Problem Possible cause Solution
The instrument
reading is high.
There is a leak in one of the reagent
delivery valves.
Complete the diagnostic test for reagent delivery
valves. Refer to Diagnostic test for reagent delivery
valves on page 11. If a leak is found, replace the
applicable reagent delivery valve.
The quantity of reagent that is supplied
to the sample cell is incorrect.
Complete the diagnostic test for reagent delivery.
Refer to Diagnostic test for reagent delivery
on page 11. If the reagent delivery is incorrect,
look for a blockage in the tubing or replace the
applicable solenoid valve.
The reagent blank value in the
REAGENTS/STANDARDS menu is
different from the value on the
R1 (molybdate reagent) bottle.
Change the reagent blank value in the
REAGENTS/STANDARDS menu to show the value
that is on the R1 reagent bottle.
There is a blue stain on the sample cell. Replace the sample cell. Use the reagent set with
the modified R2 (citric acid) reagent.
The instrument
readings are not
stable.
There is a leak in one of the reagent
delivery valves.
Complete the diagnostic test for reagent delivery
valves. Refer to Diagnostic test for reagent delivery
valves on page 11. If a leak is found, replace the
applicable reagent delivery valve.
The quantity of reagent that is supplied
to the sample cell is incorrect.
Complete the diagnostic test for reagent delivery.
Refer to Diagnostic test for reagent delivery
on page 11. If the reagent delivery is incorrect,
look for a blockage in the tubing or replace the
applicable solenoid valve.
There are bubbles in the sample cell. Look for bubbles in the sample cell. If there are
bubbles in the sample cell, rinse the sample cell. If
the readings do not become stable, replace the
sample cell.
There are bubbles on the stir bar. Look for bubbles on the stir bar. If there are bubbles
on the stir bar, replace the stir bar.
There is a blue stain on the sample cell. Replace the sample cell. Use the reagent set with
the modified R2 (citric acid) reagent.
Reagent
pressure is low.
A bottle cap is not on tightly or does not
make a good seal.
Remove the bottle caps. Clean the rim of the
bottles. Examine the inner surfaces of the bottle
caps for unwanted material. Fully tighten the bottle
caps on the bottles. Make sure the fittings are tight
on top of the bottle caps.
There is a leak or a bad seal in one of
the reagent bottles or tubes.
Complete the diagnostic test for low reagent
pressure. Refer to Diagnostic test for low reagent
pressure on page 12.
Diagnostic test for reagent delivery valves
1. Remove power to the analyzer. Keep the sample and reagent bottles pressurized.
2. Remove the cover from the sample cell.
3. Dry the tubes that are attached to the sample cell cover.
4. Hold the sample cell cover above a dry towel for a minimum of 10 minutes. Make sure that the
tubes do not touch the towel.
5. After 10 minutes, look for fluid to fall from a tube. If fluid falls from a tube, there is a leak in the
valve that is plumbed to the tube.
Diagnostic test for reagent delivery
1. Push diag, then select PERFORM TEST>REAGENT DELIVERY.
2. Set each reagent valve to supply 2000 µL (2 mL).
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