{"id":9693,"date":"2016-03-31T16:30:55","date_gmt":"2016-03-31T14:30:55","guid":{"rendered":"https:\/\/www.gok-blog.de\/2016\/03\/31\/does-the-pressure-regulator-gauge-show-the-filling-level-of-the-lpg-cylinder\/"},"modified":"2026-07-29T09:22:38","modified_gmt":"2026-07-29T07:22:38","slug":"does-the-pressure-regulator-gauge-show-the-filling-level-of-the-lpg-cylinder","status":"publish","type":"post","link":"https:\/\/www.gok-blog.de\/en\/does-the-pressure-regulator-gauge-show-the-filling-level-of-the-lpg-cylinder\/","title":{"rendered":"Does the pressure regulator gauge show the filling level of the LPG cylinder?"},"content":{"rendered":"

Many users believe that the pressure gauge on the gas regulator shows the filling level of the gas cylinder \u2014 similar to a fuel gauge in a car. But this is a misconception: what the gauge actually<\/em> shows, and what alternative there is for measuring the volume precisely, you will learn in this article.<\/p>\n

Does the pressure gauge on the gas regulator really indicate how much gas is left in the cylinder? Experts are asked this question regularly \u2014 because many users assume that the needle gives a clue as to how much liquefied gas is still in the bottle. In fact, this misunderstanding frequently leads to unnecessary replacements or even operational disruptions.
\nIn this article you will learn what the pressure gauge really<\/em> measures, why it is not suitable as a fill\u2011level indicator, and what practical alternative exists to keep an eye on your gas supply.<\/p>\n

<\/span>What the pressure gauge on the gas regulator measures \u2014 and what it does not<\/span><\/h2>\n

The pressure gauge displays the so\u2011called incoming pressure<\/em> at the pressure regulator. This is the gas pressure flowing from the gas cylinder towards the regulator and present at its inlet. Put simply: as long as there is liquefied gas in the cylinder, this pressure remains more or less constant.<\/p>\n

It is only when no liquefied gas is left to evaporate that the pressure drops \u2014 then very rapidly. In that scenario the gauge\u2019s needle usually falls quickly from about 6 bar<\/strong> towards 0<\/strong>. However, you cannot draw any conclusions about the filling level during that phase.<\/p>\n

\"Pressure<\/a>
Pressure gauges measure the inlet pressure at the pressure regulator. However, no conclusions about the fill level can be drawn from this at this stage.<\/figcaption><\/figure>\n

<\/span>Why you cannot read off the filling level from the pressure<\/span><\/h2>\n

Liquefied gas \u2014 i.e. propane, butane, or mixtures thereof \u2014 is usually withdrawn from the cylinder in the gaseous state. If there is still enough liquefied gas in the cylinder, from which a vapour\u2011space can form, then the pressure remains largely, regardless whether the bottle is half full or almost empty. Only when all liquefied gas has vapourised does the pressure in the gas space fall. Physically, then, a continuous indication of filling level via pressure is not possible.<\/p>\n

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<\/span>Typical misinterpretations in practice<\/span><\/h2>\n