Design Standard confirms to ISO 5167BS 1042. This is basically an online Rotameter either glass tube (SDG Series) or metal tube (SDMT Series) placed in a By-Pass piping. The only difference is the range orifice of the Rotameter at the inlet. This range orifice is designed in such a way that the differential pressure through the By-Pass piping is equivalent to the differential pressure across the mainline orifice. With this arrangement, rotameter in the By-Pass piping works as a Manometer.
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