IM 01C25R01-01E
2-6
2. About Multivariable Transmitter
(3) Connect the EJX910A 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 EJX910.
(5) Perform flow configuration.
(6) Execute flow simulation with the HART HHT or
the FSA210 software to confirm the configured
flow parameters.
When executing the simulation, it is necessary to
connect the RTD or mock resistance (about 100
)
to the transmitter.
Input the differential pressure, static pressure, and
temperature values and confirm that the desired
flow has been obtained.
(7) Remove the HART communicator or the HART
modem from the EJX910A.
(8) Turn off the power supply.
NOTE
(1) Refer to the following instruction manuals for
a more detailed explanation:
When setting by HART HHT: IM01C25R02-01E.
When setting by FSA210: IM01C50R01-01E.
(2) When doing flow configuration in the field,
after installation, perform only steps 4 - 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,
b and
norm :Kg/m
3
C,
,
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 transmit-
ter, 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.
(6) Downloading flow parameter to a transmitter
Input Kfactor, Tb, SPb and TempK 1 to the
transmitter using either a Communication tool or
EJXMVTool.
Use the unit of "Kg/m
3
/degC" for TempK1
IMPORTANT
If either the setting of flow unit or differential
pressure unit is changed, Kfactor and Nc must
be recalculated.
