What is difference between air and zero air?
The main difference between Atmospheric Air and Zero air is that Zero Air contains much lesser impurity contents of water vapor and Hydrocarbons than Atmospheric air. Zero Air is produced by mixing of Pure Nitrogen and Pure Oxygen in a controlled quantity composition and under controlled atmosphere.
Why is it called Zero air?
Zero air refers to air that has been purified. For it to be classed as zero air it must contain less than 0.1 PPM of total hydrocarbons. A hydrocarbon is a compound that contains only hydrogen and carbon. Hydrocarbons are the main components of natural gas and petroleum.
What is zero air gas used for?
Uses Of Zero Air In Gas Chromatography for FID detector as a Flame Gas. In Gas Chromatography for FPD detector as a Flame Gas. In Gas Chromatography for AED detector as a Dry Air Purge Gas. In Emission analyzers to calibrate and check various impurities of Hydrocarbons.
Does zero air contain CO2?
The Zero and Ultra Zero Air Generators produce laboratory grade purified air for FID (flame ionization detectors) and other detectors. The Ultra Zero Air Generators will remove CO and hydrocarbon pollutants to less than 0.1 ppm, and NOx contaminants to 1 ppm. Carbon dioxide is also removed to about 1 ppm levels.
What is the composition of oxygen cylinder?
Numerous hospitals also have the medical oxygen delivered in oxygen cylinders. Medical oxygen comprises of minimum 90% oxygen with 5% nitrogen and 5% argon. There are different ways of making oxygen but all the techniques eliminate nitrogen, moisture, hydrocarbons and CO2 are removed leaving behind only oxygen.
What is gas zero span gas?
Zero-calibration gases are used when gas detection or gas analyzers are calibrated with an analyte gas structure that the detector will not respond to. A span calibration gas is more advanced, as it’s a detectable gas concentration that’s precisely composed and used for a gas detector or analyzer.
What is a zero air generator?
Zero air generators completely remove hydrocarbons, CO2, NOx and H20 from the air stream. This avoids the need to use inconvenient air cylinders, which are hazardous for laboratory operations.
What is zero air in gas chromatography?
Zero Air is air which has had hydrocarbons removed via a process of oxidative catalysis to ensure it only contains less than 0.1 parts per million (PPM) of total hydrocarbons. For these applications the zero air is usually supplied in one of two ways, via pressurized gas cylinders or via a gas generator.
What is the air composition?
Air is mostly gas The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
How many Litres of oxygen are in a cylinder?
Each vertical unit represents 340 litres, which is equivalent to one standard size cylinder.
What is the difference between zero and span?
Our “Zero” is an offset adjustment, meaning that if the measured value is 2% up or down, that it just needs an offset or zero adjustment around the set point. The “Span” is a sensitivity adjustment, meaning that for a given change in absorbance, there is a given response in the digital measurement.
How is zero air used in gas chromatography?
In many laboratories, Zero Air is synthetic air provided by an expensive high-pressure gas cylinder. While this is a satisfactory method, the use of an in-house generator to provide Zero Air for FID detection is safer, more convenient, more reliable and more economical than the use of high pressure cylinders.
How is zero air used as an oxidant?
Zero Air, which contains <0.1 ppm of hydrocarbons, is typi- cally used as the oxidant. In many laboratories, Zero Air is synthetic air provided by an expensive high-pressure gas cylinder.
Why is there a need for zero air?
Essentially a mixture of oxygen and nitrogen, zero air is required for laboratory applications which would be negatively affected by the presence of hydrocarbons or small levels of sulphur or nitrous oxide. These gases can sometimes be present in air due to pollution.
What kind of gas does a zero air generator use?
The Precision Zero Air 3.5l generator is designed specifically to supply clean, dry, hydrocarbon-free air to be used as flame support gas for GC. The Precision Zero Air 30L is engineered specifically to provide flame support gas to multiple GC detectors.