Dissolved Oxygen Monitor Troubleshooting: High Readings at Low Oxygen Levels

This document identifies two primary causes of erroneously high readings in dissolved oxygen monitors at low oxygen levels: moisture ingress at the rear sensor contacts and air ingress into sample lines. It provides troubleshooting advice, including drying procedures for the sensor and connector, and emphasizes the critical importance of using stainless steel or nylon sample pipework to prevent oxygen permeability.