pH Measurement in Paper Mill Headbox
Accurately manage pH levels in the paper making process
Reduce pH Sensor Cleaning & Replacement
Raw pulp typically has a higher pH than is desirable for paper
making. The addition of alum or sulfuric acid, either to the recycled whitewater feed or to the stock upstream of the fan pump, helps lower the pH to an optimal level. This lower pH level promotes binding of the fibers into the paper sheet. pH measurement in the paper mill headbox is difficult because of the high degree of suspended solids present in the pulp, making sensors prone to clogging and fouling. pH sensors in this application often require frequent cleaning and replacement. The Rosemount™ 396P pH/ORP Sensor was specifically designed for harsh, high suspended solids applications like paper making. The reference junction in the Rosemount 396P pH sensor has a high resistance to coating due to its large surface area and small pore size, greatly reducing the maintenance costs and downtimes typically associated with frequent sensor cleaning and replacement.
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Product Solutions
The Rosemount 396P pH Sensor/ORP Sensor, with integral cable, is specifically designed for improved life in harsh, dirty, and abrasive applications such as lime slurry waste treatment, paper machine headbox and pigment/dye applications, where large quantities of suspended solids are present. The pH/ORP sensor features a coating resistant TUpH large area reference junction and a rugged polypropylene body construction for maximum chemical resistance.
- Minimum pH/ORP sensor maintenance due to TUpH reference technology which ensures steady pH signal when sensor is coated
- Maximum pH/ORP sensor life due to helical reference pathway which hinders reference poisoning and cracking resistant glass
- SMART enabled for pH measurements
Measurement Range
pH sensor: 0 to 14ORP sensor: -1500 to 1500 mV
Operating Pressure
Hemi-bulb: 0 to 150 psig (0 to 10.34 barg)Flat-bulb: 0 to 100 psig (0 to 6.89 barg)
Operating Temperature
32 - 212 °F (0 -100 °C)
The RBI pH Sensor is designed for extended sensor life when used in applications with sulfides which are typically found in scrubbers.
- 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 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
