This test is made to check that there are no internal leakage between dosage volumes and dosage selector.

1. Make sure the apparatus is depressurised and the pressure is relieved (reserve gas valve open, by-pass performed).
2. Set the dosage selector in the RED position.
3. The dosage pressure gauge should still be mounted.
4. Pressurise the IS-MIX.
5. Check the dosage pressure gauge after 1 minute. Approved value: 0+0.1 bar.
6. Remove the dosage pressure gauge and refit the plug on the dosage volume.