Yokogawa 415 Steam and Gas - Manual (Page 29)

Energy Flow
......(13) SI Units : Q
E(SI)
=
Q
M(SI)
x h
1000
......(14) US Units : Q
E(US)
= 0.42992
Q
M(US)
x h
1000
B. Volumetric Flowmeters With 4-20mA Output.
eg. Vortex or Steam turbines with frequency to current convertors.
Mass Flow
......(15) SI Units : Q
M(SI)
= 1000 x
S
V
ν
F
x A
......(16)
Energy Flow
Equations 13 & 14 are used.
C. Differential Pressure Flowmeters With 4-20mA Output And A Square
Law Relationship.
eg. Orifice Plates, Averaging Pitot tubes, target flowmeters, etc.
Mass Flow
......(17) Q
M
= S
M
.
ν
B
ν
F
. A
Energy Flow
Equations 13 & 14 are used.
Operation 27
US Units : Q
M(US)
= 62.447 x
S
V
ν
F
x A