Alpha Moisture Systems SADPmini2 User Manual page 21

SADPmini2 User Manual
ppm(V)
Moisture concentration expressed as parts per million by volume.
ppm(W)
Moisture concentration expressed as parts per million by
weight when referencing the gas in which the moisture is
being measured. The SADPmini2 default setting is for air
(molecular weight 28.99) however, this function allows the
molecular weight to be set appropriately for other gases.
There are other pre-sets available for Carbon Dioxide,
Ethylene, Hydrogen, Methane, Nitrogen, Oxygen and
Sulphur Hexafluoride.
The choice of gas applies to moisture concentrations
indicated in both Main and Secondary display.
3
mg/m
Moisture concentration expressed as milligrams per cubic metre.
3
Often referred to absolute humidity when expressed as SI units kg/m
lb/MMscf
Moisture concentration expressed as pounds per million standard cubic feet.
3
Often referred to absolute humidity when sometimes expressed as lb/ft
Within this unit choice option there exists an option to further refine the indicated
reading calculation by selecting either Ideal gas behaviour (Magnus) or Natural Gas
(Bukacek correlation). The choice of calculation method applies to moisture
concentrations indicated in both Main and Secondary display.
19