Conductivity Measurement in the Desalination of Seawater
Liquid analysis within the water & wastewater industry
Accurate Conductivity Measurement When Sensor is Coated
During the desalination of seawater process, treated seawater is heated in an evaporator with its resulting vapor collected and recondensed in the condenser. The condenser product is fresh water, while the evaporator product is removed as brine. Scaling can occur in the evaporator if the calcium sulfate concentration gets too high. Conductivity is measured in the evaporator to control scaling by triggering the removal of the heavy brine. The Rosemount™ 228 Toroidal Conductivity Sensor is a great solution for this application as it provides accurate measurements even when coated.
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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 1058 Dual Channel Transmitter provides confident liquid analysis measurement in a wide range of industrial, municipal and commercial applications. It is a 4-wire powered device that provides multi-parameter liquid analysis for digital and analog sensors, including inputs from pH/ORP sensors, ISE, flow, current, conductivity sensors (contacting and toroidal), turbidity sensors and amperometric sensors (dissolved oxygen, chlorine and ozone).
- Supports continuous measurement of liquid analysis inputs from one or two sensors.
- Each sensor channel is independently configurable to support a wide selection of digital or analog liquid analysis sensors including pH sensors, ORP sensors, conductivity sensors, dissolved oxygen sensors, chlorine senors, turbidity sensors and more.
- IP66 / Type 4X rated engineered polymer enclosure with universal mounting options provides confident and easy installation indoors or outdoors.
Enclosure Rating
Type 4X, IP66
Dimensions
Overall 160 x 157 x 140 mm (6.3 x 6.2 x 5.5 in); Cutout 138.4 x 138.4 mm (5.45 x 5.45 in)
Weight
3 lb (1.5 kg)
The Rosemount 1056 Transmitter offers single or dual sensor input with an unrestricted choice of dual measurements, reducing the cost per loop and saving panel space. This multi-parameter liquid analysis transmitter offers a wide range of measurement choices, including differential conductivity, dual oxygen and many other combinations supporting most industrial, commercial and municipal applications. The modular design of the transmitter allows signal input boards to be field replaced making configuration changes easy.
- Fast and easy installation using Quick Start programming, auto-recognition of sensor boards and modular design
- Large customizable display provides at-a-glance view of pertinent information
- Visibility of process parameters by utilizing HART® or Profibus DP digital communications
Enclosure Rating
Polycarbonate. Type 4X, IP65.
Certifications/Approvals
FM/CSA/UL (See Product Data Sheet for complete list of certifications.)
Dimensions
Overall 155 x 155 x 131mm (6.10 x 6.10 x 5.15 in.). Cutout: 1/2 DIN 139mm x 139mm (5.45 x 5.45 in.)
The Rosemount 1066 Single Channel Transmitter supports continuous measurement of one liquid analytical input - pH sensor, conductivity sensor, chlorine sensor, dissolved oxygen sensor or ozone sensor. The design supports easy internal access and wiring connections. The large display gives excellent visibility for live measurements and displayed parameters. Conveniently, live process values are always displayed during programming and calibration routines.
- Fast and easy installation using Quick Start programming
- Intrinsically Safe FM, CSA, and ATEX/IECEx Hazardous Location Approvals
- Visibility of process parameters by utilizing HART® or FOUNDATION™ Fieldbus digital communications
Power Supply
Supply voltage at the transmitter terminals should be at least 12.7Vdc. Power supply voltage should cover the voltage drop on the cable plus the external load resistor required for HART® communications (250 Ω)
Weight
R2 lbs/3 lbs (1 kg/1.5 kg)
Communication Protocol
HART™ Communications & diagnostics: PV, SV, TV, and 4V assignable, temperature
