Why is the Pocket Colorimeter II™ flashing 0.0 or 2.2?

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ID Artigo TE550

Data da Publicação

Data da Publicação 12/31/2019
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Question
Why is the Pocket Colorimeter II™ flashing 0.0 or 2.2?
Summary
Pocket Colorimeter II™ flashing 0.0 or 2.2
Answer
On a Pocket Colorimeter™ II, a flashing 0.0 or 2.2 reading indicates that the sample is either under or over measuring range. 

Depending on which Pocket Colorimeter II™ is in use, and the range that is selected, a number other than 2.2 may flash (the number will depend on the high end limit of the selected range). In either case, this most likely means that the sample concentration is above the upper limit of the selected range.

If the instrument flashes 0, 0.0, or 0.00, the sample concentration is probably zero or below the detection limit of the instrument.

There are a couple of things one can check:
  • Verify that the range selected is the correct range to use for the sample in question.
  • If possible, switch the range and analyze the sample again. (Note: the procedure for the alternate concentration range may require a different sample cell or different reagent).
  • At very low concentrations, any optical differences in the sample cells become significant. Try using one sample cell for both zeroing the instrument and reading the sample to minimize these optical differences.
  • If possible, try to measure a sample with a known concentration, such as a SpecCheck standard or a primary standard solution.
  • Verify the correct sample cell is being used.  Different chemistries and ranges will use different sample cells.
  • Verify the sample cell compartment is clean.
  • Verify the sample cell is clean and not scratched.
  • When using SpecCheck Standards, be sure to zero the instrument with the blank vial that comes in the SpecCheck set and not with water.
  • When testing a parameter where the blank is darker than the sample, such as fluoride or ozone, be sure to zero on the correct vial. The method document will indicate which vial is correct (in cases like this, the darker blank vial is often what is zeroed on, not the lighter sample vial). Some SpecCheck Standards, such as for fluoride and ozone, require zeroing with one of the standard vials and then reading the clear blank. The following articles discuss this in more detail: What is the procedure for the SpecCheck Gel Secondary Standard Set, Fluoride?   What is the procedure for using SpecCheck Gel Secondary Standard Set, Ozone, Mid-Range?
Contact technical support if these suggestions don't resolve the issue.

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