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Rosemount™ 389VP General Purpose pH/ORP Sensor
Rosemount 389VP pH/ORP Sensor
The Rosemount 389VP pH Sensor / ORP Sensor is housed in a molded Tefzel™ body with Viton™ o-rings, making each sensor virtually indestructible and chemically resistant.
Complete encapsulation eliminates leakage or high humidity problems traditionally found in other pH/ORP sensor designs. The simplified construction, designed with user convenience in mind, does not require electrolyte (KCl) replenishment or any high maintenance troubleshooting procedures.

How pH SensorsWork

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pH Measurement Challenges in Harsh Chemical Applications

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Rosemount™ 389VP General Purpose pH/ORP Sensor


Temperature Range
32 - 182 °F (0 - 85 °C)
Max. Operating Pressure
100 psig (790 kPa) at 150 °F (65 °C)
Materials of Construction
pH sensor body: Tefzel™
pH electrode: glass
ORP electrode: platinum
Junction: ceramic
O-Ring: Viton™
Process Connection
Front- & rear-facing: 1 in (MNPT)


  • Triple junction reference prolongs pH sensor/ORP sensor life and protects against poisoning ions such as ammonia, chlorine, cyanides, and sulfides
  • Enhanced performance and increased life with cracking resistant glass
  • Available with a glass electrode option for high pH applications
  • Superior chemical resistance provided by a rugged Tefzel body with Viton O-rings
  • The molded sensor body features 1” MNPT front and rear facing process connections for insertion, submersion, and flow-through applications
  • Variopol (VP6) cable connection option, for quick cable-to-sensor release, eliminates cable twisting
  • SMART enabled for pH measurements