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Gas- and Steam Flowcomputer
DigiFlow 515
Operating Manual
10
6 Application
6.1 The DigiFlow 515 as gas compensation calculator.
Flow equations for gases
This chapter is only of meaning for flow measurings at gases. If the flow medium is steam, you can change
for chapter 5.2 on page 16 at once.
The flow calculator
DigiFlow 515
process the input signals of a wide range of flowmeters by the equations
defined below.
Mass flow and corrected volume are shown and processed in SI units. For explanation about the following
abbreviations see listing at the beginning of the operating instruction.
2 formulas form the basis for all other equations:
!
Specific
Gravity
d
=
Molecular Weight of Gas
Molecular Weight of Air
d
=
Molecular Weight of Gas
28.9625
[
1
]
"
Density of a gas
ρ
0
, at Reference Conditions:
in SI-Units:
ρ
0
3
3 4834
=
⋅ ⋅
⋅
.
d p
z
T
kg
m
b
b
b
[
2
]
The conditions all calculations are being based (‘NORM“-conditions), will be entered by the user. Most times
these will be set to:
•
Temperature 0 °C (273.15 K) and Pressure 101.325 kPa
abs
A:
Volumetric Flowmeters With Frequency Output.
(e.g. VORTEX, turbine or PDF with Pulse Output).
Q
N
f
k
p
p
T
T
z
z
Vb
F
b
b
b
f
=
⋅
⋅
⋅
⋅
0
[
4
]
Q
Q
M
Vb
= ⋅
ρ
[
5
]
Summary of Contents for digiflow 515
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