How to purchase on-site magnetic flap float balls
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The float ball on site has been corroded and damaged. The seller said it’s necessary to know the polarity of the float ball – what does polarity mean? How to interpret it?
Ask the manufacturer! Generally, only the density of the liquid is asked.
Since the magnetic flip columns used for display are magnetic, the part of the liquid that is at different levels turns red; therefore, it is necessary to know the magnetic poles at the site. Furthermore, if the float is corroded, it indicates a problem with the magnetic flip switch itself; it is recommended to replace it with a new one. It is also necessary to take into account the properties of the medium present on site and select a magnetic flip switch made of an appropriate material
There is a magnet inside the float, and the poles of this magnet are the N pole and the S pole. For different manufacturers, the installation direction of the N pole and the S pole varies; in some cases they are installed vertically, while in others they are installed horizontally. This is why the manufacturer asks you to determine the polarity of the float ball: you can use two magnets to identify the polarity of one magnet, and then use that known polarity to determine the polarity of the magnet inside the float ball. The principle for determination is that like poles repel each other while opposite poles attract.
This matter of yours is rather difficult to handle. If it is a side-mounted magnetic flap, the float is usually cylindrical in shape; its dimensions, namely its length, can affect the accuracy of measurements. You also need to know the diameter of the cylinder, which is generally about 5 mm smaller than the inner diameter of the tank. As for welds, both metal floats and those made of polytetrafluoroethylene have welds. Generally speaking, the magnetic column itself is non-magnetic, but you need to inform the manufacturer of the exact location of the magnet inside the float. The magnet is usually located in the upper part of the float, as there is a certain distance between the center line of the lower connection flange and the lower flange of the tank. In other words, when there is no liquid level and the float sinks to the bottom, the position of the magnet aligns with the zero point. That’s all I can say; you’ll need to figure out the rest on your own
I don’t understand what upper and lower magnetic poles mean; just buy one randomly, right? If the poles are reversed, just turn it around, that’s it.