Flowmeter Conversion Factors for Chemical Adsorption

The gas flowmeter on the front panel displays the gas flow rate for air in standard cubic centimeters per minute (sccm). To obtain the actual flow rate for gases other than air, divide the displayed gas flow rate by a conversion factor from the following table:

Example 1:

Oxygen is flowing through the meter at a displayed rate of 30 sccm (air). The actual flow rate is:
30 ÷ 1.05 = 28.6 sccm

Example 2:

You require a helium flow rate of 40 sccm. In this case, multiply the required flow rate by the conversion factor: 40 × 0.37 = 14.8 sccm (air).

Adjust the gas flow until the gas flowmeter displays 14.8 sccm.

Flowmeter Conversion Factors
Gas Factor
Air 1.00
Argon 1.18
Butane 1.42
Carbon dioxide 1.23
Carbon monoxide 0.98
Cyclopropane 1.21
Ethane 1.02
Helium 0.37
Hydrogen 0.26
Isobutane 1.42
Methane (natural gas) 0.75
Neon 0.83
Nitrogen 0.98
Nitrous oxide 1.23
Oxygen 1.05
Propane 1.23
Sulfur hexafluoride 2.25
 
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