Rosemount™ 228 Toroidal Conductivity Sensor

The Rosemount 228 Toroidal Conductivity Sensor reliably measures conductivity in highly conductive electrolyte solutions up to 2 S/cm (2,000,000 µS/cm). These conductivity sensors work in dirty and corrosive applications where metal electrode sensors would otherwise fail. A robust sensor design makes the Rosemount 228 conductivity sensor ideal for measuring concentrations of acid, base and salt solutions.

• Meet challenging application requirements with a selection of chemical resistant body options including PEEK and Tefzel
• High vibration tolerance with reinforced internal metal frame design
• High temperature option for process temperatures up to 200 °C (392 °F) and suitable for use under high pressure up to 295 psig (2135 kPa [abs])
• Suitable for insertion and submersion type applications
• Versatile mounting options featuring either a 3/4" MNPT or 5/8" 11 UNC process connection
• Eliminate the need to shut down your process when removing conductivity sensors from piping and tanks by using an optional retraction assembly kit

1. Exceptional Fouling and Scaling Resistance

· Electrodeless Design: The absence of exposed electrodes fundamentally eliminates measurement drift and failure caused by electrode fouling, coating, corrosion, or abrasion, offering unmatched reliability in harsh conditions.

2. Ideal for Extreme Applications

· Capable of handling high-concentration slurries, viscous fluids, fibrous media, and corrosive chemicals like strong acids and bases, which would rapidly degrade traditional contacting electrodes.

3. Wide Measurement Range

· Designed for measuring high conductivity solutions, typically covering ranges from tens of thousands μS/cm to hundreds of thousands μS/cm, up to 2,000,000 μS/cm, making it perfect for concentrated acids, bases, and salt solutions.

4. Rugged Construction

· The sensor body is typically constructed from chemically resistant materials (e.g., PFA, PTFE, PVDF), offering a robust build that can withstand high temperatures, pressure, and mechanical stress.

5. Minimal Maintenance

· With no electrodes to clean or replace, maintenance is significantly reduced, often limited to periodic physical inspection, leading to a lower total cost of ownership.

· Concentrated Acid/Base Concentration: Online monitoring of sulfuric acid, hydrochloric acid, caustic soda, etc.

· High-concentration salt solutions in process streams.

· Mining Slurries & Process Water: Conductivity measurement in slurries with high solids content.

· Wastewater Treatment: Conductivity monitoring of high-salinity wastewater, landfill leachate, scrubber blowdown.

· Chemical Recovery Processes.

· Seawater Desalination Pretreatment.

· Any harsh water quality environment prone to fouling or damaging contacting electrodes.

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