How reliable are results which are outside the measuring range of photometric test kits?

Document ID

Document ID TE7139

Published Date

Published Date 05/06/2017
Question
How reliable are results which are outside the measuring range of photometric test kits?
Summary
Reliability of under and over-range results
Answer
Results which are over or under range are not reliable and must be reported as e.g. >xx mg/l or < xx mg/l. Results which are out of the range can’t be used in any case for reporting purposes.
 
If results are over range the customer will have to dilute his sample or use a test with a different range.

In case of results below the range the operator must look for a test with an alternative measuring range.