Several questions about differential pressure flow meters

You should know that a balanced flow meter also belongs to the category of differential pressure flow meters; the square root of the differential pressure is proportional to the fluid flow rate. As long as there is fluid flow, a differential pressure is generated, and thus flow can be measured； I really don’t know how to answer your first question; tantalum is more corrosion-resistant

For pressure differences that are not too large, such as 30 KPa and so on, double-flange differential pressure gauges are differential pressure gauges with extremely poor accuracy. Unless it’s absolutely necessary, avoid using double flanges for flow measurement. Use double flanges. It’s like being extremely hungry, so desperate for food that one ends up eating feces as food – meow meow meow. Eating feces is a very different thing from eating stinky tofu; I swear I eat feces. If you don’t believe it, go check Baidu :lol

Question 1: What value must the differential pressure calculated by a differential flow meter reach in order to use a double-flange differential pressure transmitter for pressure measurement? Is the 316L diaphragm the same as a tantalum diaphragm? Double-flange differential pressure transmitters are available in various ranges, and the choice should be based on actual conditions; for example, they can be selected for media that are highly corrosive, prone to crystallization, or prone to precipitation, and for which it is difficult to establish a proper connection ； What Brother Pig said upstairs is completely correct – using double flanges at low measurement ranges can affect accuracy, but when it’s necessary to use them, then that’s the choice to make ； The range is largely independent of the material of the diaphragm. Tantalum diaphragms can handle a wider range of media and offer better corrosion resistance against certain substances, but they are much more expensive. Question 2: Example: When using a balanced flow meter to measure chlorine, does it depend on the flow rate of chlorine or on the balanced differential pressure value to determine the measurement? Throttling devices belong to the category of classical flow meters, and they are based on a large amount of experimental data ； Balance-type flow meters are also based on this fundamental principle; therefore, accurate measurement is not possible if the flow velocity does not reach the specified value, as the fluid does not enter a stable state of flow. This is my personal opinion for reference only.