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Process Liquid Analysers are inline and online instruments that continuously measure physical and chemical properties of liquids flowing through industrial, water and wastewater processes. Using electrochemical, optical, spectroscopic or plasma-based sensing technologies, they monitor parameters such as pH/ORP, conductivity, dissolved oxygen, turbidity, chlorine, and elemental or trace-metal composition in real time. The hardware typically comprises sensors or probes, flow cells or sample-handling systems, and transmitters that output measurement data to control systems, enabling 24/7 unattended monitoring of process streams, effluent discharge, and feedstock or product solutions across industries like water treatment, mining, chemicals and battery materials.
These analysers eliminate reliance on slow, manual laboratory sampling by providing continuous, real-time visibility into liquid composition and quality, enabling faster detection of process deviations, contamination, or impurity excursions. They support regulatory effluent compliance, dosing and treatment chemical optimization, product quality assurance, and yield improvement in recovery processes such as flotation or metal purification. By automating measurement and integrating with control and monitoring systems, they reduce downtime, waste, and operator workload while improving safety, resource recovery, and operational efficiency across water/wastewater, mining, chemical and industrial processing applications.
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by Yokogawa
Line of process liquid analyzers, sensors and transmitters for continuous monitoring of pH/ORP, conductivity, dissolved oxygen, turbidity, chlorine, MLSS, density and wet chemistry parameters in industrial and water/wastewater processes.

by Xylem
WTW IQ Sensor Net is a modular multi-parameter online water quality measurement system with digital sensors, controllers and analyzers, and YSI EXO is a multiparameter sonde platform with interchangeable smart sensors for continuous water quality monitoring.

by Emerson

by Emerson
Multi-parameter liquid analysis transmitter with single or dual sensor inputs, supporting pH/ORP, conductivity, chlorine, dissolved oxygen, ozone and turbidity measurements for industrial, commercial and municipal applications.

by Endress
Memosens digital sensors paired with the Liquiline CM44x multichannel transmitter platform for continuous inline liquid analysis (pH/ORP, conductivity, oxygen, turbidity, chlorine, ammonium, nitrate and more). Memosens converts measured values to digital signals transmitted inductively to the transmitter, with automatic sensor recognition and plug & play exchange of pre-calibrated sensors.
by Metrohm
Compact single-method process analyzers (2026 pH, 2026 Titrolyzer, 2029 Photometer, plus HD versions) for chemical, water and wastewater monitoring.
by Metrohm
Versatile wet-chemical analyzer in potentiometric, photometric and thermometric versions with optional pH and conductivity, for 24/7 online monitoring of industrial processes and wastewater.
by Metrohm
Modular multi-cabinet process analyzer platform for 24/7 online monitoring of chemical, industrial, water and wastewater streams, supporting titration, pH, ion chromatography, NIR/Raman and XRF with sample conditioning and IMPACT software.
by Mettler Toledo
In-line digital Intelligent Sensor Management (ISM) sensors paired with the M800 multi-parameter transmitter, which monitors one, two or four sensors for pH/ORP, dissolved oxygen, conductivity, CO2 and turbidity in process applications. ISM adds predictive diagnostics, Plug and Measure startup and dynamic sensor lifetime status.
by SCHMIDT + HAENSCH
Compact inline process refractometer for continuous real-time measurement of liquid concentration (Brix, RI, etc.) directly in the production process, with analog and digital outputs.
by Xylem Analytics Germany (WTW)
Modular digital multi-parameter process measurement system for up to 20 sensors, combining digital IQ sensors (D.O., pH/ORP, conductivity, turbidity, nitrogen, carbon, phosphate, sludge level, color) with controllers and modules for wastewater and industrial process monitoring.
by JUMO
Modular multichannel measuring and control device for liquid analysis, measuring pH/redox, conductivity, temperature, disinfection parameters (chlorine, chlorine dioxide, ozone, hydrogen peroxide, peracetic acid) and flow rate.
by Hach
Kit pairing the LDO sc Model 2 luminescent optical dissolved oxygen probe with the Claros-enabled multi-parameter SC4500 controller for continuous process monitoring of dissolved oxygen and aeration control.