pH/ORP

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Why measuring pH?

pH is the most important most frequently measured value in aqueous solutions. Roughly speaking pH defines if a solution is acid, neutral or alkaline. It is bases on the dissociation of the water molecule H2O ⇔ H+ OH- and describes the activity of the hydrogen ion. The scale it includes according to the definition 14 orders of magnitude from 0 to 14. Solutions between 0 and 7 are acid, exactly at 7 they are neutral, between 7 and 14 alkaline. The smaller the pH the higher the activity of the hydrogen ions and vice versa. In practice values between -1 and 15 can be measured.

The sensor for pH is the so-called pH electrode, consisting of a measuring electrode and a reference. The measuring electrode consists of a special glass sensitive for hydrogen ions. It is filled with a buffer solution with pH 7. Immersing the electrode into a sample leads to change of the potential of the measuring electrode in comparison to the reference. This change will be detected by appropriate instruments and converted tot eh pH reading.
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Xylem Analytics pH/Redox-Messung im LaborORP

Why measuring ORP?

The measurement of the oxidation/reduction potential (ORP) is based on reactions taking place in aqueous solutions, where the reactants exchange electrons. The uptake of electrons by one reactant is called reduction, the donation of electrons by the other oxidation.

An ORP electrode makes this reaction visible. It consists of an inert precious metal electrode (gold, platinum) and a reference electrode. The reaction of the reactants on the metal surface causes an electrical potential in comparison to the reference electrode which can be detected by appropriate meters. A typical application in practice is the monitoring of the efficiency of a disinfectant dissolved in water like chlorine. The potential of an ORP electrode will always be noted considering the reference system used (typically Ag/AgCl). If the conversion into the potential versus a hydrogen electrode is required a temperature dependent potential has to be added (e.g. 207 mV at 25 °C).

Portable pH Meters

Portable pH Meters

Reliable, waterproof, rugged: mobile pH measurement at any places. All meters also measure ORP 

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pH Benchtop Meters

pH Benchtop Meters

Lab analytics, quality control etc.: pH benchtop meters support multiple applications, also ORP measurement 

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pH and ORP Electrodes

pH and ORP Electrodes

For each requirement a fitting electrode! 

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pH and ORP Electrodes for Process Analytics

pH and ORP Electrodes for Process Analytics

Experts for industrial in-line applications 

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pH/ORP in Wastewater

pH/ORP in Wastewater

Digital sensors for the IQ Sensor Net 

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IQ SENSOR NET

IQ SENSOR NET

Measuring system for every wastewater treatment plant for up to 20 parameters, including pH/ORP. 

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pH/ORP in Drinking Water

pH/ORP in Drinking Water

Analoge systems for the monitoring of drinking water 

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Titrator TitroLine<sup>®</sup> 7000

Titrator TitroLine® 7000

To titrate pH 

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