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Problem Probable Cause and Solutions
Salt deposits appear
in measurement
module
1. Check the reference sensor for leaks. Tighten cap if
required and clean any deposits with a swab moistened in
reagent water.
2. Clean deposits in measurement module and on all sensors
with swabs moistened in reagent water.
3. Verify that all sensor O-rings and sensors are correctly
aligned with the sample path and that the O-rings are not
deteriorated.
NOTE: The reference sensor has two O-rings.
Fluid in sensor too
low
Refill the sensor. Refer to the appropriate procedure in
Section 3.
More than two
sensors have a D4
Offset Error
1. If the pH or ISE sensors show offset errors, check the
reference sensor for the correct solution level, salt in the
vent hole, bubbles in the sensor, or leaks.
2. If the gas sensors show offset errors, check the gas
supplies.
3. For a K
+
or Ca
++
sensor, replace the fill solution even if it
is sufficient.
Sensor fails the
measurement test
An open circuit sensor contact or an electronic failure has
occurred, or a fluid leaked into the preamplifier assembly.
1. Ensure that the sensor is installed correctly.
2. Wipe the contact on the sensor with a clean lint-free tissue.
3. Replace the sensor.