One For All HFC-302 Manuel d'utilisateur Page 26

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300-302 Series Page 26 of 31
being used to measure the flow of propane. The reading from the meter is multiplied by the GCF for
propane divided by the GCF of air.
20 * (0.3499/1.0015) = 6.9875
To calculate a target setting (20 sccm) to achieve a desired flow rate of propane using a meter calibrated to
air, invert the ratio above and multiply.
20 * (1.0015/0.3499) = 57.2449
Gas conversion factors can be found at the Hastings Instruments web site.
http://www.teledyne-hi.com
Follow the link to Mass Flow Products and then to Gas Conversion Factors.
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