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DIN EN 13160-6:2016
Leak detection systems - Part 6: Sensors in monitoring wells; German version EN 13160-6:2016
This European Standard gives specifies the requirements for leak detection systems - class V for use with systems designed for fuels which are flammable, having a flash point up to but not exceeding 100 °C. Systems of class V may detect liquid loss in tanks or pipes below the liquid level. Product will enter the environment before the leak is detected (i. e. sensors in monitoring wells).
Deutsches Institut für Normung [din]