Which pH probe works best in applications with high ammonia levels?

Document ID

Document ID TE2145

Version

Version 4.0

Status

Status Published

Published Date

Published Date 03/30/2018
Question
Which pH probe works best in applications with high ammonia levels?
Summary
Strong ammonia levels and how they will effect a pH sensor.
Answer
Hach’s pHD differential electrode is nearly ideal for samples containing strong ammonia. Normal conventional reference electrodes are destroyed in strong ammonia because the silver chloride wire inside the reference will be dissolved by the ammonia. This will cause the potential to drift and destroy the electrode, leading to bad pH readings. This damage is irreversible. Hach’s pHD differential electrode is protected against this type of damage because the silver chloride wire is encased by a glass electrode that protects it from the ammonia. With the pHD, the ammonia never gets to the wire, and the probe works fine.

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