Micromeritics ACCUPYC III Pre-Installation Instructions page 22

2 Pre-installation Instructions
G S H
AS UPPLY ARDWARE
Micromeritics recommends the gas regulators to be used with the analyzer be purchased from
Micromeritics. The regulators Micromeritics provides have been carefully evaluated and tested to
provide superior performance.
If purchased 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 measurements.
These vital criteria must be met:
Cleanliness. Clean regulators designed specifically for high-vacuum service are required.
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Other regulators often contain elastomeric material or oils which can contaminate the gas.
High stability. Excess pressure at the gas inlet ports to the analyzer can interfere with accur-
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ate gas dosing and flow rates. The combined change in the outlet pressure from the gas reg-
ulator, 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 analyzer is idle for an exten-
ded period of time, such as 8 to 10 hours, this same stability of gas delivery pressures should
be achieved.
Suitable sub-assemblies. The regulator must have a shutoff or outlet isolation valve com-
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patible with 1/8 in. or 1/4 in. Swagelok compression fittings.
To purchase regulators from Micromeritics, contact your local Micromeritics Sales
Representative.
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AccuPyc III Pre-installation Instructions and Checklist
135-42870-01 (Rev -) — Nov 2023