201919th International Congress of Metrology
|Number of page(s)||5|
|Section||Innovations in Flow / Innovations en débitmétrie|
|Published online||23 September 2019|
The influence of Gas Type on a Thermal Mass Flowmeter Calibration Results
Gas and liquid flow laboratory of Cherbourg -Trescal, France
* Corresponding author: email@example.com
The Thermal Mass Flowmeters (TMFMs) have been used for more than twenty years in the industry for various uses, including sweeping, gas injection, and welding. Their operational behaviors are still not well understood by operators. TMFMs, could be used with multiple process gases, and sometimes, highly toxic gases and they are generally calibrated with nitrogen or air. In the case of using a surrogate gas for calibration, a correction factor (k-factor) is required to estimate the flow of the process gas. Most of the time, these correction factors are indicated in the manufacturer’s instructions manual. In the field of metrology, k-factor plays a significant role in calibration results. Therefore, it is important to understand the influence of gas type used in calibration on the results if the process gas is employed or a surrogate gas with the recommended k-factor. The aim of this paper therefore is to discuss and evaluate the impact of using manufacturers k-factor in place of the actual process gas during calibration. The tests results presented within this article are considered concerning within the field of metrology.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.