Altaros Compressor unit works on inlet pressure amplifiers principle. For these reasons it is necessary for its function source of pressurized air. As a source of compressed air may be used ordinary workshop compressor that provides at least 5 bar / 72 PSI and a maximum of 10bar / 145 PSI . Bottle filling speed depends on high pressure air and its amount supplied from the driving workshop compressor. For a better idea about the high pressure air filling speed we have prepared a table with real measurement for different types of workshop compressors, that differ in amount of supplied air quantity and volume of the outlet pressure and compressor load in %. This “Load” figure represents the ratio of time in%, when driving the compressor is in operation (For example 65% indicates that the compressor drive 65% of the time is in operation and 35% of its motor is stopped and pressurized air is consumed to drive only from the compressor air chamber). In the table are shown times for filling bottles of different sizes and pressures and also the amount of supplied air, in liters per minute, which is a value that can be used to calculate the time required for filling bottles of any size and the desired pressure difference. For illustration, here is an example:
Bottle which we want to fill has a capacity of 7 liters and the requirement to fulfill it from the pressure of 100bar to 300bar pressure.First, we calculate the total quantity of air required to fill the bottle by multiplying its air volume sizes of the differential pressures, namely 7 x L (300100 bar) = 1400L air at a pressure of 1 bar (atmospheric pressure). This result is then divided by the data in the table. When using these data:
Compressor Drive: Load 65% Supplied quantity from the booster compressor: 11.4 L / min / 0.40 cfm
We can calculate final time that required volume is divided by “Supplied quantity“, therefore
1400L /11,4 L/min = 122 minutes. Thus Filling 7 litres cylinders (from 100 to 300 bar) to desired pressure, it should take about two hours when using this drive compressor.
When we use different driving compressor with different Supplied quantity 8,8L/min then our filling time would be 1400L / 8,8L/min = 160min
This way you can calculate the approximate filling time for different air volumes, pressure differences and different driving compressors.
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Driving compressor: Schneider Bohemia: UNM 4101050 W
Input power 2,2kW / 3HP
2 cylinders
Max pressure. 10 bar / 145 PSI
Air intake 410 l/min / 15.5 cfm
Filling amount 295 l/min / 10.4 cfm
Realistically measured amount of airflow 350 l/min / 12.3 cfm
Driving compressor  Supplied quantity  Filling time for different airvolume and different pressure  
4l/42 cf 200300bar
(29004500 PSI) 
0,8l/8,5cf 100200bar
( 15002900 PSI) 
0,3l/3,2cf 10003000PSI


Load 100%  16l/min
0.55 cfm 
25min  6.5min  3,75min 
Load 65%  11,4l/min
0.40 cfm 
35min  8,5min  4,5min 
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Driving compressor: Hecht 2351
Input power 2,2kW / 3HP
2 cylinders
Max pressure 8 bar / 116 PSI
Air intake 400 l/min / 14.1 cfm
Realistically measured amount of airflow 250 l/min / 8.8 cfm
Driving compressor  Supplied quantity  Filling time for different airvolume and different pressure  
4l/42 cf 200300bar
(29004500 PSI) 
0,8l/8,5cf 100200bar
( 15002900 PSI) 
0,3l/3,2cf 10003000PSI  
Load 100%  8,8l/min
0.31 cfm 
45min  11min  5,7min 
Load 65%  5,3l/min
0.19 cfm 
75min  15min  8 min 
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Driving compressor: Scheppach HC 24
Input power 1,5 kW / 2 HP
1 cylinder
Max pressure 8 bar / 116 PSI
Air intake 220 l/min / 7.8 cfm
Realistically measured amount of airflow 125l/min / 4.4 cfm
Driving compressor  Supplied quantity  Filling time for different airvolume and different pressure  
4l/42 cf 200300bar
(29004500 PSI) 
0,8l/8,5cf 100200bar
( 15002900 PSI) 
0,3l/3,2cf 10003000PSI  
Load 100%  4,5l/min
0.16 cfm 
90min  19min  9,5min 
Load 65%  2,7l/min
0.095 cfm 
150min  30min  15,5min 