Level gauge selection
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There is a cement tank with a mixer. The depth is approximately 2 meters; the medium is the filtrate from the acidic slag slurry resulting from sulfidation in a smelting plant, with a pH value of 1–5. The solid content is unstable, and it is necessary to measure the liquid level for pump interlock purposes. The accuracy can be low, but stability is important. Radar and ultrasonic level gauges are options, but in the far northwest, the probes freeze over in winter and become unusable. Choose a float level gauge; with capacitive (RF) level gauges, sulfide scales can attach to the guide rod and affect measurement accuracy. Are there any other good solutions for level measurement?
This post was last edited by Dexson Instruments on 2019-4-3 15:51 – No solution
The process conditions are too stringent. Is it permissible for its liquid level to fluctuate continuously, as per the process requirements?
In the material tank, first insert a pipe with an inner diameter of over 50 mm, then lower the probe into the pipe while keeping it suspended – this way, the effects of stirring disturbances can be eliminated directly.
The liquid level itself fluctuates during stirring; yet stability is also required, which makes it difficult to choose! Putting that factor aside, if it is a surface pool, a single-flange pressure-type level gauge can be considered. If it’s a completely underground pool, have the civil engineering team add a cover. In that case, ultrasound or radar can be considered.
A single-flange level gauge, in my personal opinion.
Try a top-mounted magnetic flap with a float at the bottom
I’ve tried it; it freezes frequently. As soon as stirring started, the rod bent and got stuck. Adding a stabilizing waveguide doesn’t work either.
What is required is stability of the level gauge, not stability of the liquid level. It definitely won’t work if it goes to full scale one moment and stays fixed at a certain value like in a radar. It already has a cover; in winter, especially at night, the reading stays at several dozen millimeters without any change. When the cover is removed, there’s fog everywhere. Upon taking the radar apart, a thin layer of ice was found on the probe – removing that layer resolved the issue, but the ice formed again within half an hour.