character string describing the gas species. Options are available from molvol. Default is "O2".
temp
temperature (<U+00B0>C). Default is 25 <U+00B0>C.
reg_pres
gauge pressure from the gas regulator into the peristaltic pump.
reg_unit
unit used in reg_pres. Default is "psi".
atm_pres
atmospheric pressure (mbar). Default is 1013.25 mbar.
Details
Most mass flow controllers are programmed with a "standard condition" something like 0 *C and 1013 mbar for which they account for the pressure and temperature of an incoming gas source. For setups without expensive mass flow controllers, a more affordable alternative is to use a peristaltic pump. These do not account for variations in incoming gas pressure and temperature and thus, it must be calculated to set the peristaltic pump to the correct RPM.