What instrument is suitable for accurately measuring water flow?
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We produce water with controlled proportions; what instruments are suitable for measuring it? A 4-20mA signal is required. We have used E+H electromagnetic flowmeters, Rosemount vortex flowmeters, and orifice plates with transmitters. The electromagnetic flowmeters from E+H work fairly well, though they sometimes stop displaying readings suddenly. The vortex flowmeters from Rosemount give inaccurate readings at low flow rates. Orifice plates with transmitters are also inaccurate at low flow rates; are there any other good options?
There are no issues with electromagnetic flowmeters and ultrasonic flowmeters
We have used metal rotor flowmeters, which are particularly suitable for measuring water with low conductivity; they also provide a 4-20mA signal output! ! You might as well give it a try
The question is, which one offers better value for money?
Metal rotameters are probably cheaper, right?
If high precision is required, quality can be considered; however, a turbine flowmeter will also work, provided it is calibrated regularly.
Rotary flow meters and electromagnetic flow meters should both work.
As you mentioned, if the display suddenly stops working, it could be due to issues with the manufacturing process – such as bubbles or an incomplete filling of the tube – or it might be because the flow rate is too low; in that case, it’s necessary to choose a flow meter with an appropriate diameter. Yokogawa’s electromagnetic flow meters and vortex flow meters are both excellent choices, and Yokogawa’s flow meters come equipped with a function to detect empty tubes. Flow meters of high quality are certainly accurate, but they are also more expensive
Generally, electromagnetic flowmeters and ultrasonic flowmeters are used for measuring industrial water. Lately, we have been using online-detachable vortex flowmeters, which are patented products from EMCO in the United States; they are quite good, especially for large pipe diameters. They are also inexpensive, and it isn’t necessary to install bypass pipes in the process pipelines, thus saving on costs. Moreover, they operate stably over time – for the owner’s reference!
The cost-performance ratio of American Polyson ultrasonic flowmeters is really good.
Apart from ultrasonic sensors, any type of flow meter can be used
Electromagnetic flowmeters are clearly not suitable; ultrasonic vortex flowmeters can be used. This post was last edited by *AJACK on 2007-12-27 08:11.]
Should I send a telegram? Are they dry batteries, or DC24V, or AC220V?
If you have used flow meters and are not satisfied with them, please use weight-based measurement. In the projects I have worked on, two sets of measuring devices were always used; weight-based measurement is convenient and reliable, and it requires an annual inspection, because….
Electromagnetic flowmeters offer a good cost-performance ratio, so they should be given priority consideration. Given their wide measurement range, it is advisable to take low-flow conditions into account when selecting them; sometimes reducing the pipe size by one grade can effectively address the issue of inaccurate measurements at low flows.
Metal tube float flowmeters offer good accuracy, but their price may be a bit higher. But it ultimately depends on the flow rate (relative to the pipe diameter); for high flow rates, an electromagnetic method can be used
Rotors, turbines, ultrasonic devices (some Doppler-type ones are relatively inexpensive); for larger diameters, electromagnetic or plug-in turbines can be used, with electromagnetic options being suitable in all cases. The vortex street seems to be a bit more expensive
What is the pipe diameter? What was said upstairs is very comprehensive
It might be due to the wide range of flow rates at the site; in other words, the flow meter sometimes operates in a nonlinear measurement region. If conditions permit, a weighing-based measurement method can be used to solve this issue.