Yokogawa 415 Steam and Gas User Manual

Page 29

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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

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