Wednesday 19 December, 2018
Home FAQ What do ln/min, ls/min, slm and sccm stand for?

SCCM, ln/min or other Mass Flow units, where do they stand for?

Mass flow should actually be expressed in units of weight such as g/h, mg/s, etc. Most users, however, think and work in units of volume. No problem, provided conditions are agreed upon, under which the mass is converted to volume.

Our STP or standard temperature and pressure conditions used are stated here:

Normal conditions (ln/min): a temperature of 0 °C (or 32°F) and a pressure of 1.013 bar (or 14.69 psi) are selected, and these reference conditions are indicated by the underlying letter “n” in the unit of volume used. The direct thermal mass flow measurement method is always based on these reference conditions unless otherwise requested.

Standard conditions (ls/min): here the reference conditions are based on 20 °C (68°F) instead of 0 °C (32°F). Please be aware of this difference, because mixing up these reference conditions causes an error of 7%!

Typical flow unit

Reference conditions for gas temperature

Reference conditions for gas pressure

 mln/min (milliliter normal per minute)

 0 °C / 32 °F

1.013 bar / 1 atm / 14.69 psi

  ln/min (liter normal per minute)

 0 °C / 32 °F

1.013 bar / 1 atm / 14.69 psi

sccm (standard cubic centimeter per minute)

 0 °C / 32 °F

1.013 bar / 1 atm / 14.69 psi

slm (standard liter per minute)

 0 °C / 32 °F

1.013 bar / 1 atm / 14.69 psi

mls/min (milliliter standard per minute)

20 °C / 68 °F

1.013 bar / 1 atm / 14.69 psi

ls/min (liter standard per minute)

 20 °C / 68 °F

1.013 bar / 1 atm / 14.69 psi

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