Emerson Process Management

Oct. 30, 2007
PH/ORP Sensor Suits Broad Range of Processing Applications

Emerson Process Management on Oct. 24 introduced the Rosemount Analytical PERpH-X 3500 high-performance pH and ORP sensor, a general-purpose pH sensor that includes advanced technologies for difficult processing applications.

PERpH-X 3500 incorporates several design innovations for prolonged life, including  pH glass electrode durability, and increased reference electrode stability and mechanical design reliability.

The PERpH-X sensor family features a double junction electrode that excels in harsh applications, and the specially designed porous Teflon liquid junction has a large surface area to maintain a steady reference signal in dirty and fouling applications. The large surface area and high porosity attempt to minimize junction potentials leading to accurate measurements without standardization.

The porous Teflon reference junction is easily replaced if it becomes fouled or plugged. The potassium-chloride-based reference electrolyte is a chemically inert viscous gel that is unaffected by thermal or pressure cycling. With the junction removed, the outer reference electrolyte can be recharged using a gel-filled syringe supplied in the various solutions kits available as an accessory. Replacing a clogged junction or recharging the electrolyte will rejuvenate most failed sensors. Proper preventative maintenance can dramatically extend the life of the sensor by minimizing the depletion or poisoning of the primary reference.

The available Solution Kits optimize the PERpH-X 3500 performance by keeping the porous Teflon reference from coating and the electrolyte from fouling. Six solutions are available as electrolyte kits: high-temperature; bio-film-resistant; poisoning-resistant; oil-resistant; scaling-resistant; metals-resistant. Each kit contains a treated porous Teflon reference junction and a specially formulated electrolyte to extend the life of the reference electrode in its targeted application.

In addition, the AccuGlass pH glass electrode provides resistance to thermal and caustic degradation. The PERpH-X 3500 provides response for pH measurement, even at extreme values, and minimal hysteresis, and is designed with a removable, slotted tip that protects the glass bulb from direct impacts while in service and during calibration. The sensor is also fitted with a molded Ryton body and EPDM, Viton or Kalrez o-rings.

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