Yokogawa EJX930A - Manual (Page 112)

<7. Operation of EJXMVTool> 7-19
IM 01C25R51-01E
7.2.2 Basic Mode Setup
Select a Fluid Type from “Gas” or “Liquid”.
(1) Gas (Default)
Figure 7.19 Basic Mode Setup Screen
• Input Reference Temperature (Tb), Reference Static Pressure (SPb), and Kfactor.
NOTE
The static pressure value is according to the transmitter’s abs and gauge selection (A/G select).
But same unit character is used for both absolute and gauge.
The procedure for setting the BASIC Mode is as follows. For details on how to calculate the
Kfactor, refer to the EJX910A and EJX930A Multivariable Transmitters User’s Manual (IM
01C25R01-01E).
Table 7.11 Flow Operational Expression
T0701E.ai *1: mark indicate User Input
*2: Kfactor must be calculated according to the Flow unit category
*3: Reter to table 7.5, 7.6, 7.7
× ∆P × T/Tb × SPb/SP
Fluid
type
Flow unit
Category *3
Kfactor *2 Flow Equation
Mass Flow
Mass Flow
Volume Flow
Volume Flow
Gas
Liquid Normal·Standard
Volume Flow
Normal·Standard
Volume Flow
Kfactor = /4 × Nc × C/ 1−β 4 × ε × d 2
Ч 2 Ч ρb
Ч 2 Ч ρb / ρ norm
× 2 / ρb
Ч 2 Ч ρb × 1/K
Ч 2 Ч ρb × 1/K / ρ norm
× 2/(ρb × 1/K)
Qm or Qv or Qv_norm
= Kfactor
Qm or Qv_norm
= Kfactor
× ∆P × Tb/T × SP/SPb
Qv= Kfactor
Kfactor = /4 × Nc × C/ 1−β 4 × ε × d 2
Kfactor = /4 × Nc × C/ 1−β 4 × ε × d 2
Kfactor = /4 × Nc × C/ 1−β 4 × ε × d 2
Kfactor = /4 × Nc × C/ 1−β 4 × ε × d 2
Kfactor = /4 × Nc × C/ 1−β 4 × ε × d 2
× ∆P × (1+Temp K1 × (T–Tb))
*1
*1
*1
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√