Potential Matching Pin In many industrial applications, especially in plating baths, grounding loop current is a very common problem. When a traditional electrode/controller system is used with the electrode reference connected both to the electrode and to the instrument, a current flow occurs through the reference half cell, causing fluctuations in reading and serious damage to the Ag/AgCl element. The potential matching pin shields the reference from external electrical fields. Shown above, the matching pin allows the measurement to stabilize and ensures effective process regulation. In order to function properly, the matching pin has to be continuously immersed in the measured solution and for this reason is placed near the electrode junction. Temperature Effect Sample temperature is an important parameter for solutions with a pH different from 7.0. In fact at pH 7.0, temperature compensation is not required. Due to a built-in temperature sensor, there is only one electrode to install. Also due to its proximity to the pH sensor, the built-in temperature sensor ensures fast, accurately compensated readings even during sudden temperature fluctuations. A Specific Electrode for Each Application The table to the right lists the most common industrial applications with the corresponding, recommended Hanna electrodes. For each application, several models are available, with different options for the following characteristics: • Electrode dimensions • Connection type • Installation requirement • Optional configurations (matching pin, Pt100 or Pt1000 sensor) Hanna produces a wide range of industrial electrodes, for any specific application need. Matching Pin Flat Tip Electrode Common Industrial Applications Application pH Electrode Series Code Domestic Wastewater Sewage, Septic Tank Treatment easy HI1090B/5 Industrial Wastewater flat tip HI1006-2005 HI1000 HI1003/5 easy HI1210B/5 Food Industry (Beer, Jam, Diary Products) flat tip HI1006-2005 easy HI1090B/5 Chemical Neutralization flat tip HI1006-2005 easy HI1210B/5 Potable Water (>400µS/cm) flat tip HI1006-2005 HI1000 HI1001 easy HI1210B/5 Cooling Towers AmpHel HI6291005 HI1000 HI1002/5 easy HI1210B/5 Water Softening flat tip HI1006-2005 AmpHel HI6291005 HI1000 HI1001/5, HI1002/5 easy HI1210B/5 Demineralization flat tip HI1006-2005 easy HI1090B/5 Low Conductivity Solutions flat tip HI1006-2005 Swimming Pools flast tip HI1006-2005 Sea Water easy HI1090B/5 Galvanic Baths flat tip HI1006-3005 AmpHel HI8299505 HI1000 HI1003/5 easy HI1210B/5 Sugar Industry, Paper Industry flat tip HI1006-2005 easy HI1090B/5 Textile Industry, Tanneries flat tip HI1006-3005 AmpHel HI8299505 Acid Samples with Fluoride Ions flat tip HI1006-4005 Application ORP Electrode Series CODE Oxidation of Cyanide and Nitrite flat tip HI2004-2005 Ozonization & Oxidant Products AmpHel HI6493005 Reductant Products (Chromate Reduction) AmpHel HI6293005 HI2000 HI2003/5 easy HI3210B/5 Swimming Pools HI2000 HI2001, HI2003/5 easy HI3210B/5 Electrodes Designed and Manufactured by Hanna Process Electrodes 15 Process Instrumentation 15.116 | www.hannainst.com electrodes
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