| Identification Numbers | ||
| First Digit | Succeeding Digits | |
| 0 | GCS (Top Module) | Sub-Module/Control Function |
| 1 | Mixer | Specific to Line/Control Loop/Device |
| 2 | Purifier | Specific to Column/Control Loop/Device |
| 3 | CO2 removal | Specific to Column/Control Loop/Device |
| 4 | Pump | - |
| 5 | Exhaust | - |
| 6 | Distribution | SDU* (In conjunction with 1st digit) / Flow Channel/Flow Cell |
| 7 | Distribution | SDU* (In conjunction with 1st digit) / Flow Channel/Flow Cell |
| 8 | Distribution | SDU* (In conjunction with 1st digit) / Flow Channel/Flow Cell |
| 9 | Analysis | - |
| *SDU = Sub Distribution Unit | ||