2025 SMSI Bannerklein

P2EC.7 - Influence of Gas Pressure on Coulometric Trace Humidity Measurement

Event
17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
Chapter
P-2 - Electrochemical Sensors
Author(s)
M. Detjens, C. Tiebe, U. Banach - Federal Institute for Materials Research and Testing, Berlin (Germany)
Pages
715 - 716
DOI
10.5162/IMCS2018/P2EC.7
ISBN
978-3-9816876-9-9
Price
free

Abstract

Planar coulometric sensors were investigated in humidified synthetic air at various absolute gas pressures, i. e. 2 bar, 5, bar, 10 bar, and 15 bar. Humidified gas flow at adjusted gas pressure was split into two flows, one passed a coulometric sensor and the other one passed a reference hygrometer after decompression. Both signals were recorded and then compared after calculation of resulting frost point temperature. Calculation is based on a calibration function obtained at ambient pressure. Comparison showed that an increasing pressure resulted in a higher derivation between sensor signal (calculated frost point temperature) and reference frost point temperature. At an absolute pressure of 2 bar the differences were minor in consideration of the uncertainty, however at 15 bar the differences were 6.77 K. Nevertheless, it was possible to measure the gas humidity at higher pressure with coulometric trace humidity sensors.

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