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This section provides an overview for oxygen monitors as well as their applications and principles. Also, please take a look at the list of 20 oxygen monitor manufacturers and their company rankings. Here are the top-ranked oxygen monitor companies as of April, 2025: 1.Cleatech LLC, 2.Fluid Aire Dynamics, 3.PureAire Monitoring Systems, Inc..
Table of Contents
An oxygen monitor is a measuring instrument used to determine the concentration of oxygen in the air.
It is sometimes called an oxygen sensor or an oxygen meter. Oxygen monitors are needed because oxygen is an essential substance for human life.
Monitoring oxygen levels is extremely important, especially in confined work benches that are prone to oxygen deprivation. In addition, many scientific and industrial fields require accurate oxygen concentration control in terms of process control and equipment maintenance. Depending on the requirements of the scientific and industrial sectors, measurement systems are available for a variety of measurement conditions.
Typical examples include zirconia sensors, which are used for product control in semiconductor manufacturing, energy conservation in automobiles, and exhaust gas purification. For more information on oxygen monitors, please refer to the figure below.
Uses of oxygen monitors can be broadly classified into two categories: "for prevention of oxygen deprivation" and "for oxygen concentration control."
Oxygen monitoring plays an extremely important role in maintaining vital activities in enclosed spaces. This is because it is said that if the oxygen concentration falls below 15%, a person will have difficulty breathing. If it falls below 7%, brain function will be impaired, and if it falls below 4%, death will occur. The equipment can be portable or wall-mounted.
In some industrial heat treatment processes in the chemical industry, ceramics, metals, etc., oxygen concentration must be kept low. The combustion process in industrial furnaces also requires monitoring and control of oxygen concentration to optimize combustion efficiency and the oxidation-reduction process.
Oxygen monitors for such industrial applications can be exposed to intense chemical reactions in high-temperature environments. Products that are resistant to harsh environments are required.
The two main operating principles of oxygen monitors are the "galvanic cell type" and the "zirconia solid electrolyte type." Other types include "magnetic type" and "wavelength tunable semiconductor laser spectroscopy type.
The galvanic cell consists of a resin membrane that allows oxygen from the outside world to pass through, gold (Au) and lead (Pb) electrodes, and an electrolyte (potassium hydroxide solution). The following reactions take place at each electrode:
Electrons emitted at the anode reach the cathode, where oxygen taken in from the air takes up the electrons emitted at the anode. Since the flow of electrons (current) is proportional to the oxygen concentration, the oxygen concentration can be measured by measuring the current. Since this reaction occurs spontaneously, no power supply is required to drive the sensor.
This method uses a zirconia cell, taking advantage of the fact that zirconia exhibits the properties of a solid electrolyte at temperatures of 500°C or higher. Zirconia can conduct oxygen negative ions (O2-) in a solid state, and the ions are conducted from a gas with high oxygen concentration (in the air) to an atmosphere with low oxygen concentration (in an industrial furnace, for example).
This ionic conduction generates a potential difference, and electrodes are placed on the high O2 concentration side and the low O2 concentration side, respectively, generating an electromotive force. The relationship is just like the positive and negative electrodes of a battery.
The electromotive force generated between the electrodes obeys the Nernst equation (see below), so the partial pressure of oxygen at each electrode can be determined.
Temperature is measured by thermocouples attached to the zirconia. In an atmosphere of approximately 400°C or lower, the target gas is introduced into the device via a sampling tube, and the zirconia cell is heated to a predetermined temperature by a platinum heater or other means (sampling method). This is because zirconia requires a temperature of 500°C or higher to function as a solid electrolyte.
Different products should be used for oxygen meters intended to prevent oxygen deprivation and those intended to maintain low oxygen concentrations in industrial processes.
Portable and stationary oxygen analyzers designed to prevent oxygen deficiency use galvanic battery-powered oxygen analyzers. This type does not require a power supply to drive the sensor.
The life of the sensor is approximately 2 to 3 years. However, the usable environment is limited to an atmosphere similar to the general environment, and the accuracy is about ±0.5%O2. The instruments are available in portable and wall-mounted types, and some are explosion-proof.
Zirconia type oxygen monitors are suitable for measuring oxygen concentration in high-temperature industrial processes such as industrial furnaces, etc. In atmospheres above 700°C, the direct insertion type is used, where the sensor part is inserted directly into the atmosphere.
For temperatures below 400°C, the sampling method is appropriate, whereby the ambient gas in the furnace is drawn in through a sampling tube, etc., and the zirconia cell is heated separately. The correct choice should be made according to the application.
*Including some distributors, etc.
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PureAire Monitoring Systems, Inc. is an American ISO certified manufacturer of gas monitoring systems founded in 1997 and based in Lake Zurich, Illinois. They produce oxygen deficiency monitors, combustible gas monitors, carbon dioxide and monoxide monitors, toxic gas detectors, and trace oxygen analyzers. Their systems have applications in semiconductor, biotechnology, agriculture, cryogenic, and pharmaceutical industries and have been used by numerous universities and notable companies and organizations such as Abbott Pharmaceuticals, Lockheed Martin, 3M, Xerox Corporation, and NASA.
The Titus Company was founded in 1986 and is based in Morgantown, Pennsylvania. The Titus Company provides expertise for compressed air solutions for private companies in manufacturing, concrete, and chemical applications as well as government institutions such as the Royal Navy. Product offerings include blowers & vacuum products, chillers & coolers, compressors, dehydrators, dryers, dust collection equipment, energy management tools, filters, gas generators, pumps, and accessories. The Titus Company also offers maintenance, service, repair, system analysis, system dieting, monitoring, as well as installation services.
Oxigraf, Inc., founded in Sunnyvale, CA, in 1996 is a manufacturer of laser absorption spectroscopy sensors for oxygen gas measurement and analysis. The company's product portfolio includes Oxygen Sensors, Oxygen Analyzers, Oxygen Deficiency Monitors, Cardio-Pulmonary Exercise Test Analyzer and Aerospace Oxygen Analyzers. Their products find applications in the fields of healthcare, research, process control, manufacturing, and aerospace. The company provides services such as Product Selection Guidance, Engineering Support, and Custom Manufacturing.
Ohio Medical Parts originated in 1910 as Ohio Chemical and Manufacturing Company in Cleveland, Ohio. Today Ohio Medical is a producer of medical air and vacuum pumping systems as well as medical suction and oxygen therapy devices. Ohio Medical services the medical device, medical gas, construction/renovation, ambulatory surgery center, industrial, and OEM solutions industries. Ohio Medical devices are manufactured in an ISO 13485 registered and FDA regulated medical device manufacturing facility. Product offerings include medical devices such as flowmeters, hoses, gas regulators, and suction regulators, as well as medical gas devices such as medical gas systems, vacuum pumps, air compressors, and medical gas accessories.
CMI Health, Inc. (CMIH) is an American manufacturer and distributor of patient monitoring devices that was established in Alpharetta, Georgia in 2013. The company produces various medical devices, including peak expiratory flow rate (PEFR) and forced expiratory volume in one second (FEV1) measurement systems, vital sign monitors, oximeters, and cloud-based remote monitoring and data sharing software. These are used extensively in large hospitals, recovery centers, and small clinics. CMIH serves clients in the healthcare, sports, and education sectors, including Planet Fitness, Emory Healthcare, and Atlanta Falcons Football Club LLC.
Diamond Systems LLC was founded in the early 1990s and is headquartered in Cocoa, Florida. The ISO 9001-certified company is a distributor of gas detection and related equipment for manufacturers such as Analog, LANDTEC, Viasensor, and GFG Instrumentation used in the biogas, landfills pumping, and medical fields. The company’s product categories include biogas, pumps & controls, gas detection systems, and medical devices. The company also provides in-warranty and out-of-warranty repair and service on many of the components it sells.
Cleatech LLC is a laboratory equipment and cleanroom supply manufacturer and distributor based in Orange, California. The company produces various standard and custom-made products for laboratory use. These range from furniture, such as cleanroom storage cabinets, to laboratory equipment, including fume hoods, incubators, and microscopes. Additionally, the products are available in fire-resistant, anti-static steel, acrylic, polypropylene, PVC, and polycarbonate. Its products are for controlled-environment applications in the medical, research, food, chemical, and aerospace industries.
Control Instruments Corporation was founded in 1969 and is currently headquartered in Fairfield, New Jersey. The company engineers and manufactures solutions to both simple and complex gas detection problems that arise in pollution control, wastewater treatment, coil coating, and other industries. The company’s primary products include flammability analyzers, BTU analyzers, flame ionization detectors, infrared process analyzers, and gas sensors. The company also sells various accessories including fuel changeover systems, calibration equipment, and touchscreen operator interfaces to control multiple remote sensors concurrently.
Compressed Air Systems was founded in Tampa, Florida in 1963. Compressed Air Systems supports customers in a wide array of industries including food & beverage, medical applications, industrial, electronics, fleet maintenance, aerospace, pharmaceuticals, plastics processing, CNC machine shops, and woodworking. Compressed Air Systems sells air compressors, railcar gate openers and various related products. Compressed Air Systems also offers services including audit, leak compressed air leak elimination, compressed air rentals, and turnkey packages for industrial equipment systems.
Serrax Technologies LLP is an Indian manufacturer of air quality monitoring equipment that was established in New Delhi in 2021. The company produces a range of devices and instruments for monitoring gasses and air quality in industrial processes, including oxygen head space analyzers, dust samplers, automatic weather stations, and web-capable sound monitoring stations. These are used for optimizing the safety, efficiency, and environmental sustainability of industrial facilities. Serrax Technologies primarily serves clients in the food and beverage, environmental, pharmaceutical, and energy production sectors.
HORIBA RADIO LABORATORY was established in Japan in 1945 and has spent the last three-quarters of a century growing as an R&D company and engaged in international operations. HORIBA Scientific offers 200 years of experience developing high-performance scientific instruments and analytical solutions. The HORIBA Group of worldwide companies provides an extensive array of instruments and systems for applications ranging from automotive R&D, process and environmental monitoring, in-vitro medical diagnostics, semiconductor manufacturing, and metrology to a broad range of scientific R&D and QC measurements. Operating in Asia, Europe, and North and South America, HORIBA scientific develops solutions that go beyond just products.
Ace Gas Analysers Private Limited (AGA) is an Indian manufacturer of various industrial gas leak detectors and analyzers founded in 1995 as the flagship company of the Ace Group. Based in Mumbai, Maharashtra, the company's products include flue gas analyzers, oxygen monitors, multigas detectors, and continuous emissions monitoring systems which include data loggers and specialized software. These are used by chemical, cement, and fertilizer manufacturers, as well as by clients in the petrochemical and power generation industries.
Omegawave Inc., founded in 1995, is a Japanese manufacturer based in Fuchu, Tokyo, specializing in laser hemodynamics measuring instruments. The company’s product line includes 2D laser blood flow imagers to capture images of various body parts, complemented by software for thorough image analysis. It also produces laser blood flowmeters for non-invasive and continuous blood flow monitoring. The company further develops tissue blood oxygenation monitors, providing blood volume and oxygenation level measurements. These instruments feature data acquisition systems and computer-based fast Fourier transform (FFT) analyzers, doubling as oscilloscopes and spectrum analyzers.
Process Insights is a designer and manufacturer of water and gas analytical instrumentation that was established in 2012 as a portfolio company of the private equity firm Union Park Capital. Headquartered in Houston, Texas, the company produces detectors, sensors, monitors, and analyzers for measuring physical environmental parameters such as moisture, gas composition, or humidity. It also offers software and instrumentation for environmental compliance and process control applications. Process Insights also provides performance verification and factory acceptance testing for its clients in the petrochemical, power generation, semiconductor, and environmental protection sectors.
Industrial Scientific is a manufacturer of gas detectors and is based in Pittsburgh, Pennsylvania since 1985. The company designs and produces various gas detection equipment from single to multi-gas detectors, wireless connectivity devices and accessories for real-time site analysis, updates on the status of workers, and maintenance support. The products and services are classified based on applications such as working in confined spaces, or the industries they are used for. The solutions can be acquired for both personal as well as area monitoring in the fields of food and beverage, chemical plants, mining, steel manufacturing, and more.
Nova Analytical Systems is a part of Tenova Goodfellow Inc and is based both in Hamilton, Ontario and Niagara Falls, New York. The company is a designer and manufacturer of dependable gas analysis equipment serving customers in a diverse range of traditional and emerging industries around the world. The company’s gas analyzing equipment is used in flue gas & emissions, power generation & hydrogen purity, hazardous area gas quality, and oil & natural gas quality, measuring levels of carbon monoxide, sulfur dioxide, and other chemicals.
EdgeTech traces its roots back to 1965 in Massachusetts and currently operates both out of West Wareham, Massachusetts, and Boca Raton, Florida. The company is a manufacturer of underwater technology solutions including sonar, bathymetry, and other technologies. These solutions are often used in hydrographic surveys, retrieval situations, offshore energy, and underwater research applications. Among the company’s product lines are Sonar solutions, custom-engineered products, acoustic releases, and motion reference units. They can be used to survey pipelines, discover shipwrecks, measure river flow, and locate shallows among other uses.
AMETEK Process Instruments, was founded in and is currently headquartered in Pittsburgh, Pennsylvania as a business unit of the Process & Analytical Instruments division of AMETEK, Inc. The company is a manufacturer and engineer that serves customers in markets such as power generation, pollution monitoring, glass manufacturing, semiconductors, and fuel cell research. The company designs analyzing equipment for customer-specific applications. The company manufactures under brands such as Chandler Engineering which produces gas gravitometers, Process Instruments, THERMOX, Trace Analytical, and Western Research.
Analox Group, established in 1984 and headquartered in Leeds, UK, is a manufacturer and supplier of gas detection instruments and systems. The company’s product range includes portable gas detectors, fixed gas detectors, gas monitoring systems, gas calibration services, and gas training courses. These products serve diverse industries, including oil and gas, chemical, pharmaceutical, utilities, and construction. The company’s services include sales, maintenance, custom design and manufacturing, and technical support. Besides, Analox is devoted to delivering quality gas detection instruments and systems, as demonstrated by its ISO 9001:2015 certification.
DOD Technologies was founded in 2003 and is based in Cary, Illinois. The company is an all-in-one gas detection supplier of low-level toxic gas monitoring systems and solutions for industries ranging from semiconductors and commercial to foam manufacturing and emergency response. The company uses a global network of suppliers to reach customers in countries around the world. The company has four primary categories: fixed colorimetric, fixed electrochemical, fixed FTIR systems, and portable systems. The company also offers equipment repair, calibration, installation, design, and training services.
Ranking as of April 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Cleatech LLC |
8.2%
|
| 2 | Fluid Aire Dynamics |
7.5%
|
| 3 | PureAire Monitoring Systems, Inc. |
6.7%
|
| 4 | Industrial Scientific Corp. |
6.7%
|
| 5 | CMI Health, Inc. |
6.0%
|
| 6 | Analox |
6.0%
|
| 7 | Diamond Scientific |
6.0%
|
| 8 | Oxigraf, Inc. |
6.0%
|
| 9 | Control Instruments Corp. |
6.0%
|
| 10 | Serrax Technologies LLP |
5.2%
|
Derivation Method
The ranking is calculated based on the click share within the oxygen monitor 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
|
9 | 75.0% |
|
India
|
2 | 16.7% |
|
Japan
|
1 | 8.3% |
63 products found
63 products
Ichinen Manufacturing Co., Ltd.
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The definitive version of oxygen deficiency countermeasures and concentration monitoring. A highly functional oxygen concentration meter. JKO-25Ver...
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New Cosmos Electric
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A type of combustible gas detector used in the hand. Prevention of flammable gas explosion and anti -oxygen deficiency ･ Explosion -proof structur...
Dräger
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Ichinen Manufacturing Co., Ltd.
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Automatic System Research Co., Ltd.
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Measuring "oxygen concentration" ■Features ・Measurements can be made not only in air and liquid, but also in vacuum environments, seawater, and s...
Ichinen Manufacturing Co., Ltd.
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This is a low concentration oxygen meter that specializes in oxygen concentrations of 10vol% or less. This is the low concentration compatible vers...
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Ichinen Manufacturing Co., Ltd.
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Dräger
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New Cosmos Electric
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It is optimal for prior measurement of work defined by oxygen deficiency, and can be carried and real -time measurement. ◆ XO-326ISA (5m code body...
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■Features ・Dustproof, waterproof, and explosion-proof construction allows it to be used in a variety of locations. *Rechargeable battery specifica...
Yagyu Shokai Co., Ltd.
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■Features - A lightweight and portable gas alarm. ・Alarm value can be set in two stages. ・With alligator clip *Inspection is required once a year.
Yagyu Shokai Co., Ltd.
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■Features -Equipped with an automatic "atmospheric correction" function that saves you the trouble of correction. -Equipped with an atmospheric pre...
Yagyu Shokai Co., Ltd.
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■Features - Equipped with an atmospheric pressure correction sensor, so the indicated value does not fluctuate due to atmospheric pressure. ・The d...
Yagyu Shokai Co., Ltd.
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■Features ・This is a wearable disposable oxygen deficiency alarm that can only be used for 2 years. ・The remaining expiry date is displayed on th...
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■Features -A lightweight and compact oxygen concentration meter that can measure temperature. ・With soft case
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■Features ・Dustproof, waterproof, and explosion-proof construction allows it to be used in a variety of locations. *Size excludes protrusions *Rec...
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■Summary oxi::lyserTM is a fluorescent measuring device that continuously measures oxygen concentration in water. Dissolved oxygen concentration ch...
