Rugged — Broadley-James sensors have been used and tested for more than a decade in the pulp and paper industry under conditions involving strong caustics, high temperatures, and harsh industrial environments. The ST977, ST864, and ST951 are rugged, sealed sensor assemblies designed specifically for in-line applications in pulp and paper mills and related chloralkali plants.

Reliable — A good control system provides repeatability to the paper mill operator. It is their knowledge that produces quality paper. The reliable sensor, however, allows them to consistently do this over and over again, with confidence. The DynaProbe’s® unique design offers distinct advantages which allow for a longer lifespan with less maintenance.

Pulp & Paper Brochure.pdf

Extreme Pressure Assembly

This pH sensor and housing assembly is designed specifically for pulp stock applications involving extreme pressures up to 300 psig, elevated temperatures up to 140¾C, and elevated pH levels. A Pt 1000 temperature compensator is built in to the pH sensor.

Part Number:
ST864-R33H-E07FF Extreme Pressure
pH Range 0–14 pH
Temperature Range 0–140¾C
Pressure Rating 300 psig @ 140¾C
Reference System Ag/AgCl
Glass Membrane Type HT-3, Low Sodium Ion error
Wetted Materials Kynar®, Teflon®, Glass & 316 Stainless Steel

Sensor ST864 Specifications

High Pressure Hot-Tap Assembly

The pH sensor and housing assembly shown below is used in the majority of measurement points throughout the pulp and paper mill. The sensor can be inserted into, and retracted from, the process without turning off the flow in the pipe. A built-in Pt 1000 temperature compensator is standard, as is the integral solution ground connection. Typical applications include pH monitoring and control of residual bleach, white liquor, spent acid, black liquor, cationic dyes and pulp stock.

Part Number:
ST977-R33H-N07FF High Pressure
pH Range 0–14 pH
Temperature Range 0–120¾C
Pressure Rating 100 psig @ 90¾C
Reference System Ag/AgCl
Glass Membrane Type HT-3, Low Sodium Ion error
Wetted Materials Ryton®, Teflon®, Glass & Viton® O-rings

Twist-Lock Assembly

These high quality sensors are constructed of corrosion-resistant wetted materials including Ryton®, Teflon® and glass. The large annular junction resists fouling. Also, the sealed, double-junction reference electrode is highly resistant to poisoning. Includes built-in temperature compensation, built-in solution ground, custom cable lengths and choice of cable connectors.A good control system provides repeatability. These reliable sensors allows consistency, over and over again.

Part Number:
ST951-R33H-N07FF Twist-Lock
pH Range 0–14 pH
Temperature Range 0–120¾C
Pressure Rating 50 psig @ 120¾C
Reference System Ag/AgCl
Glass Membrane Type HT-3, Low Sodium Ion error
Wetted Materials Ryton®, Teflon®, Glass & Viton® O-rings

Long-lasting — The solid state reference cell features the unique patented IonTrap™ design for extended service life in the most severe applications. The body is molded from chemical-resistant, conductive Ryton® or Kynar® and the reference junction is porous Teflon®. A built-in Pt 1000 temperature compensator is standard in all sensors, as is the integral solution ground connection in the ST977 and ST951.

Compatible — Broadley-James’ industry standard designs are compatible with most existing hardware in the pulp and paper industry. In addition, the pH sensors can be used with the majority of electronics and controllers on the market.