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We also use third-party cookies that help us analyze and understand how you use this website. Learning how a magnetic propane gauge works and using it regularly will help ensure you never run out of fuel unexpectedly. When you change colour with temperature, the bigger the temperature difference, the clearer the level is. This can be done by using a mixture of soap and water and looking for bubbling or hissing sounds at the connections. Say you have a #20 tank and you use it on a 30,000 btu grill. The result for this case (not pure component) is that the total pressure will drop as the more volatile component is vaporized at a higher rate. A magnetic propane tank gauge can help you save money on your fuel bill. But it does work ok for 20-lb tanks, IF you run at fairly high BTUs. This gauge indicates how many gallons of propane a tank contains, and is expressed as a percentage. The dip tube is fixed and set at length equal to 80% liquid level tank capacity. Had the same experience and h=this article told me why This senses any strange variation of the gas flow and will automatically lower the flow of gas down to next to nothing The generator suddenly starting is the strange variation and then My 7.5Kw generator starts, then quickly stops just as you described. I did read your post and understand I think the difference between a liquid gas vs petrol and how this relates to a gauge working, but still a little confused if the needle gradually goes down or just goes from full on green to yellow when propane level is low. Thats a key feature since those are some of the most important times to keep track of fluid levels. The magnet is not very strong. Additionally, a magnetic propane gauge is less prone to damage. The tubes are used to determine the level of the surface. This is to eliminate any air that may have gotten into the system. If your propane tank has no gauge, it can be frustrating to run out of propane in the middle of cooking dinner. Compare the gauge reading with the weight listed on the tank itself. The valve is connected to what is called a dip tube that goes into the container. Your magnetic propane gauge should come with a small magnet attached to the back. Papenmeier GmbH & Co. KG; LumiFloand MetaPlexare registered trademarks of L.J. I guess that is all that is required. As long as there is a two phase mixture (that is, as long as there is any liquid in the tank), the pressure will not change. When the liquid gets cold enough, the tank next to the liquid gets colder than the tank next to the air above the liquid level. So these gauges are next to worthless. I see there's a "customer" comment by the manufacturer that these are designed for use with 20-lb tanks.