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4Ć22
800 Series Operator's Manual
D4 Offset Error:
Na
+
pH K
+
Ca
++
Cl
-
Problem
Sensor offset 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 the D4.
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,
and perform a two-point calibration.
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.
NOTE:ĄĂIf K
+
or Ca
++
have a D4 Offset Error, replace the fill solution even if
the fluid levels are sufficient.
If more than two sensors have the D4 Offset Error, 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.
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.
D4
860850