Rosemount 396A pH/ORP Sensor Features Anti-Coating Reference Design

Emerson's Rosemount 396A pH/ORP sensor stores calibration data for bench calibration and replacement without field recalibration.
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May 7, 2026
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Rosemount 396A pH/ORP Sensor Features Anti-Coating Reference Design

Emerson's Rosemount 396A is a digital pH/ORP sensor for measuring pH and oxidation-reduction potential (ORP) in dirty, abrasive, and high-solids applications. It includes an anti-coating reference design with a through-wall reference junction featuring increased surface area at the junction for fouling applications, maintaining a steady pH/ORP signal even when the sensor is coated.

The sensor outputs Modbus digital protocol, supporting simplified installation and setup with compatible Rosemount liquid analysis transmitters. Calibration data is stored in the sensor for bench calibration and replacement without field recalibration, reducing commissioning time and service effort.

The 396A is a drop-in replacement for the legacy Rosemount 396P and 396PVP anti-coating sensors, allowing transition to digital technology without changing existing installations or accessories. It is rated IP67 and IP68 for protection against water and dust ingress, including submersion, for wet and washdown environments.

Suitable applications include chemical manufacturing, oil and gas refining, water and wastewater treatment, and pulp and paper operations where coating and fouling can affect measurement reliability.

Features:

  • Operating Pressure: 0 psig - 150 psig
  • Operating Temperature: 32° to 212°F (0° to 100°C)
  • Measurement Range: pH: 0 - 14;ORP: -1500 mV - 1500 mV
  • Construction Materials: Wetted Materials: Titanium, Polypropylene, Glass, O-Ring (EPDM), Platinum (ORP Only)
  • Process Connection: 1" NPT
  • Anti-coating reference design with helical reference pathway
  • Modbus digital protocol output
  • Calibration data stored in sensor for bench calibration and replacement without field recalibration
  • Drop-in replacement for Rosemount 396P and 396PVP sensors
  • Compatible with Rosemount liquid analysis transmitters
  • Through-wall reference junction with increased surface area for fouling applications
  • IP67 and IP68 rated for water, dust, and submersion protection
  • For use in dirty, abrasive, coating, and high-solids applications

Emerson Electric Co.
St. Louis, MO
(888) 889-9170
[email protected]
emerson.com