9032X
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(“slope”) from a 2-Pt calibration is below 83 or greater than 110. This could be caused
by a number of factors (See next section - Troubleshooting).
NOTE: During single and two point calibrations sample needs to be delivered to analyzer
at flow rate of 150-400ml/min. If not, calibration will result in CF.
4
TROUBLESHOOTING – CALIBRATION FAIL
STRENGTH LESS THAN 83%
Make sure standard containers (CAL1 and CAL2) are full of solution.
Check that vapor bubbles are emerging from the bottom of the stainless steel
entrainment tube.
Check the condition of the reagent solution.
Regenerate the sodium measuring electrode. See Section 5.5.2
If the slope value is not improved after the sodium measuring electrode is
regenerated, the electrode may need to be replaced.
STRENGTH MORE THAN 100%
Possible cause may be faulty reference electrode. Check status of reference
electrode filling solution and add more if using N3010-174.
Check the status of reference electrode and replace if necessary.
Make sure standard containers (CAL1 and CAL2) are full of solution.
VERY LOW OR 0% SLOPE
Check the operation of the solenoid valve(s).
Check flow of standard solution through flow cell.
Check the level of the salt bridge solution in the reference electrode, if using
N3010-174.
Check for open circuit reference electrode by substituting it with an electrode of
known performance.
Make sure standard containers (CAL1 and CAL2) are full of solution.
5
MAINTENANCE
5.1
BUFFER SOLUTION(S)
WARNING!
These buffers are mildly hazardous and should be handled according
to the SDS
Two alternative reagent solutions may be used, depending on the required lower limit
of measurement. Concentrated ammonia solution, which provides adjustment of
sample pH to 10.7 is suitable for measurements of sodium ion to approximately 0.5ppb.
At concentrations below 0.5ppb, hydrogen ion interference becomes significant and a
