Testo Ag

Testo Se &co., Kgaa

Ralf Stich

Rolf Merte

Peter Ziegler

Jürgen Bär

Luciana Pitta-Bauermann

Michael Laufer

A measuring assembly for detecting particles of a particle flow in a gas flow path, including an ionization stage which has an ionization device by which the particles to be detected can be ionized or are ionized. The measuring assembly further has measuring stage with a detector which detects the ionized particles of the particle flow, the detector has at least one electrode to which particles release the charge received at the ionization device. The released charge can be measured via an electric resistor connected to the at least one electrode. This provides an inexpensive and reliable measuring assembly which has a low susceptibility to errors in that the at least one electrode of the detector is designed as a microsystem. In order to improve the measurement of the charge carried by the ionized gas, the pores of a filter substrate are metallized and electrically connected to the resistor.

Particle measuring device in a gas flow path

In the case of an impactor () with an impact plate () and a classifying nozzle () directed at this impact plate (), in the case of which the impact plate () is formed as an electronically readable resonantly oscillating, mass-sensitive element (), it is proposed to move the oscillating crystal () held in an impact plate holder () in relation to the static classifying nozzle () by a motor () during the operation of the impactor ().

Impactor and method for characterizing a carrier gas enriched with suspended particles

In an electrochemical gas sensor (), a carrier substrate () has an underside () and a top side (), wherein an electrode structure () with an electrolyte layer () is arranged at the top side (), while a gas inlet for a measurement gas is formed at the underside (). A porous region () formed of a porous material is provided in the carrier substrate (), such that diffusion openings in the porous material connect the underside () to the top side () in a gas-permeable manner, and a connection () of a measurement electrode () is formed in a gas-tight surface region () at the top side () adjacent to the porous region () and the connection () is at least partly covered by the electrolyte layer ().

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Buchenbach, Germany

Ralf Stich