Process Analysis

pH indicates the acidic or alkaline condition of an aqueous solution and is one of the most widely monitored parameters in water treatment and industrial processes. ORP measures oxidation reduction potential and can provide useful information about the oxidising or reducing condition of a process. Typical applications include water treatment, wastewater treatment, chemical processes and industrial water monitoring. Probest provides pH and ORP sensors for both continuous and portable measurement.

Conductivity indicates the ability of water to conduct electrical current and is influenced by the concentration of dissolved ions. It is commonly monitored in water treatment, industrial process water, utilities and applications where changes in dissolved ionic content are significant. Sensor selection should consider the expected conductivity range, process chemistry, temperature and possible sensor fouling. Probest offers conductivity measurement within both individual and multi parameter water monitoring systems.

Dissolved oxygen measurement determines the concentration of oxygen present in water. It is particularly important in wastewater treatment, aeration processes, surface water monitoring and other biological or environmental applications. Optical fluorescence sensors provide one approach to dissolved oxygen measurement. Probest uses this principle in its digital dissolved oxygen sensors for applications including wastewater, surface water and industrial process water.

Turbidity indicates the optical effect of suspended material in water, while suspended solids measurement provides information about the concentration of solid material present. These measurements are important in water treatment, wastewater treatment, clarification processes and industrial effluent monitoring. The measurement location should be selected carefully because bubbles, fouling, solids distribution and process conditions can affect representative measurement. Probest provides both turbidity and suspended solids sensors for continuous and portable applications.

Chlorine measurement is important where disinfection performance or residual disinfectant concentration must be monitored. Applications can include drinking water treatment, water distribution and other water treatment processes. Different measurement principles may be used depending on the required parameter and application. Probest includes residual and total chlorine analysers using the DPD colorimetric method within its current water analysis range.

COD and BOD are widely used indicators of organic pollution and treatment performance in wastewater and industrial effluent applications. Continuous optical measurement can also be used to monitor changes in organic load. Probest offers UV based sensors that use absorption at 254 nm and can derive COD or BOD related values under defined conditions. The measurement method and correlation should therefore be understood when comparing continuous sensor readings with laboratory reference methods.

Ammonia nitrogen and nitrate measurement can support wastewater treatment, environmental monitoring and nutrient management. Ion selective electrode technology is one approach used for these parameters. Probest currently offers sensors for ammonia nitrogen, nitrate and other ions within its water monitoring portfolio.