Problems with electromagnetic flowmeters and radar level gauges
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1. There is an electromagnetic flowmeter used to measure sulfuric acid. The first time, 5 T/H of the medium was added, with an acid content of 6; the second time, another 5 T/H was added, with an acid content of 7. The process team claims that the flowmeter is inaccurate. What should be done? 2. The tank is equipped with a stirrer and contains a large amount of steam; moreover, the medium sticks to the sensor due to the action of the stirrer. How should a radar level gauge be modified in such a situation?
1. Attach a picture of the installation location; otherwise it’s hard to say, as any reason could be possible. You’re saying it’s related to flow rate; the process parameters aren’t certain. By how much approximately? 2. I don’t know how large your container is; if it’s difficult to determine the liquid level, using a weighing module might be a better option.
Um, first of all, is it 5t/h or 5t? Similarly, at 5 t/h, the amount varies depending on the time. Second, what are you measuring electromagnetically? What’s your medium? How much medium is there? Do you know how much the difference is between PH6 and PH7?
The question is quite professional; I’ve brought a small stool to learn about it
What is the height of the tank for the level gauge? How many more are there for the stirrer blade brackets? How many layers of leaves are there? What about the measuring medium? Side mounting or top mounting? Which radar level gauge should be chosen, contact type or non-contact type?
1. Why can the inaccuracy of a flow meter be determined solely based on its acid content? These instruments can all be calibrated; could you provide more detailed information on this? 2. When using a radar level gauge in a storage tank, if there is a large amount of steam or viscous substances present, the readings are likely to be inaccurate, resulting in errors in the liquid level measurement. Diaphragm or bubble level gauges might be a better option, but I’m not sure whether your storage tanks are under pressure
Thank you all for your responses. 1. Radar level gauge: The radar level gauge is a Rosemount 5401 model. It is used for measuring levels in a tank that is 3.5 meters high; the medium inside the tank is viscous, and a large amount of steam is generated during processing. The agitator has two layers of blades. I’m wondering whether it would be possible to use PTFE pipes to create a wave-guiding isolation device for the sensor of the radar level gauge – would that work? 2. Electromagnetic flowmeter: Hydrochloric acid was added in amounts of 5 tons each time, using the same water, yet the acid concentration differed. The laboratory confirmed that there was no problem whatsoever; the diameter of the flowmeter pipe, its coefficients, and its grounding were all fine. The only issue was that the flowmeter was installed at the top of the pipeline, and although the curves appeared stable, the readings were inaccurate. Thank you all for your help
Hello, for question 1, I recommend using a guided wave radar level gauge, as the information you provided indicates that steam is present inside. Guided wave radar level gauges are effective at suppressing steam and foam. However, attention should be paid to the mixer. I’m not quite sure about question 2.
With a guided wave radar level gauge, a guided wave tube needs to be installed, and it’s no longer possible to do so now
There is a mixer, installation constraints; it seems that guided-wave radar won’t work； 5401: No waveguide is required. If the liquid level is inaccurate, is there a short pipe with a flange at the bell mouth? Is the beam angle reaching the tank wall? Stirrer suppression setting? Was zero-scale setting performed and online debugging carried out? It’s best to take a look at the installation diagram...
The level gauge can adopt an external cover, such as an ultrasonic level gauge. The flow meter needs to be calibrated!