Atmospheric Conditions - Millipore M Air T Manual Del Usuario

M Air T Calibration Kit User Guide

Atmospheric Conditions

The standard Millipore atmospheric conditions for this unit are:
■ Atmospheric pressure: 1000 mbars
■ Temperature: 20°C
If your environmental conditions (atmospheric pressure and tempera-
ture) are different, use the following equation to obtain the flow rate
corresponding to your conditions:
Where:
Q : Volumetric flow rate under your measurement conditions
0
Q : Volumetric flow rate at the standard pressure and temperature
Ref
(1000 mbars , 20°C)
D : 1.18883 kg/m
Ref
temperature (1000 mbars, 20°C)
D : Air density under your measurement conditions
0
The air density is calculated either from the tables supplied with the
calibration certificate (see the "Calculation Using the Calibration Certifi-
cate" section), or by applying the approximated equation below:
Density of dry air =
The pressure and temperature in this equation are those measured
under your environmental conditions.
3
= Air density at the standard pressure and
Pressure (mbars)
1013.25
(applied)
×
1 + (0.00367 × Temperature (°C)
1.293
5