Why does my Sension+ TDS (total dissolved solids) result not match laboratory results?

Document ID

Document ID TE2902

Published Date

Published Date 27/05/2017
Question
Why does my Sension+ TDS (total dissolved solids) result not match laboratory results?
Summary
Sension+ TDS accuracy
Answer
TDS results are derived from conductivity.  The Sension+ meters use a TDS factor of 0.64 by default.  This factor can be adjusted and for best accuracy it should be determined by a USEPA gravimetric method such as Hach method 8163.  Gravimetric methods determine true solids content by a combination of filtering, evaporation and weight.