How to Choose an Inline pH Sensor for RO System

Reverse osmosis systems need tight pH control to prevent membrane scaling and ensure permeate quality. Knowing how to choose inline pH sensor for RO system installations can save maintenance time and protect expensive membranes.

1. Select the Right Electrode Body Material

RO permeate and concentrate streams are often low in ions, which makes pH measurement challenging. Use a high-impedance glass electrode with a low-resistance glass membrane for fast response in low-conductivity water.

2. Consider the Mounting Style

An online pH electrode can be mounted directly in-line, in a bypass loop, or inside a flow cell. Inline mounting is ideal when pipe diameter and flow velocity are suitable; flow cells are better for calibration and sensor protection.

3. Temperature Compensation

RO water temperature varies with feed conditions. Choose an industrial pH sensor with automatic temperature compensation (ATC) to maintain accuracy across the operating range.

4. Maintenance and Calibration

Low-ion water can shift calibration quickly. Plan weekly buffer checks and use quality reference buffers of pH 4.01, 7.00, and 10.01. Select sensors with easy-to-replace reference junctions.

Get Expert Support

Aquametrax offers industrial pH sensors and online pH electrodes for RO systems and wastewater treatment. Contact our team for selection assistance and OEM options.