Steps:

Note: DO NOT CONNECT the purity meter to the white tube until you reach to Step (6).

1. Connect the regulator (with the relief valve) at the tube trailer, and perform a leak-check with snoop.
2. Open the main hand valve from the tubes, regulate ~50psig, and open the green valve of that portable manifold connected at the tube trailer.
3. Check whether the rotatable hand valve is closed (see the picture).
4. Open MV11 and then bleed from MV12 a few times (open-close MV12 multiple times to flush), then leave the MV12 cracked open (to have only a little flow).
5. Connect the white tube's one end to the port after MV12 and let gHe flush through the other end before connecting to the purity meter.
6. Connect the other end of the white tube to the purity meter inlet while there is a little gHe flow.
7. Measure the purity, and take a picture of the reading, send it to the target-expert (or to the target-group), make a elog entry (with date, time, location, and purity).