3.2.2 Calculation of Correction Factors For Mass Units

Occasionally, a customer will request a flowmeter calibrated in units of mass such as grams/min. or lbs/hour. In this case, another factor must be calculated in to compensate for the different densities of the gases. Calculate the factor as detailed above, then multiply this factor by the ratio of the specific gravity of the new gas to the specific gravity of the gas for which the flowmeter was calibrated. Since air has a specific gravity of 1.000, this will be just the specific gravity of the new gas when the flowmeter has been calibrated for air. Specifc gravities for various gases can be found on the chart on page 16 .

The factor would be calculated as follows:

CFm = (CF2/CF1) X (s2/s1)

CFm = conversion in mass units

CF1 = conversion factor of gas for which the flowmeter is calibrated CF2 = conversion factor of the gas being measured

s1 = specific gravity of gas for which the flowmeter is calibrated s2 = specific gravity of gas being measured

EXAMPLE: A flowmeter is calibrated for 100 grams per minute of nitrous oxide and it now has neon flowing through it. Divide the correction factor of neon (1.38) by the correction factor of nitrous oxide (.75), and multipliy by the ratio of the specific gravity of neon (.70) to the specific gravity of nitrous oxide (1.54): (1.38/.75) X (.70/1.54) = 0.836. This is the number that must be set per Section 2.5.4 for the display to automatically read out in grams per minute of neon.

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Teledyne Power Supply, 40 instruction manual Calculation of Correction Factors For Mass Units
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40, Power Supply specifications

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