Inficon XL3000flex - Set Equivalence Factor and Molar Mass

6 | Operation INFICON
58 / 108 XL3000flex-Operating-instructions-jina83en1-07-(2105)
Dynamic viscosity of test gas (helium or H
2
)
Dynamic viscosity of the equivalent gas
Absolute pressure of the test gas in the test object in bar
Absolute pressure of the equivalent gas in the test object in bar
For example
An air conditioning system is to be checked for leaks.
The system is first filled with 2 bar (absolute) helium and checked for leaks. Later the
plant will be filled with R134a. The operating pressure is 15 bar (absolute).
The dynamic viscosity of helium is 19.62 µPa*s.
The dynamic viscosity of R134a is 11.49 µPa*s.
In order to obtain an R134a equivalent leak rate display during the helium leak
detection, the following equivalence factor must be entered:
6.3.2.4 Set equivalence factor and molar mass
ü The equivalence factor is known. See also "Calculate equivalence factor [}57]".
ü The test gas used is specified (hydrogen or helium, mass 2, 3 or 4).
ü The molar mass of the equivalence gas you want to display is known.
1
Control unit: Settings > Set up > Operation modes > Equivalence rate
2
“Gas factor” button
ð (LD protocol: Command 469)
3
Select "Mass 2", "Mass 3" or "Mass 4" according to your test gas.
ð If the test gas is set to helium, the window "Equivalent Gas Factor He" opens.
4
Set the equivalence gas factor. In the example (see “Calculate equivalence
factor [}57]“) for 127:
5
Control unit: Settings > Set up > Operation modes > Equivalence rate
6
“Molar mass" button
ð (LD protocol: Command “470”)
7
Select "Mass 2", "Mass 3" or "Mass 4" to match your test gas as described
above.
ð If the test gas is set to helium, the window "Molar mass equivalent gas He"
opens.