Sensors & Transducers


Tough sensor for low maintenance and maximum life

September 2000 Sensors & Transducers

Rosemount Analytical is offering its TUpH model 398 pH/ORP insertion/submersion sensor, one of the toughest sensors Uniloc has ever built. The model 398, the newest member of the TUpH family of sensors, uses the highest quality materials and the patented proven TUpH reference technology to provide maximum sensor life and ensure low maintenance in the harshest, dirtiest conditions.

The chemical-resistant construction of Tefzel2, titanium and the patented reference makes the model 398 a good sensor for tackling the most aggressive applications, such as those used in the pulp and paper industry. This unique construction not only stands up to the harshest chemicals, like chlorine dioxide used in bleaching towers, but it also resists other organic solvents and oxidising agents. The sensor can be tailor made with either Kalrez2 or Viton2 seals, depending on the particular process requirement. The insertion/submersion design allows for variable insertion depths and simple sensor removal without cable twisting.

The model 398 Sensor with the industry-proven TUpH technology practically eliminates drifting pH readings, a common problem for sensors in dirty, harsh processes that can coat reference junctions. The model 398 sensor, with its Tefzel reference junction, resists plugging because the sensor's junction pores are 10 to 15 times smaller than the average pore size of most other manu-facturers' sensor junctions. The larger porous reference junctions will plug and cause a noisy, drifting pH reading and result in increased maintenance. With the model 398 the particles do not block the smaller pores and a steadier and more accurate pH reading is made possible, with fewer calibrations. The sensor's Accuglass pH bulb also resists cracking and has theoretically near-perfect response even at extreme pH values.



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