Online analyzers

FILTER empowers water quality professionals across the world to do their best work.

Find industry-leading online analyzers and software tools here. We offer a diverse selection of HACH laboratory and field analyzers suitable for various applications, enabling you to select the appropriate tool for your specific requirements.

Our analyzers are user-friendly and easy to operate, crafted to deliver precise and dependable results, empowering you to make well-informed decisions based on accurate data.

  • Accuracy
  • Ease of use
  • Versatility
  • Durability
  • Support

Water quality excellence across diverse sectors

HACH lab instruments and analyzers are used by a variety of industries and organizations that need to analyze water (or other process) quality. These can include water treatment plants, environmental agencies, food and beverage companies, pharmaceutical companies, and research institutions, among others. These instruments are essential for ensuring that water is safe for consumption, meets regulatory standards, and is suitable for various industrial processes.

By providing constant, accurate and reliable data online on water quality, HACH analyzers help these organizations make informed decisions and take appropriate actions to maintain high water quality standards. Instead of single manual samples, analyzers offer to possibility of real quick, easy and hassle-free results of water quality. With continuous monitoring from analyzers, you can detect trends and identify potential issues – before they become problems. A specific analyzer is selected based on your process needs.

In the water world you can analyze basically everything – here is just some possible options listed. If you find out more, contact our specialist!

The product images are for illustrative purposes, and the actual product may appear different from the one shown in the pictures.
Please note: Product selection may vary in different countries where we operate. 


  • TOC analyzers

    A total organic carbon (TOC) analyzer is an analytical online instrument that measures the total amount of organic carbon contained in water. It can br used for quality control of public drinking or waste water, control and evaluation of pharmaceutical, dairy and food manufacturing processes, and a wide variety of other applications.​ They are designed to run a discontinuous analysis on Total Organic Carbon or Total Carbon levels, reducing significantly reagent consumption but also overall maintenance costs. Additionally a rinsing or cleaning cycle can be introduced to eliminate cross-contamination and fouling.


    • Options for TOC or TC analysis
    • Discontinuous analysis with programmable frequency
    • Smart automatic features
    • Control and communication via industrial panel PC
    • Standard 4 – 20 mA signal output with alarm processing
    • Communication ports supporting connectivity to Modbus
    • Multiple stream analysis
  • Turbidity analyzers

    Online turbidity analyzers are used to measure turbidity of liquids by controlling if a sample is proportional to the intensity of the light reflected by particles in the water. Turbidity is a measure of cloudiness in liquids and has been recognized as a simple indicator of general water quality. The exact type of turbidity analyzers will be chosen based on your application and process.

    Our selections of analyzers vary from Ultraturbo Seawater sensor to Ultra-High Precision Low Range Laser turbidity analyzers. Applications for online turbidity analyzers can be for an example filtration, membrane protection, regulations, water reuse and many more.


  • Chlorine analyzers

    Chlorine analyzers have been in the industry standard for years, known for providing real-time accurate and reliable results. Free Chlorine Analyzer and Total Chlorine Analyzer measure free or total chlorine continuously for real time process control. It can be based on amperometric or colorimetric  technology.

    Applications for this can be boiler water, discharge water, product loss, groundwater, potable water influent for wastewater, membrane protection, filtration,  municipal water, regulations, surface water and many more.

    Amperometric chlorine technology does not use reagents, eliminating the need for a sanitary drain and saving you the cost of monthly reagent replacement.

  • EZ series analyzers

    Complete solutions for the complete water cycle – measure new and unique parameters in a variety of measuring ranges. Risk mitigation, compliance, safety and process uptime: these are common requirements in water management in every industry. The EZ Series Online Analyzers from Hach® provide a solution for continuously monitoring parameters that are critical to these concerns. The EZ Series Online Analyzers include new and unique parameters, numerous measurement ranges and provide data 24/7 – so you can make faster decisions.

    All instruments come in the same rugged mainframe with a compact footprint and a common user interface on industrial panel PCs, keeping training efforts low. With continuous monitoring from EZ Series analyzers, you can detect trends and identify potential issues – before they become problems.

    Featured parameters:

    • Adenosine triphosphate (ATP)
    • Alkalinity & hardness
    • Fluoride
    • Iron
    • Manganese
    • Total Nitrogen and Total Phosphorus (TN & TP)
    • Toxicity
    • Volatile Fatty Acids (VFA)
  • Beverage analyzers

    Beverage Analyzer and Soft Drink Oxygen Analyzer are the ideal solutions for final beverage packages analysis. We offer the latest technology in final package analysis for measurements of Total Package Oxygen, Headspace Oxygen and Dissolved Oxygen; as well as dissolved Carbon Dioxide and Headspace Volume. It has been designed to meet the practical needs of both lab and at-line environments.

    The high-quality touch-screen facilitates measurement customization on all types and sizes of cans or bottles, as well as providing critical information on the health of the instrument. Utilization of this instrument has been proven to provide critical quality information of the final package, increasing process control and beverage quality.

  • Silica analyzers

    Silica analyzers are instruments used to measure the concentration of silica (silicon dioxide, SiO2) in liquid samples. They are commonly employed in industries such as power generation, semiconductor manufacturing, and water treatment, where monitoring silica levels is essential for process control, quality assurance, and environmental compliance.

    Silica analyzers typically utilize various analytical techniques to quantify silica concentrations, including colorimetry, ultraviolet (UV) absorption, and chemical reactions specific to silica.

  • Colorimetric chlorine analyzers

    Colorimetric chlorine analyzers are instruments used to measure the concentration of chlorine (Cl2) in liquid samples by employing colorimetric principles. These analyzers typically operate based on a chemical reaction between chlorine and a colorimetric reagent, resulting in a color change proportional to the chlorine concentration. A photometric detector, such as a photodiode or a photomultiplier tube, is utilized to measure the intensity of the color change.

    This type of analyzer is essential for various applications where accurate monitoring of chlorine levels is critical for safety, quality control, and regulatory compliance, including water treatment applications, industrial processes, and environmental monitoring.

  • Ozone analyzers

    Smart amperometric Ozone Analyzers are online, single-channel industrial sensors that measure ozone in drinking water treatment plants, distribution networks, and other applications that require monitoring of ozone at the ppb and ppm levels. These instruments use an amperometric method to measure ozone concentration. A membrane allows the selective diffusion of ozone molecules to the amperometric sensors. The measurements are compensated for pH and temperature.


    • Discharge
    • Groundwater
    • Influent for wastewater
    • Membrane protection
    • Municipal water
    • Regulations
    • Surface water
  • Oxygen scavenger analyzers

    Online analyzers for monitoring hydrazine and carbohydrazide oxygen scavengers are integral parts of complete water analytics systems designed for the power industry. A broad range of product options is made to work together as flexible solutions to meet your unique needs.

    Oxygen scavenger analyzers are used in various industries where the presence of dissolved oxygen in liquids can cause corrosion, degradation of products, or interfere with processes.

    Some common applications include:

    • Boiler water treatment
    • Food and beverage industry
    • Pharmaceutical and biotechnology
    • Oil and gas industry
    • Water treatment and many more.
  • Phosphate analyzers

    Phosphate Analyzers are continuous online analyzers used to measure the concentration of phosphate ions (PO₄³⁻). They are employed to early detect and precisely monitor phosphate levels in various applications, including boiler water supply, steam cycles, municipal wastewater effluents, and many others.

  • Streaming current monitors

    Streaming Current Monitors (SCMs) are instruments used in water treatment processes to measure the streaming current generated by charged particles suspended or dissolved in a liquid. They are primarily employed in coagulation and flocculation control in water and wastewater treatment plants.

    SCMs operate based on the principle of electrokinetic charge detection. When charged particles, such as colloids, organic matter, or ions, are present in water, they create an electric potential at the surface of a sensing electrode. This potential generates a streaming current as the charged particles move past the electrode. The magnitude of the streaming current is directly proportional to the concentration of charged particles in the water.


    • Water management and surface water
    • Coagulation and flocculation control
    • Turbidity and particle monitoring
    • Process optimization
    • Research and development
  • Testomat hardness analyzers

    The Testomat automatic determines residual/total hardness via titration. It is ideal for assessing water quality after water softeners, water blending, and drinking water plants. These compactly designed online analyzers are primarily used for measuring water hardness and alkalinity parameters such as carbonate hardness, m-value, or p-value.

    These robust, field-proof devices allow operators to monitor two measuring points and thus two plant areas. The measured values can be transmitted to a higher-level control system via a 4-20 mA signal. Additionally, two limit values can be monitored using potential-free contacts. The evaluation of the titration methods employed is performed photometrically by observing the color changes of the reagents in the optically visible wavelength range.

5 reasons you need our lab instruments

  • illustration Accurate analysis

    Laboratory equipment facilitates precise and reliable analysis of substances and materials. Instruments such as spectrophotometers, chromatographs, and mass spectrometers provide accurate measurements, enabling researchers to characterize compounds, detect contaminants, and analyze complex mixtures.

  • illustration Research and development

    Laboratory equipment supports research and development activities across various fields, including pharmaceuticals, materials science, biotechnology, and environmental science. Specialized equipment allows scientists to explore new materials, develop innovative products, and advance scientific knowledge.

  • illustration Quality assurance

    In industries such as food and beverage, pharmaceuticals, and manufacturing, laboratory equipment is vital for quality assurance and quality control processes. Instruments such as pH meters, titrators, and viscometers help ensure that products meet regulatory standards, specifications, and customer expectations.

  • illustration Diagnostic testing

    Medical laboratories rely on a wide range of equipment for diagnostic testing and patient care. Analyzers for blood chemistry, hematology, microbiology, and molecular diagnostics enable healthcare professionals to diagnose diseases, monitor patient health, and guide treatment decisions.

  • illustration Education and training

    Laboratory equipment is essential for hands-on learning and practical training in academic institutions. Students studying science, engineering, and healthcare disciplines use laboratory equipment to conduct experiments, learn techniques, and develop critical thinking and problem-solving skills.


Our products provide peace of mind for any industry

Our mission – to ensure water quality for people around the world – inspires our research and development, powers our instruments, and underlies our chemistries and software. But our determination to provide clean, safe water to those who need it goes above science and beyond business.

We believe that everyone deserves clean water, and we’re making waves to make it happen!

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