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What Are The Applications of Electrochemical Oxygen Sensors?

Electrochemical oxygen sensors monitor the level of oxygen in ambient air. They monitor a chemical response in the sensor that creates an electrical output proportional to the oxygen level. 

How do Electrochemical Sensors Work?

It works with the help of gas diffusion. Gas unearths its way into the opening of the membrane on top of the sensor housing. Once the gas reaches the active electrode, an electrochemical reaction occurs.

This response is either oxidation or reduction, depending on the type of gas. For example, carbon monoxide gets oxidized into carbon dioxide, and oxygen gets decreased to water.

Oxidation causes the float of electrons to transport from the running electrode to the counter electrode through the external circuit. Reduction adversely causes the float of electrons to transport from the counter electrode to the running electrode. Either path of electron float creates an electric-powered current that is correlated with the high concentration of the gasses.

The electrons in the external circuit detect and increase the current. It measures the output with the calibration of the devices. The devices are examined in PPM (parts per million) to present a percent of the extent of gas.

Electrochemical sensors rely on chemical reactions with changes in the temperature range. Since the temperature keeps varying, there are certain types of temperature compensation that are advised by the experts for the most correct and accurate readings.

The Benefits 

The electrochemical oxygen sensors have advantages over other types of oxygen sensors due to their less power requirements, the vast range of detection; these also do not get affected by the interfering gasses. They are additionally having the benefit of being economic. 

These sensors are more common than we think, the most crucial advantage it has is that it is used to save the lives of people. 

The demanding situations whilst the usage of electromechanical oxygen sensor 

A venture for electrochemical oxygen sensors relies on chemical tactics that may be temperature-dependent. The output of maximum electrochemical sensors will depend closely on temperature repayment to offer dependable readings over a wide scope of ambient conditions.

Another venture for electrochemical oxygen sensors is that over the years the chemical response stops, normally among 1 and three years relying upon the sensor design. Storing them in oxygen-unfastened surroundings will now no longer upload to the existence span of the sensor. As the sensor takes a long time it calls for common recalibration and isn’t as correct as different sensors.

Unfortunately, the lifetime of those sensors may be severely decreased if they may be implemented to gasses containing acids – inclusive of hydrogen sulfide, sulfur dioxide, or hydrogen chloride, except the offending gas constituent is scrubbed previous to evaluation. The sensors also are vulnerable to pressurization and a stress regulator / manipulate valve is recommended.

However, due to their rugged design, low cost, and self-energy electrochemical sensors are used in lots of devices, mainly handheld gas analyzers.

Applications Areas:

Oxygen Sensor AO2 produces analog current, these are self-powered, and that makes them beneficial for measuring oxygen gas battery-operated underwater diving and handheld safety devices. Examples ought to encompass breathalyzers, breathing sensors, blood glucose sensors, etc.


These are used in the breathalyzers used by law enforcement personnel. These are used to detect the level of alcohol in a person’s body; this detects the different gasses present in the breath and assesses the amount of alcohol.

Blood Glucose sensor

As the name suggests, this is a medical diagnosis machine that has an electrochemical oxygen sensor embedded into it and works by detecting the level of glucose in the blood. For this, there is no need to draw the blood out and then run the calculations on the computer to get the results. It will show the result in a limited time with high accuracy.

Respiratory Carbon Dioxide sensor

This is again another medical device. This is used to measure the amount of oxygen in the carbon dioxide 

  • (Electrochemical) Carbon Monoxide sensor
  • (Electrochemical) Oxygen sensor

What makes these sensors desirable?

The electrochemical sensors possess a certain set of features that makes them desirable for various applications. These features enable the sensors to perform the detection and analysis very accurately; some of these features are as such:

Detection Analysis

It involves electrochemical poisonous gas sensors; one of the most beneficial capabilities is detection evaluation. With this characteristic, you may examine numerous electric currents which might be produced through oxidation. By doing so, the sensors can carry out an in-depth evaluation of numerous sorts of devices, permitting them to discover current or future issues earlier than they develop into bigger issues.

While an alarm controller or siren will warn about the gas leak or other malfunction, the evaluation characteristic guarantees the operation stays unhindered. By having a steady test at the levels of oxygen, the need to make vital maintenance or device replacement gets lower.

Accurate Configuration

Being capable of providing the correct configuration is vital for any device. Through the usage of specialized pattern box devices, an electrochemical oxygen sensor can assist off site tracking structures with the capacity to live before the tough conditions.

For example, sensors can offer timeline presentations that display fluctuations in oxygen concentrations, giving technicians the capacity to locate the center problem. Identically, oxygen sensors also can be calibrated to monitor concentrations of dangerous materials at identical times. 

Undetected Leaks

Above all other features, having a gas sensor to detect the oxygen level in the air is critical to locate the leaks in pipes, valves, or different areas. In such areas, accurate leak detection through other sensors is difficult due to technical reasons. Along with restricted areas, studies labs, application stations, and numerous sorts of processing and production centers endured wanting 24/7 tracking.

By being capable of locating the undetected leaks, the sensors will allow the protection steps to stay correct and dependable whilst compiling information. Keeping a tab on close-by gas leaks may also assist offer information in real-time to protection engineers. This will reveal the quantity of oxygen in a particular place facilitates guard employees, mainly whilst engineers want to decide the quality path of motion to break out harm.

Keeping the Facility’s Gas Level under Check

Along with being capable of revealing particular devices, oxygen depletion structures permit commercial operations. The capacity to maintain a steady test on all the poisonous and inert gasses of their vicinity. From offshore drilling structures to restricted areas inside chemical processing vegetation or refineries. An oxygen depletion sensor is a critical element of any gas detector.


Regardless of the business or commercial setting, oxygen depletion is one of the highest risks encountered on a day-to-day basis. There are several types of applications where the right level of oxygen is important for the protection of workers. 

Along with the level of oxygen, other types of poisonous gasses are also needed to be checked and under control. Due to the lack of oxygen, the probabilities for fires or explosion accidents are increased alongside. The poisonous gas buildup in a specific place. The answer for such problems can be the right types of electrochemical oxygen sensors. 

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