D2 Excessive Drift: Na + K + Ca ++ Cl - Siemens Rapidlab 1200 Operator's Manual

Rapidlab 1200 Operator's Guide: Troubleshooting
D2 Excessive Drift: Na
Problem
Sensor drift is
beyond predefined
limits during
calibration
operations.
+ + ++
K Ca Cl¯
Corrective Action
Correct any reagent problems such as D23 codes before you
attempt to correct this D code.
• If the sensor was newly installed or if maintenance was
recently performed, allow sufficient time for the sensor to
equilibrate.
• Perform additional calibrations.
• If more than one sensor has excessive drift, check the
reference sensor for KCl leaks.
• Deproteinize the sample path.
Refer to Deproteinizing the Sample Path‚ page 5-4.
• If both the pH and Na
sensors.
Refer to Conditioning the Sensors‚ page 5-6.
• Check the solution level in the affected sensor and look for
bubbles.
+ ++
The K , Ca , and Cl¯ sensors should be nearly full. The
+
pH and Na sensors should be full. If the solution level is
low, refill the sensor.
• If more than one sensor has drift, check the solution level in
the reference sensor and look for salt in the vent hole and
bubbles in the sensor.
• Clean and refill the reference sensor as needed, or replace
it.
• Check that the sensors are installed in the correct location
and are aligned, the O-rings are in place, and the
spring-loaded latch is closed.
If necessary, remove and install the sensors correctly.
• 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 water, dry, reinstall and perform a 2-point
calibration. Refer to Performing Manual Calibrations‚
page 3-4.
• If the problem persists, replace the sensor.
• If the problem persists, call for technical assistance.
+
sensors have drift, condition the
02087462 Rev. V
6-49