Gravimetric method. 3.3.1. Metering a limited quantity of pure gas (CO or C3H8) by means of a gravimetric technique 3.3.2. The following gravimetric procedure may be used to verify the CVS system. The weight of a small cylinder filled with either carbon monoxide or propane is determined with a precision of ±0.
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Sources: Proposal for the 02 Series of Amendments to Regulation No. 40, Proposal for Amendments to Regulation No. 40