Flow Rate Curve; Calculating The Flow Rate - Millipore M Air T Manual Del Usuario

6

Flow Rate Curve

The equation of the flow rate curve (in liters per minute) versus the
flowmeter flow height (in mm) established at standard Millipore
temperature and pressure is:
Q = Ah² + Bh + C
Ref
Where:
Q : Volumetric flow rate (in liters per minute) at the standard pressure
Ref
and temperature (1000 mbars, 20°C)
h: Flowmeter float height (in mm)
A, B and C: Constants specific to each calibration kit

Calculating the Flow Rate

Below is an example of a typical calculation:
Your measurement conditions:
■ Atmospheric pressure: 1030 mbars
■ Temperature: 15°C
Determine the air density ratio:
Where:
D : 1000
Ref
1013.25
D : Pressure (mbars) ×
0
1013.25
I.e. under your measurement conditions:
=
(at standard temperature and pressure)
(from the float height)
×
1+ (0.00367 × Temperature [°C] )
1.18883
1 0 3 0
×
1013.25
1.293
1+ (0.00367 × 20 [°C] )
1.293
1.293
1+ (0.00367 × 15)
http://www.millipore.com
= 1.18883
= 0.9769