Yokogawa EJX110A Differential Pressure Transmitter
Overview
The Yokogawa EJX110A Differential Pressure Transmitter is a premium-performance member of Yokogawa’s EJX-A series, built around the company’s proprietary DPharp resonant silicon sensor technology. Designed for demanding differential pressure, flow, and level measurement applications, the EJX110A delivers industry-leading accuracy, long-term stability, and fast response time in a rugged four-bolt pressure-retaining housing suited to refineries, gas plants, and process utilities across the region.
In Oman and the GCC, Seven Star LLC supplies the Yokogawa EJX110A Differential Pressure Transmitter on request, with manufacturer documentation and technical backing. Facilities across Muscat, Sohar, and Salalah rely on Seven Star LLC to source Yokogawa instrumentation, with lead time and availability confirmed at quotation.
Measurement Principle
At the heart of the Yokogawa EJX110A is a single-crystal silicon resonant sensor that flexes under applied differential pressure, shifting the resonant frequency of two silicon oscillators etched onto the sensor diaphragm. This frequency shift is measured digitally rather than through an analog strain-gauge bridge, giving the DPharp sensor exceptional resistance to temperature drift, vibration, and long-term degradation while delivering a reference accuracy of ±0.04% of span. Because the measurement is inherently digital at the sensor level, the EJX110A avoids the noise and calibration drift that affect capacitive and piezoresistive sensor designs used in older-generation transmitters.
The transmitter simultaneously measures static pressure from the same sensor assembly, allowing the EJX110A to digitally compensate for static pressure and temperature effects in real time and maintain accuracy across its full 200:1 rangeability. With a 90-millisecond response time and long-term stability rated at ±0.1% of URL per 15 years, the EJX110A is well suited to fast-responding flow and level control loops where measurement lag directly affects process control quality, as well as custody-transfer and safety-instrumented applications where certified accuracy and stability over years of service are non-negotiable.
Engineering Design of the Yokogawa EJX110A
The EJX110A is built around a four-bolt pressure-retaining sensor module rated to a maximum working pressure of 3,600 psi, with the DPharp sensor isolated from the process by welded metal diaphragms and fill fluid, protecting the resonant silicon element from direct process contact while still delivering fast dynamic response. A local digital indicator, universal mounting bracket compatible with both liquid and gas service, and an over-pressure protection design rated to the full 3,600 psi limit round out a transmitter built for continuous duty in harsh industrial environments.
The transmitter supports Local Parameter Setting (LPS) for on-site range and configuration adjustment without a separate communicator, and its self-diagnostic routine runs 40 separate internal checks – including Yokogawa’s patented back-check technology – to continuously validate sensor and electronics health. The EJX110A carries Exida and TUV SIL2/SIL3 certification under IEC 61508 and IEC 61511, together with NEPSI and UKEX hazardous-area approvals, making it suitable for installation in classified Zone 0/1/2 areas throughout Oman’s oil, gas, and petrochemical infrastructure.
Key Features
Engineers specifying the Yokogawa EJX110A benefit from a feature set that combines DPharp resonant silicon sensing with a rugged, field-proven mechanical design for demanding process measurement duty.
- The Yokogawa EJX110A’s DPharp single-crystal silicon resonant sensor delivers ±0.04% of span reference accuracy with exceptional long-term stability.
- Simultaneous differential and static pressure measurement from a single sensor enables real-time digital compensation across a 200:1 rangeability.
- 90-millisecond response time supports fast flow and level control loops where measurement lag affects process quality.
- 40 internal self-diagnostic checks, including patented back-check technology, continuously validate sensor and electronics integrity.
- Local Parameter Setting (LPS) allows on-site range and configuration adjustment without a separate handheld communicator.
- Supports HART, FOUNDATION Fieldbus, PROFIBUS PA, BRAIN, ISA100, and Modbus communication protocols.
- Exida and TUV certified SIL2/SIL3 capable under IEC 61508 and IEC 61511 for safety-instrumented system integration.
- Four-bolt pressure-retaining design rated to 3,600 psi maximum working pressure with universal gas/liquid mounting.
Industrial Applications
The Yokogawa EJX110A is deployed across differential pressure flow measurement, closed and open tank level measurement, density monitoring, and general process pressure applications in oil and gas production, refining, petrochemical processing, and power generation. Its DPharp sensor technology and SIL-rated design make it a preferred choice for safety-instrumented systems, custody-quality flow metering skids, and critical level control loops where measurement stability over years of continuous operation is essential to plant safety and product quality.
In Oman and the GCC, Seven Star LLC supplies the Yokogawa EJX110A to engineering, procurement, and construction contractors, oilfield service companies, and plant maintenance teams across the Sultanate of Oman and the wider GCC. From the Sohar and Salalah free zones to upstream oil and gas facilities and offshore platforms in the Arabian Sea, Seven Star LLC provides Yokogawa differential pressure transmitters with manufacturer documentation and responsive regional technical support.
Technical Specifications
The Yokogawa EJX110A is available in multiple calibrated ranges and process connection options; the table below summarizes its core specifications.
| Parameter | Specification |
|---|---|
| Model | Yokogawa EJX110A |
| Sensor Technology | DPharp single-crystal silicon resonant sensor |
| Reference Accuracy | ±0.04% of span (±0.025% option available) |
| Rangeability | 200:1 |
| Long-Term Stability | ±0.1% of URL per 15 years |
| Response Time | 90 milliseconds (primary variable) |
| Maximum Working Pressure | 3,600 psi |
| Output Protocols | HART, FOUNDATION Fieldbus, PROFIBUS PA, BRAIN, ISA100, Modbus |
| Safety Certification | Exida and TUV SIL2/SIL3 per IEC 61508/IEC 61511 |
| Hazardous Area Certification | NEPSI, UKEX, and global explosion-protection ratings |
| Typical Applications | Differential pressure flow, level, density, and process pressure measurement |
Request a Quote for Yokogawa EJX110A
The Yokogawa EJX110A remains one of the most specified differential pressure transmitters in the region, and facilities throughout Oman and the GCC can request a formal quotation directly from Seven Star LLC, with lead time confirmed at quotation, technical datasheet downloads, and full support from our instrumentation division. In Oman and the GCC, Seven Star LLC helps ensure every unit supplied has the correct range and protocol configuration, and provides the local technical support needed to keep critical differential pressure measurement loops running without interruption. Contact our sales engineering team today to specify the correct range, certification, and communication protocol for your application.
Browse the full Yokogawa range or see more Pressure Instrumentation products supplied by Seven Star LLC in Oman and the GCC.
- datasheet Yokogawa EJX110A Datasheet Download
Yokogawa product families on this page
Pressure is covered by the DPharp transmitters: the EJX110A differential pressure transmitter, the EJX530A and EJA530E in-line gauge pressure transmitters and the EJX910A multivariable transmitter. The ADMAG AXW is the magnetic flowmeter line, and the YTA610 and YTA710 are temperature transmitters. Analyzers include the FLXA402 four-wire and FLXA21 two-wire liquid analyzers, the TDLS8000 tunable diode laser gas analyzer and spare parts for zirconia oxygen analyzers, such as the E7042UD cell assembly kit for the ZR22 detector. Control hardware includes CENTUM VP I/O modules like the ADV161 digital input module and the YS1700 programmable indicating controller.Where Yokogawa instruments are used
EJA and EJX transmitters measure pressure, level and DP flow throughout oil and gas, chemical and power plants. Zirconia oxygen analyzers and the TDLS8000 are used for combustion control on boilers and fired heaters. FLXA analyzers monitor pH, conductivity and dissolved oxygen in water and process streams, and CENTUM modules are bought as replacements for running control systems.Ordering Yokogawa parts: what we need
Send the model and suffix code and the serial number from the nameplate, and for CENTUM modules the style code as well. For transmitters without a code we need span, output protocol, wetted materials, process connection, housing and the approval required. For oxygen analyzer spare parts give the detector and converter models, for example ZR22G and ZR402G, and the part number.Browse Yokogawa products by category: PLC & I/O Cards, Flowmeters, Pressure Instrumentation, Automation Accessories, Temperature Instrumentation.
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