Micromeritics Gemini VII 2390a Operator's Manual page 246

Connecting Gases
2. Attach the gas regulator to the gas bottle connector. Hand-tighten the nut then use an appropriate
wrench to tighten an additional 3/4 turn.
Overtightening the fitting may cause a leak.
3. Check for leaks at the high-pressure side of the regulator and in the connector.
Regulator
control knob
a.) Turn the regulator control knob fully counterclockwise.
b.) Slowly open the gas bottle shut-off valve then close it.
c.) Observe the pressure on the high-pressure gauge.
• If the pressure is stable, proceed with the next step.
• If the pressure decreases, tighten the regulator connector nut until it becomes stable. 
4. Purge the air from the lines.
Regulator
shut-off valve
9-20
HIgh-pressure Gauge
Gemini VII
Gas bottle
shut-off valve
Regulator
connector nut
Gas bottle
shut-off valve
239-42828-01 - Dec 2012