Bronkhorst Mass Flow - Manual (Page 14)

BRONKHORST HIGH-TECH B.V.
1.8.2 Liquid conversion factors
The general formula for determining the relationship between signal and mass flow reads:
V k c
signal p m
= ⋅ ⋅ Φ
in which: V
signal
= output signal
k = calibration constant
c
p
= heat capacity at constant pressure of the fluid
Φ
m
= mass flow
A conversion factor must be used if the liquid flow meter is not used on the calibrated liquid.
This conversion factor reads:
1 2
m m
Cf Φ ⋅ = Φ Cf c
c
p1
p2
=
in which: c
p1
= heat capacity of the calibration liquid
c
p2
= heat capacity of the new liquid
For application of this formula consult Bronkhorst High-Tech B.V.
1.8.3 Software for conversion factor calculation
Bronkhorst High-Tech B.V. gathered the physical properties of over 600 fluids in a database called
FLUIDAT.
Application software, such as FLUIDAT on the Net (FOTN), enable the user to calculate accurate
conversion factors, not only at 20°C/1 atm (as shown in the conversion table, App.1) but at any
temperature/pressure combination.
Apply to your distributor for more details of this software.
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