pH Measurement in Deinking Mills
Accurately measure pH levels within the pulp & paper industry
pH Sensor Resists Coating & Reference Poisoning
Removing ink from recycled paper and turning it into raw pulp to make new paper is an involved process. pH is a critical parameter that influences ink removal efficiency. pH measurements in deinking mills can be difficult because of the varied nature of the raw material and thick consistency of the pulp. Sensors used in this environment must be rugged and chemically resistant. Many pH sensors will require regular daily or weekly cleaning. The Rosemount™ 396R Retractable pH Sensor is well suited to this type of application. The wide-area reference junction provides resistance to coating while the patented helical pathway prevents process intrusion into the inner reference chamber.
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Product Solutions
The Rosemount 396R pH Sensor / ORP Sensor, with integral cable, is specifically designed for improved life in harsh, dirty applications where a separate sample stream is difficult to provide and greater insertion depths are required. This pH/ORP sensor is designed for use with a 1-1/4 in. or 1-1/2 in. ball valve for tap installation.
- Minimum maintenance due to robust reference technology helps ensure a steady signal when pH sensor / ORP sensor is coated
- Retractable design for use with ball valve assemblies
- Versatile mounting options feature either a 21" or 3" titanium tube sensor length
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)
Max Operating Pressure
(at retraction or insertion)
21 in. tube 64 psig (4.41 barg)
36 in. tube 35 psig (2.41 barg)
21 in. tube 64 psig (4.41 barg)
36 in. tube 35 psig (2.41 barg)
The Rosemount 5081 Explosion-Proof Transmitter is a single channel loop powered device that can accept input from a variety of liquid analysis sensors including: pH/ORP sensors, conductivity sensors (contacting and toroidal) and amperometric sensors (dissolved oxygen, chlorine and ozone). The transmitter features a rugged, weatherproof, corrosion-resistant enclosure to withstand harsh environments.
- Robust explosion-proof design constructed with heavy duty cast aluminum
- Faster installation using Quick Start programming
- Intrinsically safe, non-incendive, and explosion-proof hazardous area location approvals
Measurement Range
Varies by sensor type. See Product Data Sheet for details.
Operating Temperature
-4 - 149 °F (-20 - 65 °C)
Power Supply
Minimum power supply voltage is 12 Vdc. Maximum power supply voltage is 42.4 Vdc (30 Vdc for intrinsically safe operation). Power supply voltage should cover the voltage drop on the cable plus the external load resistor required for HART® communications (250 Ω minimum).
