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Gas mixing apparatus for automated gas sensor characterization

2014; IOP Publishing; Volume: 25; Issue: 5 Linguagem: Inglês

10.1088/0957-0233/25/5/055903

1361-6501

Nikolai Helwig, Marco Schüler, Christian Bur, Andreas Schütze, Tilman Sauerwald,

Analytical Chemistry and Sensors

We developed a computer-controlled gas mixing system that provides automated test procedures for the characterization of gas sensors. The focus is the generation of trace gases (e.g. VOCs like benzene or naphthalene) using permeation furnaces and pre-dilution of test gases. With these methods, the sensor reaction can be analyzed at very low gas concentrations in the ppb range (parts per billion) and even lower. The pre-dilution setup enables to cover a high concentration range (1:62 500) within one test procedure. Up to six test gases, humidity, oxygen content, total flow and their variation over time can be controlled via a LabVIEW-based user-interface.