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4Ć18
800 Series Operator's Manual
D3 Slope Error:
Na
+
pH K
+
Ca
++
Cl
-
Problem
Sensor slope is beyond predefined limits during 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.
Perform a two-point calibration.
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-calibration.
Deproteinize the sample path and condition the sensors 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. The pH, K
+
, Ca
++
, and Cl
–
sensors should be nearly full. The Na
+
sensor should be full. If the solution level is low, refill the sensor as described in
Filling the Measurement Sensors in Section 3.
Check the sensor contacts and measurement block for salt buildup. Check
behind the sensor 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.
Perform the Measurement Test for the affected sensor as described on
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.
D3