Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
Measuring the Oxygen Saturation
When the pressure at the water/air exchange surface is unequal to 1013 mbars,
pressure correction is required for correct measurement of the oxygen saturation.
This pressure correction cannot be directly made using MemoRail. It must be inte-
grated in the connected peripherals (PLC, PCS, etc.) using a calculation formula.
The saturation value supplied by MemoRail must be multiplied with a factor
which is calculated using the following formula:
(1013-Pw(t))/P-Pw(t))
P
Pressure at exchange surface [mbar] (absolute barometric pressure,
pressure in gas-filled space of closed tank, etc.)
Pw(t)
Water-vapor partial pressure [mbar] at temperature t
t
Temperature of medium [°C]
Calculating Pw(t):
Pw(t) = (23.373 + 1.4478 (t-20) + 3.9262 10 -2 (t-20) 2 + 5.9652 10 -4 (t-20) 3 + 5.3782
10 -6 (t-20) 4 + 3.0420 10 -8 (t-20) 5 ) mbars
6
Publicité
Table des Matières
