Micromeritics GEMINI VII Operator's Manual page 198

10 Troubleshooting
Connect a Gas Cylinder
Regulator Pressure Settings
Analyzer
Gemini
Exceeding the maximum recommended air pressure could cause personal injury or
damage the instrument.
Move the replacement cylinder close to the analyzer and tether it into place.
1. Use an appropriate cylinder wrench to remove the protective cap from the replacement gas
cylinder.
2. Place the protective cap in a secure location. It will be needed to recap the gas cylinder
when it is depleted and replaced.
3. Attach the gas regulator to the gas cylinder connector. Hand tighten the nut, then use an
appropriate wrench to tighten an additional 3/4 turn.
Over-tightening the fitting may cause a leak.
4. Check for leaks at the high pressure side of the regulator and in the connector.
a. Turn the regulator control knob fully counter-clockwise.
b. Slowly open the gas cylinder shut-off valve, then quickly close it.
c. Observe the pressure on the high pressure gauge for approximately one minute.
If the pressure is stable, proceed with the next step.
n
If the pressure decreases, tighten the regulator connector nut until it becomes
n
stable. If the pressure does not remain stable, remove the regulator and clean all
contacts at the regulator connection, then reinstall the regulator.
5. Purge the air from the lines by doing the following:
Purge the regulator before proceeding to prevent contamination of the analysis gas
supply.
a. Open the gas cylinder valve to pressurize the regulator, then close the valve.
b. Adjust the Pressure Control knob to approximately 5 psi.
c. Turn the regulator Shut-off valve counter-clockwise to open. Allow gas to flow until both
gauges read approximately zero.
d. Close the regulator Shut-off valve to stop gas flow.
10 - 12
Gauge should indicate
15-18 psig (103 - 124 kPag)
Gemini VII Operator Manual
239-42828-01 (Rev H ) — May 2021