389-01-12-55 pH/ORP Sensor | Triple Junction & VP8 Option

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

Reliability meets robustness. Engineered for demanding industrial environments. This sensor delivers accurate measurements with long-term stability.

Key Features

• Triple junction reference – resists poisoning ions (ammonia, chlorine, cyanides, sulfides). Extends sensor life.
• Cracking-resistant glass – enhances performance and increases operational lifespan.
• High-pH glass option – available for demanding alkaline applications.
• Tefzel® body & Viton® O-rings – provide superior chemical resistance.
• 1-in. MNPT connections – front and rear facing for insertion, submersion, or flow-through.
• Variopol (VP8) cable option – quick release eliminates cable twisting (389VP).
• Smart preamplifier – automatic recognition by Rosemount transmitters (56, 1056, 1057, 1066).
• Plug-and-play calibration – stores data for pre-calibrated field installation.

Technical Specifications

• Brand: Rosemount™
• Model: 389-01-12-55
• Series: 389 General Purpose pH/ORP
• Measurement ranges
  • pH: 0 to 14
  • ORP: -1500 to +1500 mV
• Temperature range: 32 to 185 °F (0 to 85 °C)
• ATC range: 32 to 185 °F (0 to 85 °C)
• ORP electrode: Platinum
• Junction: Ceramic
• O-ring material: Viton®
• Process connections: 1-in. MNPT (front and rear)
• Wetted materials
  • Body & nut: Polyester/polycarbonate
  • Fittings: 316 stainless steel
  • Seals: Silicone
• Flow cell ratings
  • Temperature: 32 to 158 °F (0 to 70 °C)
  • Max pressure: 90 psig (721 kPa [abs])
  • Flow rate: 2 to 5 gal/h (7.6 to 18.9 L/h)
• Sensor thread: 1-in. NPT adapter
• Cable: Integral preamplifier, 25-ft (7.6 m)
• Compatibility: Rosemount 56, 1056, 1057, 1066, 5081 (codes -01, -03, -04, -05, -06)

Installation & Maintenance

• Mounting: Insertion, submersion, or flow-through with 1-in. MNPT.
• VP8 option: Quick cable release prevents twisting during installation.
• Smart preamplifier: Auto-recognition by transmitters reduces setup time.
• Calibration data storage: Pre-calibrate sensors in the lab for instant field use.
• Maintenance: Simple routine cleaning; rugged body withstands harsh conditions.

Compatibility & Certifications

• Transmitters: Rosemount 56, 1056, 1057, 1066, 5081.
• Wetted materials: Compliant with industrial chemical resistance standards.
• Certification: CE marked. Meets relevant EMC and safety directives.

Package Contents

• Rosemount™ 389-01-12-55 pH/ORP sensor
• Integral preamplifier with 25-ft cable
• 1-in. NPT adapter
• User manual (digital download)

Warranty & Shipping

• Warranty: 12 months against manufacturing defects.
• Shipping: 12–24 hour dispatch from our warehouse.
• Carriers: FedEx, UPS, DHL – tracked and insured.

Expert Review

“Reliable workhorse for continuous pH/ORP monitoring.” The triple junction and cracking-resistant glass make this sensor ideal for chemical, water, and wastewater applications. Its smart preamplifier simplifies integration with Rosemount transmitters, reducing commissioning time. The VP8 cable option is a practical bonus for field maintenance. Overall, a cost-effective choice for demanding loops.

Manager’s Insight

“Minimize downtime with plug-and-play calibration.” Pre-calibrate sensors in your workshop and install instantly. The rugged Tefzel® body and Viton® seals handle aggressive chemicals. For high-pH streams, choose the glass electrode option. This sensor pays back quickly through extended life and fewer replacements.

Applications

• Chemical processing
• Water & wastewater treatment
• Food & beverage (CIP, product monitoring)
• Pharmaceutical manufacturing
• Power generation (cooling water, boiler feed)
• Mining & metal refining

Compatible Equipment

• Rosemount 56, 1056, 1057, 1066, 5081 transmitters
• Any PLC or DCS accepting 4–20 mA with SMART protocol
• Standard pH/ORP analyzers and controllers

FAQ

• What is the maximum temperature?

  185 °F (85 °C) for the sensor; 158 °F (70 °C) for the flow cell.

• Can I use this sensor for ORP only?

  Yes, model 389-01-12-55 is an ORP combination electrode.

• Does it work with non-Rosemount transmitters?

  Yes, with standard pH/ORP inputs, but smart features require Rosemount 56/1056/1057/1066/5081.

• How do I connect the VP8 cable?

  Simply plug and twist; it locks without tools.

• Is the sensor suitable for high-pH applications?

  Yes, optional glass electrode is available – contact sales for details.

• What is the expected sensor life?

  Typically 12–18 months, depending on process conditions and maintenance.

• How often should I calibrate?

  Every 1–3 months, or as per your quality protocol. Pre-calibration reduces field work.

• Which transmitter code should I select?

  Use codes -01, -03, -04, -05, or -06 for Rosemount 56/1056/1057/1066/5081.

Selection Guide

• Identify your measurement type: pH or ORP.
• Check process temperature and pressure – ensure within limits.
• Choose VP8 cable option if quick disconnection is needed.
• For high-pH or aggressive chemicals, confirm glass and body compatibility.
• Select transmitter that supports SMART preamplifier for best performance.
• Consider flow cell if installation is in a bypass line.
• Contact our team for custom cable lengths or special materials.

For inquiries: sales@powergearx.com | +86 18030005825

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