Gas Conditioning

When extractive online gas analysis is applied, it is essential to present the sample under the correct conditions to the gas analyzer. The basic requirement is to remove particulate matter from the sample gas and to deliver it to the analyzer without loss of the component to be measured. In practice, this involves using a probe with a heated filter, followed by a heated sampling line. Heating is important to keep the gas stream above the dew point to avoid losses. When using a “cold” analyzer, such as an NDIR analyzer, the sample gas is cooled after the heated line in a special gas cooler with little to no contact with the resulting condensate. Heated analyzers, such as FID and FTIR, can receive the sample gas directly after the heated line. For mobile applications, we can advise based on a range of portable probes, heated hoses, and portable gas coolers.

Sampling Probe

Portable probes with high surface area filter elements, highly suitable for mobile extractive gas analysis. Optionally, the suction probe itself can also be delivered heated. The portable gas sampling probes typically self-regulate up to 180 degrees Celsius, but we also supply these with a controlled temperature regulator. A heated sampling hose can be connected directly without cold spots. Our portable gas sampling probes are supplied with a calibration gas connection.

Sampling Hose

In extractive gas analysis, it is desirable to have the shortest possible residence time in the sampling system. In practice, this means the sampling line is kept as short as possible and that the materials in contact with the gas are inert. There should be no loss of measurable components. Compact self-regulating sampling hoses are available for portable probes, with a replaceable inner liner. Lengths of 3, 5, and 10 meters are common in mobile gas analysis. The inner liner is usually made of PTFE or PFA.

Gas Coolers

If a “cold” gas analyzer is used, the sample gas must be cooled. From the heated hose, the sample is typically supplied at 180 degrees Celsius. The mobile cooler can be equipped with two Peltier elements, providing very high cooling capacity. The cooler is constructed so that the condensate has minimal contact with the sample gas. This minimizes component losses. The cooler can be equipped with an integrated sampling pump, condensate detection, and a temperature controller for the heated sampling hose.