The production of pure gases can be achieved through air separation. The process first involves cooling atmospheric air until it liquefies and then selectively distilling its components at their respective boiling points.
An air separation plant will produce enormous volumes of high purity gases, typically nitrogen, oxygen, argon and sometimes other inert gases, and supply them to important industries. Different factories use different air separation techniques as part of their commercial production run. Cryogenic distillation is the most common method as evident by the number of cryogenic air separation units (ASUs) operating to produce nitrogen, oxygen or argon. Other methods, such as membrane technology, pressure swing adsorption (PSA) and vacuum pressure swing adsorption (VPSA), are utilized when the goal is to separate a single gas from ordinary air.
Once gases are separated from air, they are analyzed for impurities, which then need to be removed if present. Oxygen is considered an impurity in the production of high purity gases, and even trace amounts can prevent air separation companies from releasing their products to customers. That is why oxygen analysis with a strong emphasis on measuring trace oxygen accurately and reliably in the range of ppm or even ppb plays such a critical role.
The accuracy and reliability of any trace measurements can be tied directly to how well an analyzer is designed and engineered. AMI Trace Oxygen Analyzers outperform other units on the market because they contain and employ the industry’s most advanced technologies, including our patented Eliminator Cell Block™, Bullet Sensor Technology™ and Command Center Electronics Platform™ to meet the challenging requirements of separation applications. We offer PPM O2 analyzers in both permanent mount and portable configurations that guarantee to measure oxygen levels as low as 0.05ppm accurately and consistently.
If your production application demands performance and reliability, you will find that our trace oxygen measurement solutions set the bar for the industry. So contact us today and experience the difference!!
Hazardous area permanent mount trace oxygen analyzer
Hazardous area portable trace oxygen analyzer
Hazardous area permanent mount percent oxygen analyzer
Hazardous area permanent mount hydrogen sulfide analyzer
Hazardous area portable hydrogen sulfide analyzer
General purpose permanent mount trace oxygen analyzer
General purpose permanent mount trace oxygen analyzer. Atmospheric pressure sample source
General purpose permanent mount percent oxygen analyzer
General purpose permanent mount percent oxygen analyzer. Atmospheric pressure sample source
Multichannel general purpose permanent mount trace oxygen analyzer
Multichannel general purpose permanent mount trace oxygen analyzer for atmospheric pressure samples
Multichannel general purpose permanent mount percent oxygen analyzer
Multichannel general purpose permanent mount percent oxygen analyzer for atmospheric pressure samples
Low cost Division 2 area permanent mount trace oxygen analyzer
General purpose rack mount trace oxygen analyzer
Area safety – wall mount oxygen deficiency monitor
Area safety - permanent mount oxygen deficiency monitor
General purpose percent oxygen probe
Ultra-stable Percent oxygen probe
General purpose rack mount percent oxygen analyzer
Portable Ultra-stable Percent oxygen analyzer
Portable Ultra-stable Percent oxygen analyzer for ambient pressure samples
Portable Ultra-stable Percent oxygen analyzer for aerospace
Conventionally we refer to the fuel-cell type galvanic sensor as “Electrochemical”. It is built using a liquid electrolyte, a noble metal cathode and a lead (typically) anode, and uses a Teflon™ membrane to control the oxygen flow into the active area. Such sensors are comparatively inexpensive, reliable and have been used for many years. They are the only practical way of measuring ppm levels of oxygen, and are also appropriate in many cases for measuring percent levels particularly when measuring in a flammable gas background.
Electrochemical sensors are a disposable part like a flashlight battery. In typical use they last about a year, and require regular calibration. They respond to the partial pressure of oxygen. They are specific to oxygen, and are not affected by the presence of flammable gases. Trace sensors have a zero output in the absence of oxygen, which means that they do not need to have a zero calibration – an almost impossible task in practice. They require no power and are comparatively low in cost. They require temperature compensation which is built into the analyzers that use them but they may respond to a sudden and rapid temperature change. They will also respond to barometric pressure changes in direct proportion to the absolute pressure. These latter characteristics are normally only significant in oxygen deficiency monitoring applications.
Electrochemical sensors should be used in general percentage measurements, in hazardous atmospheres, and with flammable background gases or to measure trace levels of oxygen. For percent measurements in inert background gases such as air, the zirconium oxide sensor is the better choice if power is available.
This kind of sensor uses a ceramic material at high temperature to measure oxygen. This general kind of sensor is commonly used in automobiles to control the air-fuel ratio, but the particular design used for gas analysis is quite different. It has a number of advantages in that it is extremely stable, very long-lived, and immune to barometric and temperature changes. On the other hand zirconium oxide sensors will oxidize anything flammable in the sample stream, burning up any oxygen present while they do so, so that they cannot be used in any gas stream with flammable components, or effectively with ppm levels of oxygen because any slightest trace of anything flammable (such as hydrocarbon gases, carbon monoxide or even oils from your fingers) will eat up trace oxygen giving a falsely low reading.
Zirconium oxide sensors should be used to measure percent levels of oxygen in inert atmospheres, such as the amount of oxygen in the air in an enclosed space. In this application they will last for many years without any real need for calibration or replacement. They should not be used with flammable gases or for measuring ppm levels of oxygen.