Method How can you tell how much gas is still left in a cylinder?

[Predestinated]

Exit-Bag / Inert Gas: I will use argon.

But how can you tell how much gas is still left in a cylinder?

 

[BobMorane]

Compare its actual weight with normal weight. Normally, the tank's weight should be mentioned somwhere. So rest tanks weight to the 2 mesures and then substract : Normal Weight - Actual weight = Weight missing and then divide Weight missing/Normal weight * 100% .That will tell you the % of weight of gas missing from the tank. You just multiply this * (Normal weight - tank weight) and that should give you a quantity of gaz missing. From there you can guess how much gas you have left. If it's too complicated you can send me a photo and ill give it a try.

 

[ContinuousJump]

@bobmorane 's method is certainly valid.

In addition, cylinders almost always use regulators which almost always have pressure gauges. You know how much gas the tank originally contained by it's specifications, including volume and its original pressure, which are both almost always industry standards. And you know how much gas you have left by measuring the current pressure with the pressure gauge.

Remember, according to the recommendations of the PPH, you need a minimum of 15 minutes at 15 liters per minute of flow. Or, you need an absolute minimum of 225 liters of uncompressed argon remaining.

 

[Predestinated]

Compare its actual weight with normal weight. Normally, the tank's weight should be mentioned somwhere. So rest tanks weight to the 2 mesures and then substract : Normal Weight - Actual weight = Weight missing and then divide Weight missing/Normal weight * 100% .That will tell you the % of weight of gas missing from the tank. You just multiply this * (Normal weight - tank weight) and that should give you a quantity of gaz missing. From there you can guess how much gas you have left. If it's too complicated you can send me a photo and ill give it a try.

I only have an "analog" scale. Is that sufficient or do I need a digital scale, which is more precise?

 

[BobMorane]

I only have an "analog" scale. Is that sufficient or do I need a digital scale, which is more precise?

analog should be fine