Why is my 5500 AMC analyzer failing calibration?

Document ID

Document ID TE6855

Published Date

Published Date 08/13/2020
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Question
Why is my 5500 AMC analyzer failing calibration?
Summary
Troubleshooting a 5500 AMC analyzer calibration failure.
Answer
There are many reasons why the calibration might fail on the 5500 AMC analyzer; below are how to find the 3 most common causes.
 
1.  If your calibration is failing with Standard 2 values at or close to 0, you may have a clog in the R3 capillary tube.
(If you're expecting your sample monochloramine levels near the total chlorine, and free ammonia is near zero, then the readings on the analyzer can appear just fine, even when the R3 capillary is clogged.)
The R3 reagent is only used with Cell 2 during the calibration. Because this valve/tubing assembly is used less frequently than the rest, that tube is prone to clogs or losing a prime. The issue can be easily resolved or found by performing a delivery test on the R3 to Cell 2 via the Diag Menu.
  • Go to Diag / Perform Test, press [Enter].
  • The analyzer will ask if you want to interrupt the current sample; select YES and then press [Enter].
  •   In the Perform Test menu, go to Reagent Delivery / Cell2 / R3, then press [Enter].
  • Disconnect the R3 capillary tube from Cell 2.  The tube will start at the top of the red R3 valve on the right and connect to the bottom of the colorimeter on the right, cell 2.
  • If your R3 isn't flowing, you most likely have a clog.  Sometimes just exercising the valve will fix the issue but other times you may need to change out the capillary tube, Part number: 9568602 -Black Capillary Assembly
  • If your R3 is flowing and priming via this delivery test continue to numbers 2 & 3 below
2.  If your sample values are lower than expected and your calibration has failed, test to make sure all reagents are feeding properly.
Follow the same steps outlined below and focus on each reagent going to each cell, make sure to check all 6 valves/tubes. 
 
  • Go to Diag / Perform Test, press [Enter].
  • The analyzer will ask if you want to interrupt the current sample; select YES and then press [Enter].
  • In the Perform Test menu, go to Reagent Delivery / you will want to individually test all valves for Cell 1 and Cell 2 / then press [Enter].
  • Disconnect the capillary tube for the reagent being tested from Cell1 or Cell 2.  Below is a schematic of the reagent valves and which cell they should connect to.
  • The liquid from the tube should flow freely.  If the liquid is 'spitting' or 'sputtering' there may be air in the lines. If this is the case, tighten reagent bottle caps and try again.  You may need to replace the bottle seal assemblies if they show signs of any issues.
  • If you are still not getting flow, it may be an issue with the capillary tube or the valve itself.  New capillary tubing assemblies are included in the 5500 AMC maintenance kit.  New reagent valves can be ordered using part number 6783700.
  • If all of your reagents are flowing and priming via this delivery test continue to numbers 3 below
 
 
3. If your sample values appear to be normal but your calibration has failed, test to make sure the standard is feeding properly.
  • Go to Diag / Perform Test, press [Enter].
  • The analyzer will ask if you want to interrupt the current sample; select YES and then press [Enter].
  • In the Perform Test menu, go to Cal Sol Delivery / Cell1 / Standard 1, then press [Enter].
  • The display will show "50 seconds" timer; press [Enter].
  • The display will show "Press Enter to Proceed". Open the front panel so you can see the colorimeter drain tubes, then press [Enter].
  • You should see a continuous flow of liquid from the Cell1 (on the left as you view from behind). There will be bubbles in the flow, and it will sometimes appear to flow faster or slower; this is normal. If you see flow though the drain tube, then you may press [Exit] to stop the test.  If you are having trouble seeing the drain, you can also disconnect the standard tube going from the valve to the cell (This will be similar to what was performed above for the reagents.  Below is the valve assembly configuration for standards)
  • Repeat the above, selecting Cell2.
  • Repeat the above, selecting Standard 2 (for both Cell1 and Cell2).
  • If either of the standards aren't being delivered, you may need to look for a kinked or pinched tube, or there may be a faulty valve or other part in the analyzer.

See the following articles for additional information that may be helpful in troubleshooting a failed calibration on a 5500 AMC
What is the Catalog Number/ Order Code for the reagent valve for the 5500sc AMC, 5500sc/961Xsc silica and phosphate analyzers?
What is the purpose of the two
What is the pass/fail criteria for the auto calibration on the 5500sc AMC analyzer?
What is reagent 3 used for on the AMC 5500sc?
The below article is written for 5500/961X silica/phosphate, but the reagent replacement procedure & associated issues will also apply to the 5500 AMC
Why does the error 'Reagent pressure low' warning show up after replacing the reagents on the 5500sc / 961x sc?
 

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