How to Troubleshoot Ratio Control: Causes, Tests and Solutions
Instrument engineer beside two flow-controlled pipelines merging into a mixer Sunrise-orange process plant scene: an engineer with an open laptop stands beside two parallel pipelines, each with a transmitter and a control valve, that merge into a mixing vessel. Original self-drawn illustration; no text. Figure V01. Ratio-control troubleshooting begins by checking the complete path from measured flows and setpoint arithmetic to the final control element. Original self-drawn illustration Text alternative for this figure Engineer with an open laptop beside two flow-controlled pipelines with transmitters and valves merging into a process mixer at sunrise. Educational engineering guide · Updated 2026-10-11 · Worked-example data are illustrative unless labelled SOURCE. Quick answer To troubleshoot ratio control, start by confirming the intended relationship: the controlled-flow setpoint should normally be calculated as the ratio multiplied by the measured wild flow. In...