A zero gas is normally a pure gas that does not contain the component to be measured, and it should be as similar to the matrix of the measured sample as possible. The purity of the zero gas used to set the zero point on analytical instrumentation is critical and must be sufficiently high for the application in question. Contamination of zero gases can significantly influence the results of analytical measurements. Impurities occurring in concentrations as low as parts per billion can have serious consequences, particularly if the impurities are part of the sample to be analysed or if the analyst is not sure which molecules are present in the sample.
Legislation governing pollution and industrial emissions has tightened in recent years, as has fiscal monitoring for oil and gas trading. Consequently, the need to set an accurate zero point has become more important than ever. Increasingly accurate measurements of both product quality and emissions from industry are required. These developments demand precise calibration gas mixtures and ultra-high- purity zero gases.
At Linde, we understand that the reliability of gas analysis is only ever as good as the quality of the instrumentation gases, the accuracy of the calibration gas mixtures and the purity of the zero gases used. Our zero gases spanning synthetic air, nitrogen, hydrogen, argon and helium range in purity from 5.0 up to 7.0, which is the highest commercially available grade (99.99999% pure with 0.1 parts per million of total impurities). We also provide certificates of analysis so you have proof of these exceptional quality attributes.
Complementing this offering, we have a range of gas pressure regulators and gas distribution systems for high-purity zero gases such as these. These are designed to meet the high quality standards required for specialty gases and can deal with high and low pressures plus high and low flows.