The EJX110A is a high-performance differential pressure transmitter used to measure liquid, gas, or steam pressure. Featuring Yokogawa DPharp sensor technology, the EJX110A delivers measurements accurately, quickly, and reliably.

EJX-A series models in their standard configuration, with the exception of the Fieldbus and PROFIBUS types, are certified as complying with SIL 2 safety requirements.




What Are the Benefits of Differential Pressure Transmitters?


The EJX110A with DPharp digital sensor offers the performance needed to run your operations at peak performance. This ensures on-spec product, reduced waste, and improved yield, helping you increase profitability.


Digital Performance

Poor Performance = Lost Money

Other pressure sensor technologies require an analog to digital conversion before the signal can be processed, introducing additional errors. In Yokogawa’s pressure transmitters, the DPharp sensor directly outputs a digital signal, eliminating the need for analog to digital conversion and improving performance.



Accuracy Under All Operating Conditions

Poor Performance = Lost Money

Fluctuations in static pressure and temperature cause errors in differential pressure measurement. Analog sensors can only measure DP and sensor temperature and therefore can only compensate for temperature effect.

Yokogawa’s DPharp digital sensor measures the differential pressure (DP), static pressure (SP), and sensor temperature from a single sensor. Given these three pieces of process data, our differential pressure transmitters compensate the DP measurement for temperature effect and static pressure effect in real time. This compensation is referred to as Dynamic Compensation and improves DP measurement accuracy.

Learn more about Dynamic Compensation.


Stability under all operating conditions

Poor Performance = Lost Money

What happens when a transmitter sensor is exposed to overpressure?

Overpressure events such as incorrect sequencing of a manifold during start-up or shutdown and process upsets can damage analog sensors, requiring the transmitter to be recalibrated - or even replaced - in order to return it to normal operations.

The simple, robust design of Yokogawa's DPharp pressure sensor makes it less susceptible to overpressure events. A mechanical system within the transmitter provides additional overpressure protection by equalizing the excessive pressure before it reaches the sensor. Once it returns to normal operating pressure, the transmitter returns to operation within the defined accuracy and stability specifications with no need for recalibration. The Yokogawa DPharp sensor has a more significant operational envelope compared to an analog sensor, allowing you to run your control loop at your desired set-point regardless of process conditions.



How to Reduce Total Cost of Ownership?


The EJX110A reduces total cost of ownership by having safety as standard, extending calibration intervals, and giving users the option to measure both differential and static pressure with one transmitter.


Safety as Standard

Inherently Safe = Reliability

At Yokogawa, safety is never an option. All Yokogawa pressure transmitters are designed and certified to IEC61508:2010 Parts 1 through 7 and IEC61511:2004 Parts 1 through 3 by Exida® and TÜV Rheinland®.

As standard, all Yokogawa transmitters are certified for single transmitter use in SIL 2 safety applications and dual transmitter use in SIL 3 safety applications. The same transmitter can be used for both process control and safety applications. Managing two separate transmitter models is no longer necessary, reducing spares inventory and simplifying daily operations.


Extended Calibration Check Intervals

Quicker Maintenance = Less Downtime

When devices are initially installed, they operate at peak performance, but what happens after they are running under various process conditions and poorly managed or maintained? Changing operating conditions can cause transmitters to drift to the point where they are no longer able to make accurate measurements for the process loop they are installed in, resulting in poor quality or an impact to product yields. This requires a calibration check interval to ensure you’re operating within desired error limits.

Yokogawa EJX-A series pressure transmitters have the long-term stability of ±0.1% per 15 years under all operational conditions, reducing calibration frequencies. As you gain experience with these transmitters, the interval between calibration checks is extended. Long-term this can help reduce your maintenance cost by up to 34%. Spend your time where it is needed.


Multi-sensing in DP Applications

Other suppliers' transmitters use analog sensors, which require two separate transmitters for any application that needs both differential pressure (DP) and static pressure (SP) measurements.

Yokogawa's differential pressure transmitter features our multi-sensing DPharp sensor, which can measure both process variables (DP and SP) with a single transmitter, saving you the cost of a gauge pressure transmitter as well as the manifold, piping, wiring, I/O, construction and engineering man hours associated with it. With our DP transmitter, there are fewer devices to manage, maintain and calibrate, lowering overall lifecycle costs.


Standard Communication Protocol

Standard Communication ProtocolsNo Learning Curve = Smooth Change Over

Yokogawa transmitters support all industry standard field device communication protocols. Interoperability and interchangeability can be ensured. Use all the same tools and work procedures as before. Yokogawa transmitters are available with analog 4 to 20mA signal with either BRAIN® digital protocol or HART® digital protocol; Low Power analog 1 to 5 VDC with HART® digital protocol; or all digital FOUNDATION® Fieldbus or PROFIBUS® PA protocol.


International Certifications

Agency Approvals

With the rapid globalization of markets, numerous international standards and approvals are becoming necessary. Yokogawa pressure transmitters have acquired various international certifications including FM, CSA, ATEX, IECEx, INMETRO, KOSHA, EAC, and NEPSI.

Agency Approvals Marine Certificates Country Registration


ABS (American Bureau of Shipping)
Lloyd's Registry
Bureau Veritas
Det Norske Veritas
Nippon Kaiji Kyokai
Canadian CRN

Standard Industry Process Connections

No learning Curve = Smooth Change Over

Yokogawa transmitter uses the industry standard IEC61518 process connection dimensions. This ensures you will not need proprietary manifolds or accessories that limit your design choices. The IEC61518 standard gives you the peace of mind that if you ever want to make a change in transmitter manufacturer, you can. Some competitors have proprietary process connections that do nothing more than lock you into buying their product as replacements.


Universal Mounting

Pressure transmitters on the market have several different flange configurations depending on the medium being measured (gas or liquid). This requires plants that process both mediums to maintain a stock of both types of configurations. Yokogawa's pressure transmitters offer a universal mount that can be configured to handle either gas or liquid; reducing your inventory of replacement transmitters.


The proven DPharp technology of the EJX110A increases plant availability with its advanced diagnostics, overpressure protection, and quicker resolution of maintenance issues through multiple communication options. Verified by independent third parties around the world, our transmitter provides superior reliability and performance.


Proven Technology

Less Downtime = Making Product

Starting with a clean sheet of paper, Yokogawa developed in the early 1990s a completely new pressure sensing technology - the DPharp sensor. Yokogawa made a large commitment of resources and money in its development. That dedication paid off, and by late 2016, there are over 11 million installed Yokogawa transmitters and calibrators worldwide using this technology. The DPharp sensor is a proven technology.




Good Diagnostics = Fewer Surprises

Unlike traditional analog sensors, which are passive, the DPharp sensor is an active digital sensor. This means it is inherently safe and constantly supplying a signal even if there has been no change in process pressure. If the signal is lost, the transmitter’s self-diagnostics will alert you if there is an issue.

In addition, the transmitter features Back-check Technology (BCT) that reverse checks all calculations in real-time. These proven-over-time features improved reliability, resulting in fewer trips to the field and better process availability.


Rugged Construction

Harsh environments can reduce the life of your instrumentation, causing maintenance issues and plant downtime. Yokogawa’s ruggedly constructed pressure transmitters feature a four-bolt pressure retaining design, Teflon® coated 316L stainless steel flange gasket, and a dual seal certified to ANSI/ISA 12.27.01. These design features extend the life of your transmitter, increasing plant availability.


Overpressure Protection

Ruggedness = Reliability

During improper manifold sequencing, startup and shutdown conditions, or process upsets, overpressure can occur. The simple, robust design of Yokogawa's DPharp pressure sensor makes it less susceptible to overpressure events. A mechanical system within the transmitter provides additional overpressure protection by equalizing the excessive pressure before it reaches the sensor. Once stable process conditions return, these features enable the transmitter to return to normal operation within the published specifications.


Independent Third Party Verification

Less Downtime = Making Product

The Yokogawa EJX-A pressure transmitter series' performance and reliability have been verified by independent third parties from around the world. From Safety System SIL rating to general performance evaluations, the EJX-A series has met or surpassed every test that it has been given.


Multiple Communication Options

Quicker Maintenance = Less Downtime

Save Time, Save Money. Yokogawa offers the FieldMate / LPS platform to help you communicate and track your pressure transmitters. FieldMate is a Windows-based communication suite that is installed on a standard PC, laptop, or tablet computer. It can assist you in managing your entire instrument inventory. FieldMate HHC is a traditional hand-held communicator that allows you to communicate with transmitters in the field. If you forget your HHC, the Local Parameter Setting (LPS) feature of your Yokogawa transmitter allows you to update nine parameters without the HHC.


Local Indicator

More Information = Found Money

Easy to read indicator provides all the information you need. 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 other suppliers' transmitters, the indicator is not driven off the 4 to 20mA analog signal, but, exist as a separate circuit allowing the display to operate independently from the output signal.


EJX110A Specification Overview

Measurement Types
Primary Variable Differential Pressure
Secondary Variable Static Pressure
Reference Accuracy
Primary Variable ±0.04% of Span
±0.025% of Span available
Secondary Variable ±0.2% of Span
Response Time
Primary Variable 90 msec
Secondary Variable 360 msec
Long Term Stability
Primary Variable ±0.1% of URL per 15 years
Over-pressure effect
Primary Variable ±0.03% of URL
Primary Variable 200:1


EJX110A Capsules





Graphics not to scale.

EJX110A Pictures


For Differential pressure transmitters, Yokogawa offers a complete line of IEC 61518 compliant 3-valve and 5-valve manifolds. Available in T-Style, H-Style, Wafer-Style, and Bottom Process Connection Style, they can be ASME B31.1 (Power) Compliant, ISA 15848 Compliant, or TA-Luft Compliant.

Learn More

Diaphragm Seal System (DFS)

Expand the operating envelope of your transmitter with the addition of a Diaphragm Seal System (DFS). This system can isolate your transmitter from process temperatures beyond the limits of the transmitter or can isolate it from viscous/corrosive fluids.

Learn More



Yokogawa manufactures a communicator for your needs. Yokogawa communicators are available for BRAIN Protocol, HART Protocol, FOUNDATION Fieldbus, PROFIBUS PA, ISA100, or MODBUS. All our communicators are compatible with Yokogawa products as well as other products on the market.

Learn More


Yokogawa offers a range of loop powered and FOUNDATION Fieldbus remote indicators that can be used to locally monitor data from field instruments installed in difficult to access locations.

Learn More

Pressure Calibrators

The Yokogawa CA700 Portable Pressure Calibrator uses the same DPharp sensor technology as our EJA-E and EJX-A series pressure transmitters. It provides an accurate and efficient calibration and verification tool for any pressure transmitter or other type of field device.

Learn More

Communication Converters

Yokogawa offers communication converters by Moore Industries to convert secondary HART protocol variables to a 4 to 20 mA analog signal or all the HART variables to MODBUS RTU.

Learn More



Application Note

One of the most common applications for differential pressure transmitters is flow measurement. DPharp differential pressure transmitters have some unique signal conditioning features to eliminate instability at low flow rates.


Yokogawa DPharp EJA/EJX Pressure transmitters do not need frequent re-zeroing due to superior long term stability, it contributes to reduce maintenance time.


Field instruments are expected to be equipped with diagnostic functions to predict abnormal process conditions, and are also expected to expand these functions. The ability to extract diagnostic information for prediction and prevention from various physical process quantities measured by devices and make it available allows the user to reduce non-essential and non-urgent maintenance and thus cut maintenance costs.

Yokogawa Technical Report

Yokogawa Electric Corporation promotes the standardization of FOUNDATION™ fieldbus as the communication foundation supporting Asset Excellence for VigilantPlant, which is an approach aimed at the advancement of plant instruments and equipment. With the recent dramatic advancement of fieldbus technologies, information processing technologies, and network speed, it has become possible to process various kinds of information inside the field sensors and transmit the results to the distributed control system (DCS) and host computer.


Safe plant operation has long been pursued in all industries. Specifically, in the process automation industry which involves many hazardous elements, safety measures including explosion-protected systems have been adopted based on numerous tragic experiences.


Since the release of the DPharp EJ series in 1991 and the DPharp EJA series in 1994, nearly 1.2 million of these transmitters have been operating all over the world. Recently, we have also developed the EJX series of even more compact, lightweight and advanced transmitters with multi- sensing capabilities built using silicon resonant sensor technology.

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Yokogawa's cost-effective and user-friendly, differential pressure volumetric flow measurement with accuracy ranging from 0.5% to 1.5%, ensures efficient process control at a competitive price compared to other flow technologies.

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Discover the safety features built-in to the Yokogawa digital pressure sensors (DPharp).

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2D/3D Configurator


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