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1. Direct fluid visualization systems
1.1 Principle and features
With this method, direct visual inspection of a liquid level is carried out through a transparent wall. In principle, this is a direct measurement only if the device is attached directly to the tank skirt. However, most glass level gauges operate bypassing the main tank, so the level behind the transparent wall corresponds to the liquid head from the plane of the lower connection, and only coincides with the level in the tank if the medium is stable, homogeneous and isothermal. In a boiler drum, for example, due to steam generation, boiling and priming caused by a sudden call for steam, the level indicated is fictitious, which does not prevent it from being very useful.
The transparent wall material is very often glass, but can also...
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Direct fluid visualization systems
Float or plunger systems
Bibliography
Works
Websites
Online course on level measurement using radar technology :
https://academy-online.krohne.com/elearning/fr/cours/mesure-de-niveau-radar/
Engineer's Garage: level sensors :
...Standards and norms
- Tanks for transporting hazardous materials – Tank service equipment – Fill limiters for liquid petroleum fuels. - NF EN 13922 - 2011
- Pressure resistant oblong sight glasses of borosilicate glass without limitation in the...
The catalog of Iso and Afnor standards can be consulted online on the Afnor website: http://www.afnor.fr
Regulations
Arrêté du 8 juillet 2003 relatif au contrôle métrologique des récipients-mesures. NOR: INDI0301736A
Decision no. 09.00.110.003.1 of October 21, 2009 relating to calibration resources in the field of static and dynamic liquid measurement.
Arrêté du 24 mars 2009 relatif aux jaugeurs. NOR: ECEI0906617A
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