What should I do if the SP510 analyzer always reads hard?

Dokument-ID

Dokument-ID TE9081

Veröffentlichungsdatum

Veröffentlichungsdatum 05.01.2022
Frage
What should I do if the SP510 analyzer always reads hard?
Zusammenfassung
SP510 always reads hard
Antwort
If the SP510 always reads hard, see the steps below to troubleshoot.

1.  Check the flow.  If the flow is too low the sample cell will not flush all the color out of the colorimeter completely.  This will cause some of the color to zero out.  If the flow is too high some of the water will flow past the pinch block and cause the color to be diluted. Optimal flow is 200 mL/min.
 
2.  When the sample line is pinched off in the pinch block, pull the sample line from the front of the colorimeter.  No water should drip past the pinch block.  If water comes out while the line is pinched then check the flow to the instrument, it should be ~200 mL/min. Check the pressure plate on the pinch block as it should be finger tight and flush with the pinch block.  Check the back of the pinch blocks as they should be smooth with no grooves.  
 
3.  Verify that the instrument has a single stir bar in it.  Use a paper clip to retrieve the stir bar from the colorimeter.  If stir bar is not working, mix the sample by hand once the reagents have been added by using the end of a wooden handled cotton swab.  If you get a reading you have inadequate mixing and the stir coil must be replaced.
 
4.  Verify that the instrument is getting Buffer and Indicator solutions to the colorimeter.  Remove the two reagent lines from the "Y" connector that goes into the front of the colorimeter.  There should be one drop of each reagent per cycle. If no reagent comes out, check the pressure plate on the pinch block.  It should be finger tight and flush with the pinch block.  Check the back of the pinch blocks as they should be smooth with no grooves.  Check that the vent is clear for each reagent. 
 
5.  Verify that the chemistry is working.  Take one milliliter (mL) of each reagent and 80 mL of the sample and mix them together.  There should be a color change.  If there is no color change, the reagents should be replaced.
 
6.  Verify that the instrument can read a soft sample.  Clamp off the sample inlet line.  The next cycle of the instrument should read soft.  If not check the LED for an orange glow
 
7.  Clean the colorimeter:  Turn the analyzer off for cleaning.  Remove the stir bar from the colorimeter and then put 1-2 dropperfuls of 19.2 N sulfuric acid in.  Let sit for at least 15 minutes, or up to 45 minutes.  Then swab out the colorimeter with a wooden or paper handled cotton swab until the swab comes out clean.  Then put the stir bar back in, put the rubber plug back on top of the colorimeter, and turn the instrument back on to resume normal cycle.
 

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