pH measurement and control plays a critical role throughout the hydrocarbon processing cycle to minimize corrosion and optimize operation performance. Traditional installations have suffered from poor reliability due to sensor coating and aggressive process conditions. The solution for reliable pH measurement uses a unique combined system approach utilizing automatic electrode cleaning and calibration plus sensors with intelligent diagnostics. This combination keeps the sensor in optimum condition, and the "sensor-wear" indicator advises when replacement is due.

Kenneth Queeney is Product Manager with Mettler-Toledo Ingold, Bedford, Massachusetts. He has over 25 years experience with process analytical applications, and has written several papers on these topics. Mr. Queeney holds a BS in chemistry and an MS in environmental engineering.