How do oxygen analyzers work

The mounting of the oxygen sensor must be done in proper temperature and humidity range and it is mentioned above. The sample gas that is sent to the oxygen sensor must be clean and it must not be corrosive. At first switch on the device after that place, the sensor in the flow of air with a known oxygen concentration after that wait for the device stabilizing and check the reading and if the reading is different than the known oxygen concentration and adjust the dial to the known oxygen concentration and if it cannot be adjusted to the known value then the device is faulty and must be serviced.

By this, we can determine the linearity of the sensor, in order to do this test, we must place the sensor in a stream of non-oxygen concentration between ninety to hundred percent until the reading stabilizes after that calibrate to match this concentration.

After this step measure the room air and it should be Home Forum Tool Contact Us. Facebook Twitter Linkedin Youtube. Primary Menu AutomationForum. Search for: Search.

Home Instrumentation Field Instrumentation What is an oxygen analyzer? How to calibrate oxygen analyzer. Through the connection of an external circuit, the charge transfer or the current in the reaction is proportional to the oxygen participating in the reaction. Using this method for oxygen measurement, it is not affected by the reducing gas in the measured gas, and many sample gas processing systems are eliminated.

In fact, fuel cell oxygen sensors are completely maintenance-free. It measures the composition of a gas based on changes in the amount of ions or changes in current caused by a chemical reaction. In order to improve the selectivity, prevent the measurement electrode surface from being stained and maintain the electrolyte performance, a diaphragm structure is generally used.

There are two types of commonly used electrochemical analyzers: constant potential electrolytic and galvanic cell. The working principle of the constant potential electrolytic analyzer is that a specific potential is applied to the electrode, and the measured gas generates electrolysis on the electrode surface.

As long as the potential applied to the electrode is measured, the unique electrolytic potential of the measured gas can be determined, so that the meter has the ability to select and identify the gas to be measured. Galvani battery analyzer is used to electrolyze the test gas diffused into the electrolyte through the diaphragm, and measure the formed electrolytic current to determine the concentration of the test gas. By selecting different electrode materials and electrolytes to change the internal voltage on the electrode surface, selectivity to gases with different electrolytic potentials is achieved.

The oxygen analyzer is an oxygen sensor composed of zirconia solid electrolyte, and the signal change is an intelligent online analysis instrument composed of a new microprocessor as the core. Mainly used for air separation, automatic analysis of oxygen content in chemical processes; semiconductor, magnetic material production; float glass, cement building materials industry; automatic analysis of oxygen content in various industrial furnaces, heat treatment processes, and scientific research on electronic components, biopharmaceuticals, etc.

View more quality oxygen analyzers with low price and free shipping all over the world. You must be logged in to post a comment. Working Principle and Application of Oxygen Analyzer. This gives rise to a pressure, which is detected by the mass flow sensor. In the cell, two glass spheres filled with nitrogen gas are suspended with strong metal wire. When oxygen molecules having a large magnetic susceptibility flow there, the molecules are pulled toward the stronger magnetic field zone and the spheres are moved away from the zone.

Below are the specific types of oxygen sensing technology used today. Note that each one is best suited for one or more specific applications. Electrochemical oxygen sensors are primarily used to measure oxygen levels in ambient air. They measure a chemical reaction within the sensor that creates an electrical output proportional to the oxygen level.

Because some electrochemical sensors produce their own analog current, they can be self-powered, making them useful for measuring oxygen gas battery-operated underwater diving and hand-held personal safety devices.

Examples could include breathalyzers, respiratory sensors, and blood glucose sensors. In terms of sensor advantages, electrochemical sensors are sought after due to their lower power requirements, lower detection limits, and are often less directly affected by interfering gases. They also tend to be the least expensive kind of sensor.

A challenge for electrochemical oxygen sensors is that they depend on a chemical processes that they are temperature dependent. The output of most electrochemical sensors will rely heavily on temperature compensation to provide reliable readings over a broad scope of ambient conditions. Another challenge for electrochemical oxygen sensors is that over time the chemical reaction stops, typically between 1 and 3 years depending on the sensor design. Storing them in an oxygen-free environment will not add to the life span of the sensor.

As the sensor ages it requires frequent recalibration and is not as accurate as other sensors. However, because of their rugged design, low cost, and self-power electrochemical sensors are used in many devices, especially hand-held gas analyzers.

AlphaSense is one of the most popular manufacturers of electrochemical oxygen sensors. Their sensors are used in dozens of 4-gas detectors and portable safety meters used worldwide. Zirconia oxygen sensors are a type of electrochemical sensor. Carbon monoxide, if present in the test gas, is oxidized by O2 to form CO2 and thereby triggers the flow of current.

The zirconia sensor does not directly sense O2, but rather the difference between the concentration of O2 in the exhaust gas and in the normal air. While zirconia oxygen sensors are most commonly used to control air-fuel ratios in cars and trucks, they are also important in industrial applications. Another feature of this type of oxygen sensor is that the small, zirconium-based element does not require calibration. They also maintain their accuracy when the oxygen is mixed with other gases.

When we look at sensor advantages, Zirconia's ability to work at high temperatures and pressures, the possible application integrations are nearly endless, making this sensor a useful in many industries. For example, every auto manufactured uses two zirconia oxygen sensors, also known as lambda sensors , to adjust the fuel-air ratio for maximum combustion efficiency. Disadvantages of zirconia sensors are that oxygen measurement requires high temperatures.