Micromeritics TriStar II 3020 Operator's Manual page 254

Connecting Gases
4. Purge the air from the lines.
Regulator
shut-off valve
a.) Turn the regulator clockwise until the low pressure gauge shows a few pounds of pressure.
b.) Turn the regulator shut-off valve counterclockwise to open.
c.) Open the gas bottle shut-off valve to flow gas.
d.) Close the regulator shut-off valve to stop flow.
e.) Close the gas bottle valve.
5. Set the instrument pressure.
Regulator
shut-off valve
Regulator
control knob
a.) Turn the regulator control knob clockwise until the low-pressure gauge reads 15 psig 
(103 kPag).
b.) Open the regulator shut-off valve.
c.) Open the gas bottle shut-off valve and flow gas for 10 to 30 seconds.
d.) Close the gas bottle shut-off valve.
9-20
Low-pressure gauge
TriStar II 3020
Gas bottle
shut-off valve
Gas bottle
shut-off valve
302-42828-01 - Dec 2012