Flow factor and conversion
To determine which model is suitable for process gases other than N2, the Full Scale (FS) flow must be multiplied by the below-mentioned 'flow factor'. Note: This factor may be different for a flow meter or a flow controller.
The high-accuracy on-board FLUIDAT gas database ensures best in class conversion from N2 to the customer gas. When converting one gas to another, a small uncertainty is introduced. Although gas properties and conversion model are very accurate, mechanical tolerances may cause slight deviations from the theoretical conversion values. Therefore and additional uncertainty [%Rd] is applied to the accuracy specification. When the best accuracy performance is required, calibration on actual process gas can be performed.
Download this table with visualisation of the flow range for each gas (4 pages: 0,5/2/5/20 ln/min)
| Name |
Gas formula |
Flow factor MFM |
Flow factor MFC |
Conversion uncertainty |
Remarks |
| Acetylene |
C2H2 |
0,6 |
0,6 |
±1,5% Rd |
|
| Air |
Air |
1 |
1 |
none |
|
| Allene |
C3H4 #1 |
0,4 |
0,4 |
±1,5% Rd |
|
| Argon |
Ar |
1,3 |
0,8 |
±1,5% Rd |
|
| Carbon dioxide |
CO2 |
0,7 |
0,7 |
±1,5% Rd |
max. 10 bar |
| Carbon monoxide |
CO |
1 |
1 |
±1,5% Rd |
|
| Cyclopropane |
C3H6 #1 |
0,4 |
0,4 |
±1,5% Rd |
|
| Deuterium |
D2 #1 |
1 |
1 |
±1,5% Rd |
|
| Ethane |
C2H6 |
0,5 |
0,5 |
±1,5% Rd |
|
| Ethylene |
C2H4 |
0,6 |
0,6 |
±1,5% Rd |
max. 10 bar |
| Helium |
He |
1,4 |
1,4 |
±1,5% Rd |
|
| Hydrogen |
H2 |
1 |
1 |
±1,5% Rd |
|
| Krypton |
Kr |
1 |
0,6 |
±1,5% Rd |
|
| Methane |
CH4 |
0,8 |
0,8 |
±1,5% Rd |
|
| Neon |
Ne |
1,4 |
1,2 |
±1,5% Rd |
|
| Nitrogen |
N2 |
1 |
1 |
none |
|
| Nitrous oxide |
N2O |
0,7 |
0,7 |
±1,5% Rd |
|
| Oxygen |
O2 |
1 |
0,9 |
none |
|
| Perfluoropropane |
C3F8 |
0,15 |
0,15 |
±1,5% Rd |
max. 10 bar |
| Propylene |
C3H6 #2 |
0,4 |
0,4 |
±1,5% Rd |
max. 10 bar |
| Propane |
C3H8 |
0,3 |
0,3 |
±1,5% Rd |
|
| Propyne |
C3H4 #2 |
0,4 |
0,4 |
±1,5% Rd |
|