Is it possible to estimate how much gas is left in a 7kg calor cylinder by weighing it, assuming the weights when full and empty are going to be the same each time. If so, does anyone know these weights, please?
Thanks
g
Thanks
g
calor gas - estimating how much left by weight
- Thread starter g1
- Start date
Its been a long time but here goes.
There should be several figures stamped on the neck of the cylinder. One should be the net weight (cyl m.t.)& tare wt. (cyl full). If you weigh the cyl it will tell you how much wt. of gas is in the cyl.
Personally I just take 2 cyls. with me 13 kg & 4.5kg propane red (can be used all year round unlike butane blue can only be used in temps. above 5 degrees C). When one runs out just change over.
With Calor gas the bigger the cyl. you buy the cheaper it work out.
Graham W.
There should be several figures stamped on the neck of the cylinder. One should be the net weight (cyl m.t.)& tare wt. (cyl full). If you weigh the cyl it will tell you how much wt. of gas is in the cyl.
Personally I just take 2 cyls. with me 13 kg & 4.5kg propane red (can be used all year round unlike butane blue can only be used in temps. above 5 degrees C). When one runs out just change over.
With Calor gas the bigger the cyl. you buy the cheaper it work out.
Graham W.
15Kg gross, 7 Kg of Gas. 8Kg empty bottle
g
A 7 kg bottle of gas weighs 15 kg gross which means you have 7 kg of gas and the bottle itself weighs 8 kg making 15 kg
g
A 7 kg bottle of gas weighs 15 kg gross which means you have 7 kg of gas and the bottle itself weighs 8 kg making 15 kg
Hello g,
I like your short and simple user name!
Not with standing Graham W's aversion to 'bottles' I have read his posting about the tare weight, I understand what he is saying I am not sure it adequately describes the process.
My method: weigh the gas bottle and note the reading,
Look for the Tare weight of the gas bottle, and deduct that from the previous reading - result is the weight of gas left in the bottle.
Not all empty bottles weigh the same, so for accuracy you must check the Tare weight of each bottle.
Incidentally Definitions
'A cylinder' is the description of a shape that has a constant radius from a central axis.
'A bottle' is container that can be closed.
I like your short and simple user name!
Not with standing Graham W's aversion to 'bottles' I have read his posting about the tare weight, I understand what he is saying I am not sure it adequately describes the process.
My method: weigh the gas bottle and note the reading,
Look for the Tare weight of the gas bottle, and deduct that from the previous reading - result is the weight of gas left in the bottle.
Not all empty bottles weigh the same, so for accuracy you must check the Tare weight of each bottle.
Incidentally Definitions
'A cylinder' is the description of a shape that has a constant radius from a central axis.
'A bottle' is container that can be closed.
A few years ago I looked at a Patent application by a French engineer who had designed a "gas bottle scale".
This weighing scale gave a reasonably accurate "Full to Empty" reading of the bottle contents, was about as thick as a paperback book and sat under the bottle in the gas locker.
The different types and sizes of bottles (butane 4.6 kg to propane 13 kg or whatever) were addressed by different coloured (rated) springs fitted inside the balance by the caravaner.
It didn't go into production - a large production run would be needed, costs would still high, and it was felt that not enough people would buy it - especially as the first translucent (see-through) gas bottles were introduced in Holland that year (2003) and you don't need a balance if you can see how much gas remains.
Robert
This weighing scale gave a reasonably accurate "Full to Empty" reading of the bottle contents, was about as thick as a paperback book and sat under the bottle in the gas locker.
The different types and sizes of bottles (butane 4.6 kg to propane 13 kg or whatever) were addressed by different coloured (rated) springs fitted inside the balance by the caravaner.
It didn't go into production - a large production run would be needed, costs would still high, and it was felt that not enough people would buy it - especially as the first translucent (see-through) gas bottles were introduced in Holland that year (2003) and you don't need a balance if you can see how much gas remains.
Robert
There is another method, This used ultrasonic transducers in close contact with the bottom of the bottle. Just like a submarine, a transducer sends out a high frequency pulse, which traverses the thickness of the bottom wall of the bottle and into the liquefied gas. At every surface the sound wave meets, the change in density of the substance causes some of the sound wave to be reflected back to the transducer - so to get one from the inside wall of the gas bottle, the top of the liquefied gas and the top of the vapour- the top of the bottle.
By measuring the time it takes for the waves to be reflected back to the transducer, the various surfaces can be accounted for. The metal of the bottle has a very short time interval, the top of the liquefied gas is quite a lot slower, and the inner surface of the top of the bottle will be significantly weaker and slower.
By filtering out the short time interval signal and ignoring the low energy reflections from the top and sides of the bottle, the remaining signal is the reflection from the top of the liquefied gas. It is not too difficult with modern electronics to turn that into a usable indication of how full or more accurately how close to empty the bottle is.
I believe that Truma market a product that uses a similar principal.
By measuring the time it takes for the waves to be reflected back to the transducer, the various surfaces can be accounted for. The metal of the bottle has a very short time interval, the top of the liquefied gas is quite a lot slower, and the inner surface of the top of the bottle will be significantly weaker and slower.
By filtering out the short time interval signal and ignoring the low energy reflections from the top and sides of the bottle, the remaining signal is the reflection from the top of the liquefied gas. It is not too difficult with modern electronics to turn that into a usable indication of how full or more accurately how close to empty the bottle is.
I believe that Truma market a product that uses a similar principal.
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