Micromeritics ACCUPYC II 1345 Series Installation Instructions And Checklist page 33

Do not overtighten the fittings. Doing so can collapse the brass fitting and cause a leak.
3. Purge the regulator and inlet tubing to prevent contamination of the analysis gas.
a. Turn the regular shut-off valve clockwise to close.
b. Turn the pressure regulator control knob counter-clockwise to open.
c. Slowly turn the gas cylinder shut-valve counter-clockwise to open, then quickly close it.
d. 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.
Ensure the gas supply equipment is adequately vented before performing the next step.
e. Turn the pressure regulator control knob clockwise until the low pressure gauge indicates
19.500 psig (134.445 kPag).
f. Turn the regulator shut-off valve counter-clockwise to open.
g. Turn the gas cylinder shut-off valve counter-clockwise to open. Flow gas for 10 to 30
seconds, then close the valve.
h. Turn the gas regulator shut-off valve clockwise to close
i. Attach the other end of the copper tubing to the gas inlet on the rear panel of the pycno-
meter. Remove the inlet plug that shipped with the pycnometer.
4. Turn the nut on the tubing clockwise until it is finger tight. Then use a 7/16 in.(11 mm) wrench
to tighten the nut an additional 1/4 turn.
5. Open the gas cylinder and regulator shut-off valves.
6. 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.
AccuPyc II 1345 Installation Instructions and Checklist
134-42875-02 (Rev A) — Jan 2021
Guidelines for Connecting Gases
2 - 11