Flow measurement of deionized water
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What type of flow meter should be used for the flow rate of deionized water? Can an electromagnetic flowmeter be used? I don’t want to use metal rotor flowmeters in this process, as they get stuck from time to time and it’s not easy to detect such issues. Please advise, experienced experts
Deionized water does not conduct electricity; electromagnetic methods cannot be used. Vortex flow meters can be employed, or, to put it more positively, mass flow meters can be used
If electromagnetic methods are to be used, Yokogawa CA capacitive electromagnets can be employed; they achieve response times as low as 0.01 us/cm, do not cause vibration, and have a high initial flow rate, making them the ideal choice for vortex flow meter applications. Domestic alternatives should not be considered. Metal tube floats are also an option if high requirements are not necessary. Desalinated water, after going through reverse osmosis and mixed-bed processes, is quite clean; it’s impossible for debris to cause issues with the float
Use a vortex flow meter; for low flow rates, use a float type, with a filter screen and magnetic filter installed at the front end.
If the process flow fluctuation range falls within the measurement range of the vortex flow meter, it is advisable to choose a vortex flow meter. After all, with no maintenance workload, it operates very stably. The range ratio of vortex street meters produced domestically is between 10:1 and 15:1, while those imported from abroad can reach 30:1. The flow velocity range for SIERRA vortex flow meters is 0.3~9.14 m/s, for Rosemount vortex flow meters it is 0.22~7.6 m/s, and for Coriolis vortex flow meters it is 0.4~10 m/s. The original poster can use the above data as a reference for making a choice.
The comment on floor 3 is correct; the capacitive electromagnetic flowmeter from Yokogawa Electric, with its electrode-free design, can be used for pure water with a conductivity as low as 0.01 uS/cm. If the required measurement accuracy is not high, a vortex flow meter can also be used. Alternatively, an ultrasonic flow meter or a turbine flow meter can be used as well.
So, aside from mass flow meters, vortex flow meters are the preferred choice
It depends on the specific flow range and budget; many types of flow meters can be used, such as vortex and turbine meters. The choice depends on the flow rate, and metal tube rotameters are certainly suitable for clean liquids. How is it possible not to notice when it gets stuck?? ? 、
Vortex flow meters have high requirements for straight pipe sections, especially at the pump outlet. Although there is no pump in the case of the effluent streams from the anion and cation beds, the straight pipe section is not very long; it is recommended to use a handheld model. I have used one, and it’s really good