Gas Supply Hardware - Micromeritics TriStar II Plus Pre-Installation Manual

Gas Supply
with copper. Copper or stainless steel gas lines are also available in 20 ft. (6 m) lengths from
.
Micromeritics
Gas supply lines made of materials other than copper or stainless steel may cause
operational problems.
DO NOT:
• Use gas bottles with less than 200 psig (1378.9 kPag) pressure.
• Use any other gas lines to connect the gas supply to the instrument.
• Use gas purifiers; they can cause operational problems.

Gas Supply Hardware

We recommend that the gas regulators to be used with the TriStar II Plus analyzer from Micromeritics
be purchased from Micromeritics. The regulators Micromeritics provides have been carefully evalu-
ated and tested to provide superior performance.
If you choose to use regulators from a source other than Micromeritics, please keep in mind that many
commercially available gas regulators lack key features which are required for gas adsorption mea-
surements. These four vital criteria must be met:
• Cleanliness. Clean regulators designed specifically for high-vacuum service are required. Other
regulators often contain elastomeric material or oils which can contaminate the gas.
• High Stability. Excess pressure at the gas inlet ports to the instrument can interfere with accurate
gas dosing and flow rates. The combined change in the outlet pressure from the gas regulator, as the
gas cylinder pressure decreases or as the flow rate stops, should not change more than 5 psig (34.4
kPag) from the selected setting. When the instrument is idle for an extended period of time, such as
8 to 10 hours, this same stability of gas delivery pressures should be achieved.
• Range of Pressure. The regulator output must operate from 0 to 30 psig (207 kPag).
6
TriStar II Plus Preinstallation Instructions and Checklist
303-42870-01 (Rev B) - Mar 2015