Address: No. 91-93, Lane 5, An Phu Ward, District 2, HCM City
Telephone: (+84) 24 6663 2426
Hotline: (+84) 961 739 336
Operation Time: all weekdays (except Sunday and National Holidays)

Yokogawa EJX910A Multivariable Transmitter

Vendor: Yokogawa

The EJX-A series is Yokogawa's premium performance line of DPharp transmitters.

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Released in 2004, it offers the performance and stability needed in demanding applications. The EJX-A series performance makes it the thoroughbred of the DPharp family of pressure transmitters.

The EJX910A multivariable transmitter is a remarkable innovation in multi-sensing technology. It makes optimal use of the unique characteristics of the DPharp sensor to give you greater insight into your process.

EJX910A features include:

Mass Flow Version:

  • Orifice, Nozzle and Venturi primary devices are supported
  • For HART7 protocol, Multiport Averaging Pitot and Cone meters are supported additionally
  • ±1.0% mass flow rate accuracy
    (In case of uncalibrated differential producer (Orifice))
  • Fully compensated mass flow
  • Mass Flow Totalizer with ±1.0% accuracy
  • Pulse / Contact output
  • TUV SIL 2/3 Certification

Multi-Sensing Version:

  • ±0.04% Differential Pressure Accuracy
  • ±0.1% Static Pressure Accuracy
  • ±0.9°F External Temerature Accuracy
  • TUV SIL 2/3 Certification


Digital Performance

Digital Performance

Yokogawa's DPharp digital sensor offers twice the performance and stability of the competitor's analog sensors. The DPharp uses the latest in IC Chip-style design and manufacturing technology. Analog sensors are based on older design technology. Although analog sensors are good, the modern DPharp sensor out performs them. A Yokogawa transmitter with DPharp digital sensor will give you the consistent, reliable, accurate measurement you need.

Poor Performance = Lost Money 

Accuracy Under All Operating Conditions

Accuracy Under All Operating Conditions

Yokogawa's DPharp sensor has the ability to measure the differential pressure (DP), static pressure (SP), and sensor temperature from a single sensor. Giving these three pieces of process data, Yokogawa's transmitter can compensate the DP measurement for Temperature Effect and Static Pressure Effect in real time. This is referred to as Dynamic Compensation and improves the DP measurement accuracy.

Competitor's analog sensors can only measure DP and Sensor temperature. So, theirs can compensate for temperature Effect; but, since the SP measurement is missing, it cannot compensate for Static Pressure Effects.

Poor Performance = Lost Money 

Stability Under All Operating Conditions

Stability Under All Operating Conditions

Digital DPharp sensor provides stable measurement in all operation conditions.
To some degree, all pressure sensors on the market provide stable measurement with variations in temperature and static pressure. But what happens when the sensor is over-pressured (pressure > sensor Upper Range Limit (URL)) - like occurs when a manifold is incorrectly sequenced during start-up or shutdown? Or a process upset? Analog sensors are actually damaged during these events requiring the transmitter to be recalibrated to return to accurate operation or even replaced. Yokogawa's transmitters can withstand large overpressure events. (*See the table below.) Once it returns to normal operating pressure (pressure < URL of the sensor), the transmitter will return to operation within the defined accuracy and stability specifications - no need to recalibrate. Basically, the Yokogawa DPharp sensor has a larger operational envelope compared to an analog sensor.

Poor Performance = Lost Money

*Maximum overpressure stability.
MWP3,600 psi4,500 psi

More Information

More Information

Save up to 20% on CAPEX spending using our transmitter’s multi-sensing capability.

Using digital communication, one Multivariable transmitter can supply your control system with Level (Primary variable), Blanket Pressure (Secondary variable), and Sensor Temperature (Third variable)—eliminating the need for multiple transmitters.

More Information = Found Money 

Signal Characterization

Signal Characterization

Signal characterization is a versatile function available on all Yokogawa pressure transmitters. The function is used to compensate the analog 4 to 20 mA output signal for non-linear applications. Such applications include tank strapping or flow measurements; but, it can be used in any application where the relationship between the pressure input and the desired output signal are known. This feature can use up to 10-points.

Greater Flexibility = Found Money 

Local Indicator

Local Indicator

All of the process variable's measured by Yokogawa's transmitter can be displayed on the easy to read local indicator. The indicator can display any of the variables measured (DP, SP, Capsule temperature); alarm codes with short text; and a sweeping bar graph to give a graphical representation of the process. Fully programmable, the indicator is customizable for your needs. Unlike competitor's transmitters, the indicator is not driven off the 4 to 20 mA analog signal, but, exist on a separate circuit. This allow the display to operate independently from the output signal, so it can indicate information that maybe more useful at the transmitter location.

More information = Found Money 

Standard Diagnostics

Yokogawa's transmitter has 40 self-diagnostic checks to ensure that everything is running smoothly within the transmitter. But, all transmitters on the market have a level self-diagnostic checks. However, Yokogawa has two that are not offered by competitors. First, the transmitter features a patented Back-check Technology that reverse checks all calculations in real-time. Second, the DPharp sensor is an active sensor. This means that the sensor is constantly supplying a signal even when the process has not changed. If the signal is lost from the sensor, the transmitter knows there is an issue. Competitor's analog sensors are passive. They do not supply a continual signal, so, is the sensor still working when there is no signal?

Good Diagnostics = Less Surprises 

Advanced Diagnostics

Advanced Diagnostics

Reduce unscheduled maintenance by 60%.
Predictive impulse line blocking and stream tracing diagnostics lets you see problems before they happen.


Measurement Types
VariableMass Flow
Differential Pressure (DP)
Static Pressure (SP)
External Temperature (from RTD)
Reference Accuracy
Mass Flow±1.0% of Range
(In case of uncalibrated differential producer (Orifice))
DP±0.04% of Span
SP (Absolute)±0.1% of Span
External Temperature±0.9°F
Long Term Stability (All Normal Operating Conditions)
DP±0.1% of URL per 10 years
Response Time
DPL-Capsule: 230 ms
M and H capsule: 200 ms
SPAll Capsules: 200 ms
Maximum Pressure Limit (MWP)
L-Capsule2,300 psi
M and H Capsule3,600 psi
Over-pressure Effect
DP±0.03% of URL
Specification Conformance
EJX-A Series±3σ
Burst Pressure (Absolute)
All Capsules10,000 psi


EJX910A Communication Protocols

HART Protocol

  • 1.0% mass flow rate accuracy over 1:10 flow range
  • Orifice, Nozzle and Venturi primary devices are supported
  • For HART7 protocol, Multiport Averaging Pitot and Cone meters are supported additionally
  • Simultaneous dual output of 4 to 20mA and pulse signals
  • HART protocol revision selectable from HART 5 or HART 7
  • SIL 2 certified standard

FOUNDATION Fieldbus Protocol

  • 1.0% mass flow rate accuracy over 1:10 flow range
  • Orifice, Nozzle and Venturi primary devices are supported
  • Various function blocks available: 5 AIs, AR, IT, SC, and IS standard
  • PID is an optional feature
  • Cyclically displays up to 10 values

Modbus Protocol

  • RS485 Modbus protocol provides easy multi-sensing data transmission to flow computers
  • The process data status is provided for each measured variable: Differential Pressure, Static Pressure, and Process Temperature - making it easy to implement process data diagnosis
  • Cyclically display up to 16 variables including RTU management data
  • Up to 32 transmitters can be connected by multi-drop communication
  • 32 character tag and squawk are supported for easy identification of transmitters