Yokogawa EJX930A - Manual (Page 78)

<6. Operation of FlowNavigator Program> 6-5
IM 01C25R51-01E
6.1.3 Flow Calculation of Device and FlowNavigator
(1) EJX Multivariable Transmitter
Refer to the instruction manual “EJX910A and EJX930A Multivariable Transmitters” (IM
01C25R01-01E)
(2) digitalYEWFLO Vortex Flowmeter
Followings give an overview of the calculation modes.
• Detail (Gas / Liquid) Compensation Mode
- Gas temperature pressure compensation (Detail)
The mass flow rate of the gas is calculated based on the process temperature and pressure
by referring to the physical property database of FlowNavigator Resource.
The temperature value is the output of digitalYEWFLO Built-in Temperature Sensor
(Optional Code /MV) or Temperature Transmitter. The pressure value is the output of
Pressure Transmitter.
- Liquid temperature compensation (Detail)
The mass flow rate of the liquid is calculated based on the process temperature by referring
to the physical property database of FlowNavigator Resource. The temperature value is the
output of digitalYEWFLO Built-in Temperature Sensor (Optional
Code: /MV) or Temperature Transmitter.
• Steam Compensation Mode
- Saturated steam (Temperature)
The mass flow rate of the saturated steam is calculated based on the process temperature
by referring to the saturated steam table (a process temperature) in the device. The process
temperature value is the output of digitalYEWFLO Built-in Temperature Sensor (Optional
Code: /MV) or Temperature Transmitter.
- Saturated steam (Pressure)
The mass flow rate of the saturated steam is calculated based on the process pressure
by referring to the saturated steam table (a process pressure) in the device. The process
pressure value is the output of Pressure Transmitter.
- Superheated steam
The mass flow rate of the superheated steam calculated based on the process temperature
and pressure by referring to the superheated steam table in the device. The process
temperature value is the output of digitalYEWFLO Built-in Temperature Sensor (Optional
Code: /MV) or Temperature Transmitter, and the process pressure value is the output of
Pressure Transmitter.
• Simple (Gas / Liquid) Compensation Mode
- Gas temperature pressure compensation
The mass flow rate of the gas is calculated based on the process temperature and pressure
by using the density correction value input by users in FlowNavigator. The temperature
value is the output of digitalYEWFLO Built-in Temperature Sensor (Optional Code: /MV) or
Temperature Transmitter. The pressure value is the output of Pressure Transmitter.
- Liquid temperature compensation
The mass flow rate of the liquid is calculated based on the process temperature by using
the density correction value input by users in FlowNavigator. The temperature value is the
output of digitalYEWFLO Built-in Temperature Sensor (Optional Code: / MV) or Temperature
Transmitter.