Yokogawa 415 Steam and Gas - Manual (Page 19)

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