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Environmental measurements for air, water and ground pollution use a number of individual calibration standards to measure Nitric Oxides, VOC and BTEX emissions. SPECTRA-SEAL calibration mixtures offer low level reactive calibration with flat line stability, while other environmental mixtures are produced to meet the requirements of regulatory agencies around the world. Within all areas of environmental monitoring, many local governments require that the instrument and sensor calibration gases used be certified to ISO 17025. This is to ensure data is traceable to a national standard, and that overall uncertainties for pollution data are within specified limits.
A wide range of gas mixtures is applied to calibrate the analytical equipment and to ensure its correct operation. Normally, these mixtures are supplied in high-pressure or disposable gas cylinders. Depending on the consumption and the required mobility, the size of the cylinders varies from
1 to up to 50 litres. Linde has developed the ECOCYL portable specialty gas solutions, a small, refillable cylinder equipped with a valve, a fixed pressure regulator and a flow meter. These devices are fully integrated into the cylinder’s protection cap. The result is a safe, easy and ready-to-use system. The end user only needs to open the cylinder valve and choose from the preset flow ranges.
Where the use of cylinder hydrogen is restricted, the HiQ® hydrogen generator is safe to operate, due to its small contained volume (< 40 ml). These units are highly reliable and include a range of features to ensure continuous operation, for example, selectable, multiple alarms alert to unwanted shifts in operating conditions such as low water level, poor water quality, low pressure (leak) and power supply conditions.