In a nutshell, a pressure gauge measures the physical pressure of a medium. In the case of LPG systems, you can therefore only draw conclusions about the fill level of the cylinder from the pressure gauge display in one single situation.
First, you have opened the gas cylinder valve. Yet the needle on the pressure gauge is still at zero? A sure sign that the LPG cylinder is empty and, as we mentioned, the only case in which the pressure gauge reflects the correct filling level of the gas cylinder. The pressure gauge needle and filling level are at zero!
Checking for leaks using the pressure gauge
In normal operation, the pressure gauge affixed to the inlet side of the pressure regulator displays the pressure at the inlet of the fitting (cylinder pressure). In these kinds of systems, the pressure gauge simply allows you to check for leaks.
So, if you know that the pressure gauge only displays pressure, it must also be clear to you that a pressure gauge simply can’t show you the filling level of the gas cylinder. It’s true, this can be quantified in a several units of measurement, such as kilograms or percent by volume; but certainly not in pressure.
Replacing the cylinder = check
Each time you change the cylinder, you need to check the entire LPG system for leaks. You can find instructions for checking for leaks either in the assembly and operating manual or on the yellow tag on the pressure regulator.
Digital filling level monitoring
If you are interested in filling level monitoring for your gas cylinder, we can recommend the Senso4s PLUS. The Senso4s measures the weight of the LPG in the gas cylinder, and then forwards this information to your smartphone or tablet via Bluetooth.
The app of the same name then displays the data visually and in graphic form. The user can also set an alert for when the filling level drops below a defined value.