YOKOGAWA vigilantplant EJXMVTool FSA120, User Manual, Page: 86 / 98

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<Toc> <Ind> <6. Display Specification >
All Rights Reserved Copyright © 2006, Yokogawa Electric Corporation
IM 01C25R51-01E
The procedure for setting the BASIC Mode is as follows. For details on how to calculate the
Kfactor, refer to the EJX910 Multivariable Transmitters User’s Manual (IM 01C25R01-01E).
Table 6.11 Flow Operational Expression
T0613E.EPS
Mass Flow
Normal·Standard
Volume Flow
Volume Flow
Mass Flow
Normal·Standard
Volume Flow
Volume Flow
Kfactor *2 Flow Equation
Qm or Qv or Qv_norm
*1
= Kfactor
Fluid
type
Liquid
Gas
Qv= Kfactor *1
Kfactor =
π
/4 Nc C/ 1–
β
^4
ε
d^2
Kfactor =
π
/4 Nc C/ 1–
β
^4
ε
d^2
Kfactor =
π
/4 Nc C/ 1–
β
^4
ε
d^2
Kfactor =
π
/4 Nc C/ 1–
β
^4
ε
d^2
Kfactor =
π
/4 Nc C/ 1–
β
^4
ε
d^2
Kfactor =
π
/4 Nc C/ 1–
β
^4
ε
d^2
*1 mark indicate User Input
*2 Kfactor must be calculated according to the Flow unit category
*3 Reter to table 6.5, 6.6, 6.7
Qm or Qv_norm
*1
= Kfactor
Flow unit Category
*3
P T/Tb SPb/SP
P (1+Temp K1 (T–Tb))
P Tb/T SP/SPb
2
ρ
b
2
ρ
b /
ρ
norm
2 /
ρ
b
2
ρ
b 1/K
2
ρ
b 1/K /
ρ
norm
2/(
ρ
b 1/K)
Table 6.12 Symbol
T0614E.EPS
#
Nc
Qm
Qv
Qv_norm
1
Symbol
2
6
8
7
5
3
4
SPb
T
Tb
SP
norm
Temp K1
b
ε
Kfactor
C
9 d
∆
p
Reference temperature unit: K
Diameter of orifice
Diameter Ratio
Expansion Factor
Base Density on Tb, SPb Condition
Density on Normal, Standard condition
Differential Pressure
(Transmitter Setting unit)
10
Basic flow Calculation factor
Volume Flow
Mass Flow
Description
Normal·Standard Volume Flow
Temperature unit: K
Unit convert factor
Discharge Coefficient
13
14
16
15
12
11
K Compressibility factor
The density rate of change per temperature
1degC of a density base value (value which
set 100% to 1)
For volume flow: set 0.
Static Pressure unit: kPa abs
17
18
Reference static pressure unit: kPa abs