Wedge flow meter range expansion

The differential pressure method is more or less the same in all cases; for example, if the range is set to 20, then the upper limit of the differential pressure under this new range = (20/14) * (20/14) * 16 = 32.65(kPa)

When purchasing a flow meter, the process parameters should be provided by the process itself, such as the range of measurement, pressure rating, and reference differential pressure. If the actual differential pressure during operation exceeds this range, it means that the process parameters are incorrect. If you want to increase the measurement range, you need to ask the manufacturer to recalculate it. One thing to understand is that a flow meter cannot measure flow rates within any arbitrary range; otherwise, to whom would the manufacturers sell their products? You’re asking the flow meter manufacturer whether it’s possible to expand the measurement range, and whether the measurement accuracy will change after that expansion. You need to decide exactly how much you want to expand it, so as not to end up needing more expansion later on. Have the process team prepare a written document; if calculations are possible based on the existing linearity, then proceed with scaling it up – differential pressures can also be calculated. The key is to determine whether the results remain accurate after scaling up

1. The range has been expanded from 14 t/h to 18 t/h, and the differential pressure range has been increased from 16 kPa to 26.449 kPa. 2. For the calculation formula, refer to the example provided by the expert on the 2nd floor. 3. The person on the 3rd floor doesn’t understand what’s important or what the logical sequence is; don’t listen to his nonsense attempts to scare people. The wedge-shaped element is a non-standard throttling component; the manufacturer’s calculations are complete nonsense. The manufacturer just welds a cone and makes a hole – it’s nothing but some rough, dirty work. :lol

The approximate differential pressure when the range is expanded to 18 is 26.4489796; it’s interesting to see how the calculation is done on the 2nd floor. What was said on the 3rd floor makes some sense, but the truth is, even after a flow meter leaves the factory, can the manufacturer really guarantee with certainty that it will be accurate? (Apart from bluffing, of course.) If the measurement range can be expanded while keeping the pressure loss within acceptable limits, and the differential pressure range of the transmitter is sufficient, then the issue is generally resolved. The 4th floor has a clear view, hahaha.

Muddle through is okay, but you have to know it’s wrong; it’s easy to cheat in the manufacturing process