pH Measurement & ORP Measurement in the Desalination of Seawater
Liquid analysis within the water & wastewater industry
Extended pH/ORP Sensor Life
In the desalination process, seawater is first filtered to remove solids and then combined with acid. The treated seawater is then heated in an evaporator, which can create a scale formation on the hot surfaces of the evaporation equipment if pH levels are too high. Careful monitoring and control of the pH levels with an acid addition can minimize some of the scaling problems that occur in the evaporator. Chlorine is often added as a biocide, but excess chlorine must be removed. ORP measurements can be used to monitor chlorine and control additions of de-chlorination agents. The Rosemount™ 3900 pH/ORP Sensor is ideal for this application due to its rugged design and extended sensor life.
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Product Solutions
The Rosemount 3900 pH Sensor / ORP Sensor features a double junction reference that aids in the sensors' resistance to harsh environments and helps prolong sensor life. The double junction protects the reference element from poisoning ions-such as ammonia, chlorine, cyanides, and sulfides. Both sensors are made with a porous Teflon® junction. The robust ph/ORP sensor design provides reliability in a wide range of aqueous solutions found in pipelines, open tanks or ponds.
- Extended pH sensor / ORP sensor life and protection against poisoning ions using a double junction reference
- Enhanced performance and increased life with cracking resistant glass
- Maximum chemical resistance provided by a rugged polyphenylene sulfide body
Operating Temperature
–10° to 100°C (14° to 212°F)
Max. Operating Pressure
Maximum Pressure: 790 kPa [abs] (100 psig) at 100°C (212°F)
Materials of Construction
Stainless steel, glass, Teflon®, polyphenylene sulfide (PPS), EPDM and silicone (If selecting the ORP sensor, an additional wetted material is Platinum.)
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
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
