389-01-12-55 Rosemount General Purpose pH ORP Sensor | Process Probe

389-01-12-55 Rosemount™ General Purpose pH/ORP Sensor

Rosemount™ 389-01-12-55 delivers stable analytical measurement performance in demanding process environments.

The sensor combines rugged mechanical construction with long-term electrochemical stability.

Its triple junction reference structure protects against aggressive contamination and poisoning ions.

The enhanced glass formulation minimizes cracking risks during thermal and chemical cycling.

This configuration supports continuous ORP monitoring with a platinum sensing element.

The integrated preamplifier simplifies signal transmission in industrial installations.

389-01-12-55 supports insertion, immersion, and flow-through mounting configurations.

Engineered for Continuous Process Reliability

• Triple junction technology improves sensor operational lifespan.
• Ceramic junction structure stabilizes reference performance.
• Viton® sealing components improve chemical durability.
• Tefzel® body construction withstands aggressive process media.
• Integral preamplifier minimizes signal degradation over long cable distances.
• SMART sensor functionality accelerates transmitter recognition.
• Preloaded calibration data reduces field commissioning time.

Core Technical Characteristics

• Brand: Rosemount™
• Model: 389-01-12-55
• Series: Rosemount™ 389 General Purpose Sensors
• Measurement Type: ORP Measurement
• Measurement Range: -1500 to +1500 mV
• pH Range: 0 to 14 pH
• Temperature Range: 32 to 185 °F (0 to 85 °C)
• Automatic Temperature Compensation: 32 to 185 °F
• ORP Electrode Material: Platinum
• Reference Junction: Ceramic
• Seal Material: Viton®
• Body Material: Polyester/polycarbonate
• Process Fittings: 316 stainless steel
• Front Process Connection: 1-in. MNPT
• Rear Process Connection: 1-in. MNPT
• Sensor Connection: 1-in. NPT adapter
• Flow Cell Pressure Rating: 90 psig
• Flow Rate: 2 to 5 GPH
• Flow Cell Temperature: 32 to 158 °F
• Preamplifier Cable: Integral 25-ft. cable

Global PLC Spare HUB's Insight

Process engineers often select the Rosemount™ 389 Series for chemically unstable applications.

The triple junction reference design performs effectively in sulfide and ammonia exposure conditions.

The integrated preamplifier improves signal integrity in electrically noisy plant environments.

The sensor performs reliably in continuous-duty liquid analysis loops.

Its rugged threaded body simplifies retrofits in existing analytical skids.

The SMART compatibility reduces commissioning complexity during maintenance shutdowns.

Compatible Equipment Platforms

• Rosemount™ 56 analytical transmitters
• Rosemount™ 1056 multiparameter analyzers
• Rosemount™ 1057 single-channel transmitters
• Rosemount™ 1066 process transmitters
• Rosemount™ 5081 process analyzers
• Industrial water treatment skids
• Chemical injection systems
• Wastewater neutralization systems
• Cooling tower monitoring loops
• Inline process analytical panels

Recommended Industrial Applications

• Municipal water treatment facilities
• Industrial wastewater processing
• Power generation chemistry loops
• Chemical production plants
• Pulp and paper processing
• Mining process water analysis
• Food and beverage cleaning systems
• Cooling water corrosion monitoring

Diagnostic and Operational Advantages

• Fast sensor recognition minimizes startup delays.
• Stored calibration values reduce human calibration errors.
• Stable reference performance supports long maintenance intervals.
• Integral preamplifier reduces electrical interference risks.
• Chemically resistant materials improve operational consistency.
• Field replacement procedures require minimal tooling.

Installation and Handling Notes

• Install the sensor away from direct mechanical vibration.
• Use shielded cable routing near variable frequency drives.
• Verify process pressure before installation.
• Maintain proper immersion depth during submersion mounting.
• Avoid dry storage after commissioning preparation.
• Clean the platinum electrode regularly in scaling applications.

Shipping and Warranty Information

• 12-month warranty coverage included.
• Protective industrial packaging supplied.
• FedEx international shipping available.
• UPS global delivery available.
• DHL express logistics supported.
• Fast dispatch for urgent maintenance requirements.

Professional FAQ

Why does triple junction technology matter in ORP measurement?

The design isolates contaminants and extends reference stability in chemically aggressive liquids.

How can engineers reduce ORP signal drift during operation?

Maintain clean electrode surfaces and avoid air bubble accumulation around the sensing tip.

Which process conditions benefit most from this sensor design?

Applications containing sulfides, cyanides, chlorine, or ammonia benefit significantly from this configuration.

What should users evaluate before selecting cable length?

Consider transmitter distance, electrical noise exposure, and installation routing conditions.

Why do many plants prefer integrated preamplifier configurations?

The integrated electronics improve signal stability and simplify analytical loop troubleshooting.

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