How do I test my sensor for APHA Top-of-Scale?

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If the customer standardizes with no sample or water in the light path ( blanks with air) and then takes a measurement with no sample or water in the light path (reads air) what APHA do they get?

If they get less than 0.1 when reading Air then there is no problem with the sensor the problem is with the placement of the cell or the stability of the water.

 

 

 

 

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