When an ORP reading is out of range in a chrome reduction tank, what should you first check?

When the ORP (Oxidation-Reduction Potential) reading is out of range in a chrome reduction tank, an important step is to assess the range of pH values. The ORP readings can be significantly influenced by the pH of the solution. Different chemical reactions occur at varying pH levels, which can either promote or hinder the reduction of chromium.

If the pH is outside of the optimal range for the specific reactions intended in the chrome reduction process, it can lead to unstable ORP readings. Therefore, checking the pH levels first can provide crucial insights into the state of the solution and help determine whether adjustments are needed to bring the ORP back within the desired range. This understanding helps ensure the effectiveness of the treatment process being monitored.