Yokogawa EJX930A - Manual (Page 9)

<2. About the EJX Multivariable Transmitter>
2-1
IM 01C25R01-01E
2. About the EJX Multivariable
Transmitter
This chapter gives an overview of the functions and
the installation of the EJX Multivariable transmitter.
For details on specific procedures, refer to the
corresponding chapter.
2.1 Features
• Multi Sensing Function
The EJX multivariable transmitter has a Multi
Sensing function that enables a single transmitter
to measure differential pressure, static pressure,
and external temperature. Mass flow measurement
instruments can calculate and output the flow
value using these three measured variables except
Modbus Communication Type. The FSA120 flow
configuration software (FlowNavigator) is used to
configure mass flow calculation.
• Simultaneous Analog Output and Pulse
Output (HART protocol type)
The EJX multivariable transmitter has one analog
output for the output of single measured variables.
With digital communications, all of these variables
can be output simultaneously.
In addition to analog output, pulse output is
provided as a standard function of the EJX
multivariable transmitter. It can perform both types
of output simultaneously. Pulse output is used for
total flow, flow rate, and alarm status.
DP sensor
SP sensor
Sensor Capsule
A/D
ROM
PC: Flow configuration
Electronics module
RTD Temperature Input Pressure Input
4 to 20 mA output
for selected PV.
RAM
Differential Pressure
/Static Pressure
/Process Temperature
/Calculated Mass Flow
ROM
MPU
/Calculate Mass Flow
/System control
D/A
Digital I/O
Pulse
output
Pulse output
or Status output.
Silicon Resonant
sensor
F0201.ai
Figure 2.1 Block Diagram of EJX Multivariable Transmitter System (HART protocol type)
2.2 Initial Check and Installation
Procedure
Figure 2.2 is a flowchart showing the basic
sequence for installing and wiring an EJX
Multivariable Transmitter.
Refer to the specified chapter for the details of each
procedure.
Flow configuration can be performed at the
following stages:
(1) On the bench, before installation.
(2) In the field, after installation.
IMPORTANT
Before performing flow configuration in the field,
make sure the installation location meets all
safety requirements.