Dräger Safety Ag&co. Kgaa

Nils Haack

Björn Lange

Rigobert Chrzan

Lars Wulf

Burkhard Stock

Wilfried Diekmann

A device for optical detection of a target gas in gas mixtures includes an operation and evaluation unit, a measurement cuvette with optically reflective surfaces on its interior walls and a gas inlet to the environment, a radiation source, a measuring detector and a reference detector unit provided on the measurement cuvette. The measuring detector and the reference detector unit detect the light of the radiation source and produce electrical signals corresponding to the intensity of the detected light. An optical bandpass filter element, constructed to transmit light of a measurement wavelength, is arranged upstream of the measuring detector. An optical double-bandpass filter unit, that transmits light of a first reference wavelength and light of a second reference wavelength, is arranged upstream of the reference detector unit. The operation and evaluation unit operates the radiation source and acquires the electrical signals of the measurement detector and the reference detector unit.

Device with a measurement arrangement for optical measurement of gases and gas mixtures, with compensation of environmental effects

A gas sensor is provided that is delimited from the environment with a preferably replaceable cap () made of a porous, gas-permeable and water-impermeable material, especially sintered PTFE. The gas sensor is protected against environmental moisture and can be permanently provided with the cap () and with a special calibrating adapter () both during the gas measurement and during the necessary calibration. Due to the special design of the cap () and the calibrating adapter (), the gas sensor offers the possibility of remote calibration, which can be carried out with high accuracy and is independent from weather effects, especially wind.

Gas sensor

An explosion-proof gas sensor has a measuring element (), which generates a measured signal that depends on the concentration of the measured gas and is delimited against the environment by means of a porous, gas-permeable and sintered metal body (). The sintered metal body () has a high mechanical stability, so that the use of additional components, which hinder the diffusion of the gas to be measured into the gas sensor and thus prolong the response time of the gas sensor, can be eliminated.

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Lübeck, Germany

Nils Haack