Yokogawa EJX930A - Manual (Page 14)

<2. About the EJX Multivariable Transmitter>
2-6
IM 01C25R01-01E
2.5.1 Configuration Procedure for Basic
Mode
Either a communicator or the mass flow
configuration software is required to carry out
configuration in basic mode.
Calculation of the basic mode parameters is
necessary to perform configuration. Following
shows the procedures for HART protocol type.
(1) Have ready a power supply, a personal
computer, a HART modem and the FSA120
EJX-MV Configuration DTM.
(2) Install the flow configuration software on the
personal computer.
This is not necessary if only the HART
communicator is used for configuration.
(3) Connect the EJX multivariable transmitter to the
power supply.
NOTE
Even when the RTD is not connected and alarm
number 03 is displayed on the indicator, setting
can be performed.
(4) Connect the HART communicator or the HART
modem to the transmitter.
(5) Perform flow configuration.
(6) Execute flow simulation with the HART HHT
or the FSA120 software in order to confirm the
configured flow parameters.
When the simulation is carried out, it is
necessary to connect the RTD or mock
resistance (about 100Ω) to the transmitter.
Input the differential pressure, static pressure,
and temperature values and then confirm that
the desired flow has been obtained.
(7) Remove the HART communicator or the HART
modem from the transmitter.
(8) Turn off the power supply.
NOTE
(1) Refer to the following instruction manuals for
more detailed explanation.
Setting with the HART HHT:
IM01C25R02-01E.
Setting with the Fieldbus configuration tool:
IM01C25R03-01E.
Setting with the FSA120: IM01C51R01-01E.
(2) For the flow configuration in the field after
installation, perform only steps 4 to 7.
2.5.2 Calculation of the Basic mode
parameters
There are two methods for the calculation of the
Basic mode parameters.
Method 1: Calculating the Kfactor by flow
parameters
Method 2: Calculating the Kfactor by means of the
flow condition
Method 1. Calculating the Kfactor by flow
parameters.
(1) Selection of the flow equation
Select the desired operational expression
according to the fluid type and the flow unit
category shown in Table 2.1.
(2) Confirming the unit
The unit to be used in this calculation is as
follows:
Differential pressure: Pa
Static Pressure: kPa abs
Temperature: K
The dimension of the pressure unit Pa are
M•L -1 •S -2
Where M: mass (Kg)
L: Length (m)
S: Time (second)
(3) Preparation of flow parameters for Kfactor
calculation
Each parameter must be expressed in the
following units.
d: m,
ρb and ρnorm: Kg/m 3
C, β, ε and K has no dimensions
(4) Calculation of the unit conversion coefficient Nc
The flow rate value does not change
automatically when a flow unit parameter is set
for the transmitter, and is always output as Kg/s
(mass flow). M 3 /s (volume flow), Nm 3 /s (Normal
volume flow.)
In order to obtain a value in your designated
unit, it is necessary to set Nc.
Nc is a conversion coefficient for the flow and
DP unit that is designated to be used.
(5) Selection of the Kfactor equation and calculation
Select the Kfactor expression according to the
fluid type and the unit category shown in Table
2.1.
Calculate the Kfactor using the parameters and
the expression.