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Different high quality gas mixtures types:
Specific instrument calibration mixtures
An instrument is called specific because it measures one specific substance (or family of substances) and cannot be used for others. Specific instruments are normally calibrated with a zero gas and one or more span gases. Zero gas is normally a pure gas not containing the component to be measured, and as similar to the matrix of the measured sample as possible. Normally this is synthetic air or nitrogen. The purity of the so called zero gas must be sufficient for the application (grade 5.0 till 7.0). For a typical single point calibration, the span gas is optimal a mixture of 90% of measured value of component in matrix (if measuring 50 ppm span calibration point will be 0.9 x 50 = 45 ppm.) Therefore our standard mixtures have concentrations correlating to 90% of typical measuring values.
General instrument calibration mixtures
An instrument is called general when the instrument can be used to analyze a wide variety of chemical substances. General instruments like gas chromatographs (GC) are often calibrated by creating a calibration line or curve covering the intended measuring range. Therefore our standard products are used to generate the calibration points at such a line or curve.
Threshold monitor mixtures
To avoid and warn for occupational or fire hazards special monitors are used. These are specific instruments that are set to alarm when a pre-set concentration of the substance monitored is reached. High quality gas mixtures for these types of applications have typically half and full time weighted threshold limit value concentration for the substance in air (if this is not possible nitrogen is used,) or for flammable products typical concentrations are 20, 40, 50, and 60% of Lower Explotion Limit (LEL).
Most liquefied hydrocarbon mixtures are supplied with additional head space pressurization using a high purity inert gas such as helium to prevent the lighter hydrocarbon components from separating after final production. To maintain composition during use, the mixture may supplied in a cylinder using a dual port valve to allow additional pressure to be introduced as required to keep the head space pressure consistent.
Of course is it possible to order any kind of gas mixtures. The limiting factors are as always chemical and physical properties coupled to our commitment to your and everybody else's safety.
For more information please take a look in our product catalogue.