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This section provides an overview for water quality sensors as well as their applications and principles. Also, please take a look at the list of 11 water quality sensor manufacturers and their company rankings. Here are the top-ranked water quality sensor companies as of April, 2025: 1.Sensorex, 2.Geotech Environmental Equipment, Inc., 3.Omega Engineering, Inc..
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A water quality sensor is a sensor used to measure water quality.
Major measurement items include pH (hydrogen ion concentration), ORP (oxygen reduction potential), DO (dissolved oxygen), and EC (electrical conductivity), etc. Not only single-item measurement sensors but also combined sensors are available. In addition to these items, there are also a variety of products that can measure water temperature, water level, water pressure, salinity, ammonia, turbidity, and other parameters.
Water quality sensors are mainly used by research institutes to measure water quality in rivers, lakes, marshes, and oceans; in agriculture to manage hydroponics, liquid fertilizer, and agricultural wastewater; and in factories to control wastewater.
In addition to surface water and groundwater measurements, the system also plays an important role in water quality inspections at aquaculture farms, where accurate water quality control is required. Water quality sensors are also used in the quality control of grey water, which is sometimes referred to as recycled water after it has been used for drinking water treatment.
Water quality sensors mainly measure pH (hydrogen ion concentration), ORP (oxygen reduction potential), DO (dissolved oxygen), and EC (electrical conductivity). Each of these items can be measured separately or as a combined sensor.
pH is the concentration of hydrogen ions. The glass electrode method is mainly used as the measurement method. The glass electrode method uses a glass electrode and a reference electrode to determine pH by measuring the potential difference (voltage) generated between the two electrodes.
River water generally has a pH of around 7, but since it varies depending on the location and conditions, it is considered a major parameter in water quality surveys.
ORP is the oxygen reduction potential. It is an indicator of the oxidizing or reducing potential of water and represents the potential determined by the balance between dissolved oxidized and reduced substances.
The measurement method is similar to that of pH measurement, using a pH meter body with an mV measurement function, a precious metal electrode (platinum or gold electrode), and a comparison electrode.
DO refers to dissolved oxygen. Dissolved oxygen indicates the amount of oxygen dissolved in water quality, a value that varies with temperature, salinity, and atmospheric pressure. Since living organisms in water consume the oxygen dissolved in the water to survive, it is used as one indicator of the ease of survival of living organisms.
Specific measurement methods include the titration method, diaphragm electrode method, and fluorescence method. In the fluorescence sensor, fluorescence is irradiated onto the sample, and the concentration of dissolved oxygen is calculated from the attenuation of transmitted light using the phenomenon of quenching by dissolved oxygen. In other words, the higher the concentration of dissolved oxygen, the stronger the quenching phenomenon and the lower the fluorescence detected by the detector.
EC is the electrical conductivity. Electrical conductivity is an indicator of the ease of conducting electricity in water. It is measured by passing electricity between electrodes immersed in a solution.
Pure water does not conduct electricity, but solutions with high levels of electrolytes in the water conduct electricity easily. An example of an electrolyte in water is nitrogen dissolved in wastewater.
There are two types of water quality sensors: those that are installed according to the application and portable types that can be carried around. The portable type consists of a stick-shaped sensor and an operating unit, such as an instrument monitor, connected by a cable.
The electrode is placed in the water and the values are read from the panel on the main unit. Because of the risk of dropping the device when used outdoors or in the field, many products are designed to be robust and easy to operate even with one hand. Also available are models that are highly adaptable to heat and have been developed to enable measurement in places with extreme temperature fluctuations.
*Including some distributors, etc.
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Sensorex is a manufacturer and supplier of water-quality sensors and instruments. Founded in 1972, the company is based in Garden Grove, California, USA. The company specializes in designing, producing, and distributing a wide range of water quality measurement solutions, including pH sensors, conductivity sensors, and dissolved oxygen sensors. Sensorex's products are widely used in industries such as water treatment, aquaculture, and industrial processes. Sensorex offers calibration and technical support services to ensure accurate and reliable measurements. The company serves applications such as municipal water and wastewater treatment, environmental monitoring, laboratory and analytical, and pool and spa.
Geotech Environmental Equipment, Inc., founded in 1978 in Denver, Colorado, USA, is a manufacturer of a diverse range of environmental monitoring and sampling equipment. The product line includes groundwater pumps, gas analyzers, soil sampling tools, and water quality testing instruments. These products offer benefits such as accurate data collection, easy field deployment, and optimal performance, aiding in environmental assessment and remediation efforts. These equipment find application in environmental consulting, geotechnical engineering, waste management, and regulatory compliance industries. The state-of-the-art technology provides advanced solutions for environmental monitoring and analysis, resulting in sustainable resource management and protection of ecosystems.
OMEGA Engineering Inc., founded in Norwalk, CT, in 1962 is a manufacturer of products used to measure temperature and humidity, flow and level, and pressure. The company's product portfolio includes thermocouple probes and assemblies, pressure gauges and switches, and air velocity measurement systems, wireless systems and portable optic sensors. The company serves markets including Automotive and Electric Vehicles, Renewable Energy and Energy Storage and Electronics and IT Infrastructure. The company also offers customer services that include support, custom research projects and customized services.
Inventive Systems, Inc. is a manufacturer of oil-in-water alarms & monitors, founded iin 1980, and located in Palm Beach, Florida. The company provides a range of oil-in-water detection solutions, including self-cleaning alarms for detecting oil in water, models that incorporate sample systems or probes for continuous measurement, portable handheld devices for quick assessment, and even an explosion-proof version for hazardous environments. These products play a critical role in various industries where the separation of oil and water is essential for environmental protection, safety, and process efficiency.
pHionics Inc., founded in Carson City, Nevada, in 1981 is a supplier of Water Quality Sensors for Environmental Monitoring and Process Control. The company's product portfolio includes Analog Sensors, Analog Transmitters, Noise Reduction, Isolated Transmitters, and 2-wire Transmitters. The company provides services including data analytics and integration services, custom research projects and customized services. The company serves industries such as Environmental Monitoring Agencies and Research Institutes, Water and Wastewater Treatment Plants and Aquaculture and Fisheries.
Tohkemy Corporation, established in 1963, and headquartered in Osaka, Japan, is a manufacturer that specializes in water processing machinery and equipment. The company's products include anthracite filter media, chemical pumps, and polymer dissolving units. It also provides water measuring equipment and Mixers. Its products are designed to purify all types of water, from drinking water to industrial-use applications. It serves the water treatment and environmental conservation industries and is classified under the industrial machinery manufacturing industry.
OPTEX CO., LTD., established in 1979 and based in Shiga, Japan, is a manufacturer and supplier of sensors and IoT technologies. The company's product portfolio includes access control systems, environmental sensors, IoT devices, people counting systems, and intruder detection sensors and systems. These systems have applications in various industries, including the security industry, environmental monitoring, parking facilities, water quality monitoring, and others. The company is ISO 9001 Quality Management System (QMS) and ISO 14001 Environmental Management System (EMS) certified.
Xeos Technologies Inc., established in 2004 and based in Dartmouth, Canada, is a manufacturer of telemetry and data collection products. Its manufactured products include iridium data telemetry, Argos satellite transmitters, LED flashers, RF beacons, and iridium VAR. Its products are utilized for subsurface mooring, oil spill tracking, and current tracking. It partnered with several brands, such as Bentos Servicios Equipos Marinos, Ems Systèmes De Monitorage, Flynn Technical Solutions, Otronix Co. Ltd., and Planet Ocean. The company was chosen by Canada’s National Facility for Seismic Imaging to help rebuild Canada’s ocean seismic capability.
Xi'an Desun Uniwill Electronic Technology Co. Ltd., established in 2019 and based in Xi'an, China, is a manufacturer of water quality sensors. It specializes in ammonia nitrogen, blue-green algae, salinity sensors, and solar power buoys for water quality monitoring, dissolved oxygen sensors, pH sensors, and dissolved oxygen. The company's products are utilized in several sectors, especially water environmental protection, sewage treatment, industrial process monitoring, aquaculture, and groundwater across several regions, including America, Asia, Europe, and the Middle East.
WoMaster is a manufacturer of industrial products. The company offers goods for critical applications such as railway, power and utility, intelligent transportation, and smart city surveillance. The company's R&D team owns critical IIOT hardware and software technologies. With full SMT, DIP, assembly, and test lines, the company EMS has produced industrial devices for more than 20 years. The company EMS passes ISO9001:2015 and ISO14001:2015 quality certificates. The company provides SW and HW (ASIC) integrated protection mechanisms that apply the latest application-specific integrated circuit (ASIC) secure technology.
PASCO Scientific, headquartered in the United States, is a supplier company of educational science solutions since 1964. The company's comprehensive product range includes science sensors, data loggers, and lab equipment, catering to different educational levels from K-12 to higher education. Hands-on science tools and datalogging solutions connect the students directly to science and STEM concepts with classroom technology such as sensors, interfaces, and data collection and analysis software. They also design and manufacture lab equipment for physics and engineering and offer curriculum solutions.
Ranking as of April 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Sensorex |
20.2%
|
| 2 | Omega Engineering, Inc. |
13.7%
|
| 3 | Geotech Environmental Equipment, Inc. |
13.4%
|
| 4 | Inventive Systems, Inc. |
10.6%
|
| 5 | pHionics Inc. |
10.4%
|
| 6 | PASCO |
8.5%
|
| 7 | OPTEX CO., LTD. |
6.5%
|
| 8 | Xeos Technologies Inc. |
5.6%
|
| 9 | Xi'an Desun Uniwill Electronic Technology Co., Ltd |
4.6%
|
| 10 | Tohkemy Corporation |
4.1%
|
Derivation Method
The ranking is calculated based on the click share within the water quality sensor page as of April 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
5 | 55.6% |
|
Japan
|
2 | 22.2% |
|
Canada
|
1 | 11.1% |
|
China
|
1 | 11.1% |
112 products found
112 products
iEnter Co., Ltd.
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The IoT water quality sensor is a system that can manage water quality data for land-based aquaculture, marine aquaculture, rivers, and ponds 24 ho...
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Yagyu Shokai Co., Ltd.
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■Features A reagent set for measuring water quality using a multi-item water quality meter or spectrophotometer.
Yagyu Shokai Co., Ltd.
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■Features - Calibration curves for over 70 items have been programmed for immediate measurement, and up to 4 items can be measured simultaneously. ...
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■Features - A glass tube with an outer diameter of approximately 4 mm is filled with a detection agent that has adsorbed a reaction reagent. - Can ...
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■Features ・The color comparison is displayed as an actual value using a device rather than visually. Items marked with * are sets that include tes...
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The WD100 series consists of multiple measurement units and a communication control server.The measurement unit is IP67 waterproof, so the main bod...
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Waterproof ORP meter ORP-1000PE ■Features - IP67 dustproof and waterproof. - "Auto lock function" holds the measured value after it stabilizes. ・...
A-Gas Japan Co., Ltd.
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■Features ・One unit can measure pH, conductivity, TDS, salinity, ORP (electrode sold separately), and temperature. ・It is safe because it has IP-...
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■Specifications Required equipment: COD, COD (high concentration), total nitrogen (low concentration), total nitrogen (high concentration) / adapte...
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■Applications/Features ・High spatial resolution ・Fast response time from several hundred milliseconds to more than ten seconds ・Very low sample ...
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■N2O sensor head for wastewater treatment plants – measurement of dissolved N2O The N2O sensor for wastewater treatment plants is a Clark-type elec...
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■Summary pH value is an important parameter in many biological processes. There are not many processes in which the pH value does not play a major ...
Central Scientific Trading Co., Ltd.
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■Summary Biological processes are becoming increasingly important in biotechnology and pharmaceutical industries. Due to the diversity of organisms...
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■DCO2 (dissolved carbon dioxide) sensor Dissolved carbon dioxide (DCO2) is a critical process parameter (CPP) in biopharmaceutical manufacturing pr...
