EMERSON
Measurement Instrumentation
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Rosemount™ 350A High Performance pH/ORP Sensor

Rosemount™ 350A improves pH and ORP measurement in harsh liquid applications with reliable performance, longer sensor life, and predictive diagnostics.

The Rosemount 350A high performance pH/ORP sensor measures pH and ORP in high-temperature, high-pressure, and other harsh liquid applications. Used in chemical processing, refining, power generation, pulp and paper, metals and mining, and industrial water treatment, it helps plants maintain more stable pH and ORP measurement in difficult process conditions. Built for demanding service, it helps reduce maintenance, extend sensor life, and support process control with a rebuildable double junction reference, selectable electrolyte options, predictive diagnostics, maintenance timing visibility, and stored calibration history. Predictive diagnostics and stored calibration and process data help teams detect drift earlier, plan maintenance at the right time, reduce unplanned downtime, and maintain more stable process control.

Key Features

  • Improve reliability in harsh service: Measures pH and ORP in high-temperature and high-pressure processes up to 155 °C and 400 psig. 
  • Extend sensor life: A rebuildable double junction reference and selectable electrolyte options help reduce drift, resist contamination, and support longer service intervals.
  • Maintain process control with stable measurement: Delivers dependable pH and ORP performance in applications affected by fouling, coating, oil, metals, biofilm, poisoning, or scaling.
  • Simplify installation and startup: A digital M12 connection with Modbus communication helps reduce wiring complexity and speed setup.
  • Make maintenance timing easier to manage: Predictive diagnostics, stored calibration history, and stored process data help teams identify sensor drift sooner, plan service before performance declines, reduce unplanned downtime, and replace sensors faster.
  • Protect performance in plant environments: IP67/IP68 ingress protection helps defend against water and dust in demanding conditions.