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Vol. 229, Issue 1, January 2019, pp. 11-17




Response Time Improvement of Gas Density and Gas Composition Sensor

1 Axel Kramer, 2 Teresa Jorge, 1 Mariya Porus, 1 Thomas A. Paul, 3 Rolf Pleisch and 3 Dieter Zeisel

1 Corporate Research, ABB Switzerland Ltd, 5405 Baden-Dättwil, Switzerland
2 Institute for Atmospheric and Climate Science (IAC), Swiss Federal Institute of Technology (ETH), 8092 Zürich, Switzerland
3 Trafag AG, 8608 Bubikon, Switzerland
1 Tel.: +41585867635, fax: +41585864006

1 E-mail: axel.kramer@ch.abb.com


Received: 30 November 2018 /Accepted: 31 December 2018 /Published: 31 January 2019

Digital Sensors and Sensor Sysstems


Abstract: We report on response time investigations of a commercial industrial gas density sensor. The sensor is typically applied to both pure gases and gas mixtures and can be used as stand-alone sensor or as part of a sensor system for gas composition determination of binary gas mixtures. The core element of the density sensor, a micro-mechanical quartz oscillator, is typically protected from dust and corrosive contaminant gases by a standard built-in filter package. This filter package determines the diffusion rate of the gas to the quartz and thus the response time. In order to relate this gas dynamics to the filter type, we tested sensors of different filter configurations (thickness and pore size) for pure gas (nitrogen, sulfur hexafluoride) and for gas mixtures (nitrogen plus perfluoroketone) and measured the respective response time. We found that changing or removing a specific element of the filter package can improve the response time by one to two orders of magnitude. These findings will trigger a novel sensor package for applications where fast sensor response is critical.


Keywords: Gas density, Quartz resonator, Sensor package, Filter, Gas diffusion, Teflon membrane, Sensor response time, Binary gas mixture, Gas composition.


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