The main endpoint criterion used in
the software is a user-specified Standard Deviation (StDev) over a user-specified
number of the most recent flux density readings. This is indicated in
the screenshots above by the cyan-coloured average bars, where the vertical
length is ±1 StDev and the horizontal length indicates the data
included in the average. The default settings for the AquaFlux are:-
StDev = 0.075 g/(sq.m h) over the 10 most recent flux
How this looks in practice is indicated in the uppermost screenshot.
These settings were used for determining the measurement
times in the table above.
If you want quicker measurements, then you can use a larger StDev setting.
This is illustrated in the two lower screenshots with StDev settings of
0.3 and 0.5 g/(sq.m h). Clearly, the flux readings have not settled,
but if you use the same settings throughout a study, then the relative
TEWL values will be meaningful. These StDev values are typical for open-chamber
instruments. The higher sensitivity of the AquaFlux makes them look inappropriate.