This ensures that only the required amount of counting gas is
consumed and that the cylinder valve need not be opened and
closed after each measurement. The rotameter shows a gas
flow of 0 - 3000 cm³/min. For measurement, the gas flow should
be set to 2000 cm³/min.
Caution! The value on the rotameter scale has to be multiplied
by 10.
Figure 7.20: Schematic layout of the gas cycle
Double pressure reducer -> valve
Valve -> rotameter (bottom)
Rotameter (top) -> probe
Setting the gas flow
1. The tubing is connected correctly. The probe is in the hold-
er on the console, so that the gas valve is closed. The
double pressure reducer is closed.
2. Lift the probe from the console to open the gas valve, so
the gas can flow through the rotameter.
3. Open the tap of the P10 gas cylinder.
4. Slowly open the double pressure reducer and adjust it such
that the rotameter indicates 200. Keep in mind that it takes
some time until the gas has reached the rotameter.
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