Gas Connection
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These instructions are for connecting inert gases only. Follow the safety procedures
used by your laboratory for connecting hazardous gases. |
- Attach an appropriate regulator to the gas cylinder or gas line, then tighten with a wrench. Leave the gas bottle shutoff valve closed until instructed otherwise.
- Attach the gas inlet line to the regulator, reducer fitting, or regulator expansion.
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It is important to use the inlet tubing supplied with the analyzer. Gas lines made
of materials other than copper or stainless steel can cause operational problems as
well as inaccurate data. |
If Regulator has... |
Then... |
1/4 in. outlet |
Attach the reducer fitting to the outlet of the regulator shutoff /
isolation valve. |
Tighten the nut finger tight, then 1-1/4 turns with a wrench. |
Continue with the steps given for the 1/8 in. outlet. |
1/8 in. outlet |
Insert the gas tubing into the fitting. |
Enure the tubing is seated fully inside the fitting. |
Tighten the nut finger tight. |
While holding the fitting body steady, tighten the nut with a
wrench 3/4 turn. |
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Do not overtighten the fittings. Doing so can collapse the brass fitting and cause a
leak. |
- Purge the regulator and inlet tubing to prevent contamination of the analysis gas.
- Turn the regular shutoff valve clockwise to close.
- Turn the pressure regulator control knob counter-clockwise to open.
- Slowly turn the gas cylinder shutoff valve counter-clockwise to open, then quickly close it.
- Observe the high pressure gauge.
If the pressure decreases, tighten the nut connecting the regulator to the gas cylinder. If the pressure is stable, proceed to the next step.
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Ensure the gas supply equipment is adequately vented before performing the next
step. |
- Turn the pressure regulator control knob clockwise until the low pressure gauge indicates 19.500 psig (134.445 kPag).
- Turn the regulator shutoff valve counter-clockwise to open.
- Turn the gas cylinder shutoff valve counter-clockwise to open. Flow gas for 10 to 30 seconds, then close the valve.
- Turn the gas regulator shutoff valve clockwise to close
- Attach the other end of the copper tubing to the gas inlet on the rear panel of the pycnometer. Remove the inlet plug that shipped with the pycnometer.
- Turn the nut on the tubing clockwise until it is finger tight. Then use a 7/16 in.(1 mm) wrench to tighten the nut an additional 1/4 turn.
- Open the gas cylinder and regulator shutoff valves.
- Turn the regulator control knob until the low pressure gauge indicates 21.5 psig (148 kPag). For a high pressure sample chamber configuration, set regulator pressure 20 psi above cycle and fill pressure.