Gas Requirements

The pycnometer uses helium or nitrogen (99.995% pure or better) to provide rapid, accurate analyses. The cylinder containing helium must be fitted with a gas regulator set for 19-23 psig (131-159 kPag). The pressure input to the pycnometer should never be greater than 25 psig (172 kPag). Excessive pressures waste gas due to a protection device contained in the pycnometer that vents the pycnometer to atmospheric pressure if pressure exceeds 35 psig (241 kPag). This protection device is not installed on 2000 cm3 or high pressure units.

  Tank pressure should be at least 200 psi above regulator pressure.

The High Pressure sample chamber configuration inlet pressure should never be greater than 520 psig (3580 kPag); there is no pressure relief.

Other inert, dry gases can also be used and may be more applicable for some applications.

 
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