Yokogawa 415 Steam and Gas User Manual
Page 19
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Normalised Conditions (SI Units only)
Normalised conditions are defined as:
0°C (273.15°K) and 101.325 kPa.
A.
Volumetric Flowmeters With Frequency Output.
eg. Vortex, turbine or positive displacement flowmeters.
......(4)
Q
VB
=
N. frequency(Hz)
K
F
.
P
F
P
B
.
T
B
T
F
.
Z
B
Z
F
......(5)
Q
M
=
ρ
B
. Q
VB
B.
Volumetric Flowmeters With 4-20mA Output.
eg. Vortex, turbine or positive displacement flowmeters with frequency to
current convertors.
......(6)
Q
VB
= S
V
.
P
F
P
B
.
T
B
T
F
.
Z
B
Z
F
. A
Q
M
=
ρ
B
. Q
VB
C.
Differential Pressure Flowmeters With 4-20mA Output And A Square
Law Relationship.
eg. Orifice Plates, Averaging Pitot Tubes, Target Flowmeters, etc.
......(7)
Q
VB
= S
VB
.
P
F
P
B
.
T
B
T
F
.
Z
B
Z
F
.
A
Q
M
=
ρ
B
. Q
VB
Operation 17
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