Equipment Settings 55
For a custom gas, the molecular mass, as well as the dynamic viscosity (in Pa ꞏ s)
must be entered.
In the
EDIT GAS submenu you can now enter the TRIGGER value in the refrigerant equi-
valent value.
A set of parameters (refrigerant type, fill pressure, helium concentration) can also be
saved as user gas.
In the measurement screen the gas type will now be displayed as refrigerant equiva-
lent leak rate (e.g. R134a <- He).
Trigger and unit of measurement
In the
EDIT GAS X info page the TRIGGER & UNIT sub-menu page will open by selecting
the corresponding line item. You can change the trigger level setting by the use of
the left
UP and DOWN keys. The correct settings must be confirmed by the OK button.
You can leave the submenu without making any changes by using the
ESC key.
The leak rate unit can be changed by the use of the right
UP and DOWN keys,
Available leak rate units include mbar l/s, Pam
3
/s, Torr l/s, atm cc/s, g/a, oz/yr,
lb/yr, ppm.
Default value: 2 x 10
-5
mbar l/s
Fig. 44 Setting a refrigerant correction factor for a custom gas
Fig. 45 Editing parameters for refrigerant equivalent leak rates
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