed properly and in the correct location. If reagents
have expired, are low, or are incorrectly installed, replace the affected reagents,
prime the system, and perform a two-point calibration.
Deproteinize and condition as described in Deproteinizing the Sample Path and
Conditioning the Sensors in Section 3.
Check the solution level in the affected measurement sensor and look for
bubbles. If the solution level is low, refill the sensor as described in Filling the
Measurement Sensors in Section 3.
Check the solution level in the reference sensor and look for salt in the vent
hole, bubbles in the sensor, or leaks. If the solution level is low or salt, bubbles,
or leaks are present, clean and refill the reference sensor as described in
Cleaning the Reference Sensor and Removing Bubbles and Filling the Reference
Sensor in Section 3.
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 as described in
Removing and Checking the Sensors on page 4-65.
Check the sensor contacts and measurement block for salt buildup. Check
behind the sensors for fluid leaks that can come from the reference sensor. If
salt or leaks are present, clean the sensor with reagent water, dry, and perform a
two-point calibration after reinstalling the sensor.
D2