Title: Validation of a calibration-free, high-temp dTDLAS-based humidity sensor by means of PTB humidity standards
Authors: Bohlius, Henning, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Biondo, Luigi, Technische Universität Darmstadt, Darmstadt
Bubser, Florian, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Werhahn, Olav, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Wagner, Steven, Technische Universität Darmstadt, Darmstadt
Ebert, Volker, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 3.4, Analytische Chemie der Gasphase
Contributors: HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
Pages:7
Language:en
DOI:10.7795/810.20200122
Resource Type: Text / Presentation
Publisher: Physikalisch-Technische Bundesanstalt (PTB)
Rights: Download for personal/private use only, if your national copyright law allows this kind of use.
Dates: Available: 2020-01-22
File: Download File (application/pdf) 1.21 MB (1271556 Bytes)
MD5 Checksum: 1185a507b2f531551eeabc4d50892406
SHA256 Checksum: f3294ee1b349356006d9aa7a06f168c227a13b5f89e99aa44eae84f94b6f280f
Keywords: Gas metrology ; moisture ; H2O ; hygrometry ; dTDLAS ; diode laser ; laser spectroscopy ; industrial processing ; drying ; EMPIR ; HIT
Abstract: Results of the collaborative study of TU-Darmstadt and PTB in the HIT pro-ject were presented at the final work-shop at INRIM, Torino, Italy.

PTB has set up a system for the valida-tion of dTDLAS-hygrometers which were developed by TU-Darmstadt within the framework of HIT. The calibration facility is designed to calibrate humidity in air measurement devices at tempera-tures up to 100 °C. The system was de-signed to perform validations and/or calibrations of a device under test like the dTDLAS-hygrometer from TU DA. Traceability was achieved by compari-son to a primary humidity standard via a reference chilled mirror hygrometer.

The developed dTDLAS hygrometer was shown to yield relative deviations of less than 5 % as compared to the reference value. This is nicely confirm-ing its capability to be used as a trans-fer standard. Based on PTB’s validation result and on further validation per-formed at INRIM for temperatures above 100°C the dTDLAS hygrometer could subsequently be applied suc-cessfully at an industrial site within the project thus demonstrating the valuable capabilities of such dTDLAS systems for industrial applications.

The measurement approach of dTD-LAS-hygrometers complying with the TILSAM method1 like the one from TU-Darmstadt in HIT is promoted by PTB 3.42.
Citation: Bohlius, Henning ; Biondo, Luigi ; Bubser, Florian ; Werhahn, Olav ; Wagner, Steven ; Ebert, Volker. Validation of a calibration-free, high-temp dTDLAS-based humidity sensor by means of PTB humidity standards, 2020. Physikalisch-Technische Bundesanstalt (PTB). DOI: https://doi.org/10.7795/810.20200122