05.07.2021

Portable Sampling System PSS-STS

For the Determination of Total Mercury Concentrations in Flue Gas.

Our new sampling system has impressed with high reliability and precise results during field tests in different application areas. Our many years of experience in designing probes definitely contributed to the technically sophisticated construction of a probe that is required for sampling. Also our expertise in the field of gas conditioning as well as experience with system components in mobile conditioning units had a positive influence on the development of the PSS-STS Sampling System.

The high measurement accuracy during sampling, in combination with the downstream analysis of the samples in the laboratory, enables extremely low detection limits that even surpass the current regulations (DIN CEN/TS 17286) for measuring mercury emissions.

PSS-STS Complete System (without heated line)
Detailed view of traps in the sample probe

An Overview of the System

From Sampling to Analyzing – The Functional Principle.

Gas is extracted from the process using the heated gas sample probe and passed through the Sorbent Traps which collect the total mercury of the extracted process gas. The gas is dried by means of a downstream cooler unit and then directed to the control unit. The control unit is used for precise determination of the extracted gas volume and is also equipped with a panel PC for monitoring and controlling the sampling process, including automatic leakage tests. For complete documentation, a measurement report is automatically generated after each measuring. After the collection time (individually adjustable) has elapsed, the Sorbent Traps are removed and sent to a laboratory for analysis. The mercury mass is then determined and the mercury concentration in the exhaust gas is calculated.

The Individual Components of the PSS-STS

The Probe

Our heated gas sample probe was specially developed for the Sorbent Trap system. The associated sample tube is available in different lengths (1 m, 1.5 m, 2 m). The probe has two independent gas paths, one each for Sorbent Traps up to 40 cm in length. The gas sample probe is heated continuously and evenly and is equipped with several sensors for temperature monitoring and control. A thermally insulated handle allows a convenient change of the Sorbent Traps, even on the heated probe.

The Cooling Unit

The cooling unit contains a Peltier gas cooler with an outlet dew point of 3 °C and two peristaltic pumps for condensate disposal, which can be controlled by the system. A condensate vessel with filling level alarm can also be added as an option. A gas dryer and a colorimeter for monitoring humidity are also integrated into the unit. The colorimeter is a sensor that monitors the color changes of an added chemical indicator and generates a fault alarm as soon as the threshold of color change is exceeded so that the sampling is stopped immediately.

The Control Unit

With the most important component, the control unit, the gas volume (standard liters) can be measured for each gas path. The instrument is controlled by a front-panel PC with an intuitive touch user interface. Both gas paths are each equipped with a pump, a filter and a mass flow controller. Optionally, oxygen sensors for leakage monitoring can also be added. All relevant data is recorded and exported in the form of a measurement report. The user is guided through the entire measurement process by the software: from the input of all parameters through leakage tests and sampling right up to the creation of the measurement report.

The Sorbent Traps

The Sorbent Traps developed by us can be used to determine the total mercury concentration in flue gases. For measuring, the traps are inserted into the heated probe and removed again after a defined and programmed collection cycle with a duration of 30 minutes up to a maximum of 14 days. Our Sorbent Traps are available in different versions with various filling volumes, different quantities and types of sections. The choice of traps depends on the measurement duration (short or long-term measurements), the respective application and regulatory requirements. Separate analysis of elemental and ionic mercury is also possible with special Sorbent Traps if required. We will be pleased to advise you on this topic.

Our PSS-STS is an extremely robust sampling system that not only meets demanding industrial operating conditions, but at the same time is also ideally suited for mobile and outdoor applications on account of two robust cases allowing for convenient handling.

Are you interested in further details on this topic? Or do you have a specific application and would like to receive individual advice?

Our Product Manager Marco Meer is at your disposal.

Our expert

Marco Meer
Produkt Manager

Phone: +49 2102 935-134

or contact him directly via our contact form.

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