Connect a Gas Cylinder
Move the replacement cylinder close to the analyzer and tether it into place. It is not necessary to
disconnect the gas line from the regulator or the analyzer.
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.
n
If the pressure is stable, proceed with the next step.
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If the pressure decreases, tighten the regulator connector nut until it becomes
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 starting to prevent contamination of the analysis gas sup-
ply.
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.
e. Reconnect the gas line to the regulator.
f. Use two 7/16 in. (11 mm) wrenches to tighten the gas line connection. Hold one wrench
fitting steady and the other to tighten the connector nut.
6. Set the analyzer pressure by doing the following:
a. Turn the Regulator Control knob clockwise until the low pressure gauge indicates the
appropriate pressure. See the Regulator Pressure Settings table in Connect a Gas
Cylinder.
b. Open the regulator Shut-off valve.
c. Open the gas cylinder Shut-off valve and flow gas for 10 to 30 seconds.
Replace a Gas Cylinder
TriStar II Plus Operator Manual
303-42800-01 (Rev M ) — Sep 2023
11 - 7
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