New Sample Gas Coolers –High Performance with Low Wash-Out

For continuous extractive gas analysis reliable sample gas coolers are essential to ensure that the sample gas is cooled down to a constant low temperature, e.g. 5°C. At this temperature the water vapour inside the sample gas condensates and can be removed before the gas stream reaches the analyser. This step is crucial to protect the highly sensitive gas analysers downstream from damage caused by condensate.

In addition, depending on the method of measurement and the measured gas components water vapour cross-sensitivities may occur. In this case the analyser takes the water vapour for the gas component that needs to be measured and falsifies the actual measured value. For this reason not only a low but also a constant water vapour dew point is important. With a varying dew point or water vapour content also the measured value would change.

Another important requirement for a sample gas cooler is that the measured values are not corrupted by the wash-out of water soluble gas components such as SO2 or NO2.

Ideally, the sample gas cooler comprises all the those requirements in the smallest possible outlines.

To meet these important requirements JCT Analysentechnik GmbH (Austria) has designed the compact and high-performance Peltier sample gas cooler, with entirely new heat exchanger elements, which are also very easy to replace. These guarantee a reliable separation of water vapour combined with low wash-out rates. Depending on the application, customers may choose from different heat exchanger materials such as PVDF, Duran glass, stainless steel or corrosion-resistant coated aluminium.

The new Peltier sample gas coolers of the series JCM-300 are available with one or two separate gas path, each equipped with a temperature controller. Each gas path can be optionally equipped with one or two Peltier elements (Standard or High Performance). This makes these coolers the perfect solution for nearly all applications. Even for challenging applications with high flow rates in combination with high water vapour concentrations, the coolers of the JCM-300 series may be used.

They provide a highly accurate long-term stable outlet dew point even under changing loads and at ambient temperatures up to 50 °C!

For safe operation all coolers are equipped with a temperature alarm contact. They can also be supplied with integrated condensate pumps for reliable condensate disposal. LED-temperature displays and integrated condensate detectors in the sample gas outlet can be selected optionally for the JCM-300 models with two heat exchangers. The integrated status contact can be used to turn off the sample gas pump in case of malfunction. Thus the gas analyser is protected against damage due to condensate at all times.