Owner's manual

<3. Parameter Setting>
3-30
IM 01C25R02-01E
Table 3.2 Basic Flow Calc Set-up Steps
Step Parameter Contents Remarks
1 Flow Calc Mode Select Basic Mode
2 Fluid Type Select liquid or gas
3 Flow Calc Fixed Input Kfactor Kfactor calculated by Table 3.3 Flow Equation and Kfactor
Calculation
4 Ref SP Input reference static
pressure
This factor is used for gas.
When uid type is liquid, set 0 to Ref SP(Spb).
5 Ref Temp Input reference temperature
6 Temp K1 Input the density rate of
change per temperature
1degC.
This factor is used for mass ow and normal standard volume ow
of liquid. When uid type is gas or volume ow of liquid, set 0 to
TempK1. Refer to Table 3.4 Symbol
Equation for Basic ow calculation
The ow equation shown in Table 3.3 is applied to the transmitter by combination of uid type and ow unit
category.
Table 3.3 Flow Equation and Kfactor Calculation
T0310.ai
Mass Flow
Normal-Standard
Volume Flow
Volume Flow
Mass Flow
Normal-Standard
Volume Flow
Volume Flow
Kfactor = /4 × Nc × C / 1- β
4
× ε × d
2
× 2 × ρb
Qm, Qv or Qv_norm
= Kfactor × ∆ρ × (1+ Temp K1 × (T-Tb))
Fluid Type
Flow unit category Kfactor
*2
Flow Equation
liquid
Gas
Kfactor = /4 × Nc × C / 1- β
4
× ε × d
2
× 2 × ρb / ρ norm
Kfactor = /4 × Nc × C / 1- β
4
× ε × d
2
× 2 / ρb
Kfactor = /4 × Nc × C / 1- β
4
× ε × d
2
× 2 × ρb × 1/K
Kfactor = /4 × Nc × C / 1- β
4
× ε × d
2
× 2 × ρb × 1/K / ρ norm
Kfactor = /4 × Nc × C / 1- β
4
× ε × d
2
× 2 / (ρb × 1/K)
*1
Qm or Qv_norm
= Kfactor × ∆ρ × Tb/T × SP/SPb
Qv = Kfactor × ∆ρ × T/Tb × SPb/SP
*1
*1
*1 mark indicate user input.
*2 Kfactor must be calculated according to the specified flow unit.
Table 3.4 Symbol
No Symbol Description
1 Qm Mass Flow
2 Qv Volume Flow
3 Qv_norm Normal-Standard Volume Flow
4 Nc Unit convert factor
5 Kfactor Basic ow Calcuration factor
6 C Discharge Coefcient
7 ε Expansion Factor
8 β Diameter Ratio
9 d Diameter of orice
10 ∆p Differential Pressure (Transmitter setting unit)
11 ρb Base Density on Tb, SPb condition
12 ρ norm Density on Normal, Standard condition
13 Tb Reference temperature (unit: K)
14 T Temperature (unit: K)
15 SPb Reference static pressure (unit: kPa abs)
16 SP Static Pressure (unit: kPa abs)
17 Temp K1 The density rate of change per temperature 1degC of a density base value (value which set 100%
to 1). For volume ow: set 0.
18 K Compressibility factor
Note 1. The ow unit is not automatically converted. Refer to IM 01C25R01-01E for Nc calculation.
Note 2. Kfactor, SPb, and Tb are calculated using the equipment setting unit (differential pressure, static pressure, and temperature).
Note 3. Total ow is calculated using the transmitter setting unit.