pH Measurement of Chlorine Dioxide Bleaching in Paper Mills
Accurately measure pH levels within the pulp & paper industry
pH Sensor Resists Coating for a Longer Life
pH is measured in the chlorine dioxide towers of paper mills to control the bleaching reaction conditions and in the extraction stages to control the addition of the caustic used for extraction. While accurate pH measurement is critical in the chlorine dioxide and extraction stages, these applications are among the most challenging in a pulp mill. The high pulp consistency of the process stream and harsh bleaching chemicals degrade the performance of most general-purpose sensors as the sensors can require frequent cleaning, and may not be able to withstand the harsh oxidizing environment. The Rosemount™ RBI pH Sensor is a great choice for the bleaching process in paper mills. Multiple isolation chambers behind the reference junction act as barriers to protect the inner reference from contact with the harsh chemicals, while the high surface area of the reference junction resists plugging and maintains the electrolyte flow needed for a stable pH signal.
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Product Solutions
The Rosemount RBI pH Sensor / ORP Sensor features a multi-junction reference design, making it ideal for use in tough applications containing sulfides and other poisoning ions. The pH/ORP sensor is offered with various configurations to meet a wide variety of installation requirements.
- Maximize pH/ORP sensor life with multi-junction reference
- Highly chemical resistant rugged Kynar® body
- Retractable option for use with ball valve assemblies
Measurement Range
pH sensor: 0 to 14
ORP sensor: -1500 mV to 1500 mV
ORP sensor: -1500 mV to 1500 mV
Materials of Construction
Wetted Materials: Kynar®, titanium (retractable 547 only), porous PTFE, wood, glass, and choice of EPDM, Viton™ or Kalrez®
Maximum Temperature
248 °F (120 °C) at 40 psig (276 kPa [abs])
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.)
