The HQd meter reads #### mg/L on a standard when trying to calibrate an ISE. What causes this error?

Document ID

Document ID TE577

Published Date

Published Date 27/05/2017
Question
The HQd meter reads #### mg/L on a standard when trying to calibrate an ISE. What causes this error?
Summary
Reading of # # # # mg/L on an HQd meter
Answer
A reading of # # # # mg/L indicates that the measurement is below what is expected for the corresponding mV of that particular standard. Verify that the correct standard is being used and that the standard was prepared correctly. Make sure that the pH is within the correct range and that the correct ionic strength adjustor is added.