Conductivity Measurement of Chemical Concentration Control
An economical and widely used technology
Superior Corrosion & Coating Resistance
Conductivity is used to monitor chemical concentration and control it by adjusting the ratio of water to acid or caustic. Chemical concentration control applications can be hard on conductivity sensors as high concentrations of acid or caustic can corrode the metal electrodes. In many concentration control applications, such as cleaning solutions, the acid or caustic solution is recycled back to the concentration control mixing tank for re-use. This can lead to the accumulation of solids in the solution that can coat or plug the electrodes on contacting conductivity sensors, resulting in an unreliable measurement. The Rosemount™ 228 Toroidal Conductivity Sensor is an excellent solution for most concentration control applications due to its superior corrosion and coating resistance compared to contacting conductivity sensors.
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Product Solutions
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])
Process Connection
-20: 5/8 in. -11 UNC, -21: 3/4 in. MNPT
Valve Type
Recommended Valve: 1-1/2 in. full port ball valve
Materials of Construction
Wetted Materials:
Body Materials either glass-filled PEEK, glass-filled Tefzel™ or unfilled Tefzel; Option -20: EPDM gasket
Body Materials either glass-filled PEEK, glass-filled Tefzel™ or unfilled Tefzel; Option -20: EPDM gasket
The Rosemount 225 Toroidal Conductivity Sensor is intended for use in pharmaceutical and food & beverage applications where a sanitary design is required. This conductivity sensor is corrosion and fouling resistant and is ideal for measuring the concentration of CIP solutions, detecting product/water interfaces, checking product quality, and monitoring eluents in chromatographic separations.
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Meets various sanitary requirements:
- USP Class VI compliant
- FDA food contact 21CFR177.2415 compliant
- 3-A Sanitary Standard 74-06 compliant
Maximum Temperature
Glass-filled PEEK Sensor & Unfilled Tefzel™ Sensor: 230 °F (110 °C) / 200 psig (1480 kPa [abs])
Unfilled PEEK Sensor: 266 °F (130 °C) / 200 psig (1480 kPa [abs])
Unfilled PEEK Sensor: 266 °F (130 °C) / 200 psig (1480 kPa [abs])
Measurement Range
200 μS/cm - 2 S/cm
Dimensions
Cable Length: 20 ft (6.1 m)
The Rosemount 226 Toroidal Conductivity Sensor measures conductivity in highly conductive liquids up to 2 S/cm (2,000,000 μS/cm). This toroidal/inductive sensor has a robust fouling-resistant design which makes it ideal for measuring conductivity in harsh, corrosive and fibrous liquid applications.
- Toroidal sensor is resistant to plugging and suitable for liquids containing high levels of suspended solids due to large bore design
- Plugging resistant and suitable for liquids containing high levels of suspended solids due to large bore design
- High vibration tolerance with reinforced internal metal frame design
Temperature Range
32°F - 248°F (0°C - 120°C)
Maximum Pressure
295 psig (2135 kPa [abs])
Materials of Construction
Wetted Materials: Glass-filled PEEK, EPDM Gasket
The Rosemount 56 Dual Channel Transmitter is a line powered device that can accept inputs from pH/ORP sensors, ion selective electrode (ISE) sensors, flow, current, conductivity (contacting and toroidal) sensors, turbidity sensors, dissolved oxygen sensors, chlorine sensors and ozone sensors.
- Retrieve calibration and measurement information by accessing the data logger via USB
- Design efficient processes by utilizing the built-in PID controller
- At a glance view of pertinent information provided by the large customizable display
Certifications/Approvals
FM: Class I, Division 2, Groups A, B, C, & D • Class Il & lll, Division 2, Groups E, F,&G • T4
Weight
Rounded up to nearest lb or nearest 0.5 kg: 3 lbs/4 lbs (1.5 kg/2.0 kg)
Measurement Range
pH sensor: 0 to 14 pH
ORP Sensor: -1500 to +1500 mV
ORP Sensor: -1500 to +1500 mV
