14
pressure of 200 bars. You have fifty-liter distribution bottles containing oxygen and helium and
a compressor with the output of 330 bars. Enter:
A: Air 24L 120
1: He 50L 200
2: O
2
50L 200
3: Air
300
D:
18.0/40.0 24L
200
and start the calculation. When the calculation is completed, the following data are displayed:
Disch.
to
79.5 bar
He to 159.5
bar
O
2
to
173.2 bar
Air
to
200.0 bar
meaning that the twin should be discharged to the pressure of 79.5 bars, then He added until
the pressure of 159.5 bars is achieved, then oxygen added to 173.2 bars and, finally, air added
to reach 200 bars. When the MODE key is pressed, the same result is displayed; however, it is
expressed in pressure to add or to discharge:
Disch.
-40.5 bar
Add
80.0 bar He
Add
13.7 bar O
2
Add
26.8 bar Air
or decrease the pressure by 40.5 bars, increase the pressure by 80 bars by adding helium,
add 13.7 bars of oxygen and 26.8 bars of air. The last mode is similar, but as it is designed for
gravimetric filling (using a chemical balance), the amount of gas is specified in kilograms:
Disch.
-1.2382 kg
Add
0.3392 kg He
Add
0.4669 kg O
2
Add
0.8230 kg Air
Please note that the solver takes into account the pressure drop in the gas charging bottles;
therefore it does not try to recommend adding oxygen to reach 200 bars (which would be
impossible anyway, given the limited oxygen supply); rather, it allows air to be partly discharged
and oxygen is only added to reach the realistic 173.2 bars, with the rest of the air to be added
by the compressor. At the same time, however, the solver saves the mix already contained in
Summary of Contents for HE/02
Page 1: ...MANUAL He O2 Analyzer ...
