Yokogawa EJX910A Multivariable Transmitter
Overview
The Yokogawa EJX910A is a multivariable transmitter that consolidates differential pressure, static (line) pressure, and process temperature measurement into a single field device, then computes compensated mass or volumetric flow internally. Built on Yokogawa’s DPharp single-crystal silicon resonant sensor technology, the EJX910A eliminates the need for three separate transmitters and an external flow computer in orifice-plate and averaging pitot tube applications, cutting installation cost, wiring runs, and maintenance points while improving the overall accuracy of the flow calculation.
As a supplier of Yokogawa products, Seven Star LLC supplies the EJX910A Multivariable Transmitter to process plants, refineries, and utility operators across the Sultanate of Oman and the wider GCC, backed by local technical support with selection and specification.
Measurement Principle
The Yokogawa EJX910A uses a single-crystal silicon resonant sensor (DPharp) that converts applied differential and static pressure into a resonant frequency shift, a mechanism that is inherently more stable and repeatable over time than strain-gauge or capacitive designs. A dedicated RTD input captures process temperature simultaneously. All three raw variables – differential pressure, static pressure, and temperature – are digitized and processed by an internal microprocessor running the flow compensation algorithm associated with the connected primary element, whether an orifice plate, averaging pitot tube, nozzle, or Venturi.
Because pressure and temperature compensation happen inside the same housing that senses the differential pressure, signal transmission delay and calculation error introduced by separate devices are removed. The practical result for the end user is a single 4-20 mA/HART, FOUNDATION Fieldbus, or Modbus RS485 output that already represents fully compensated mass flow, with static pressure and temperature available as secondary variables for asset monitoring, without any additional flow computer, extra cabling, or extra points of potential failure.
Engineering Design of the Yokogawa EJX910A
The Yokogawa EJX910A is available with L, M, or H capsule ranges to match the differential pressure span of the installed primary element, with a maximum working pressure of up to 3,600 psi (250 bar) on the M/H capsules and a burst pressure rating of 10,000 psi across the range. Process connections follow IEC 61518 3-valve and 5-valve manifold standards in T-style, H-style, wafer-style, and bottom-connection configurations, allowing the transmitter to be fitted directly to existing orifice flange taps or pitot tube tap arrangements without custom piping.
The electronics housing is available in standard aluminum alloy or optional stainless steel, rated to the same explosion-proof, flameproof, and intrinsically safe certifications as the rest of the EJX series, and the local digital indicator can be rotated in 90-degree increments for readability from any installation orientation. Configuration is performed through Yokogawa’s FieldMate FlowNavigator software, which walks the technician through primary-element data entry, unit selection, and range setting via an FDT/DTM interface, and allows a validated configuration to be copied across multiple identical installations to reduce commissioning time on multi-run metering skids.
Key Features
The Yokogawa EJX910A brings together several engineering advantages that make it a preferred choice for compensated flow measurement across the GCC process industry:
- Combines differential pressure, static pressure, and temperature measurement in one transmitter, eliminating the separate flow computer traditionally required for orifice and averaging pitot tube metering.
- DPharp silicon resonant sensor technology delivers differential pressure accuracy of ±0.04% of span and static pressure accuracy of ±0.1% of span, supporting mass flow accuracy of ±1.0% of range.
- Fast response time of 200-230 ms on the differential pressure signal suits dynamic custody transfer and allocation metering duties.
- Supports HART (revision 5 or 7), FOUNDATION Fieldbus, and Modbus RS485 protocols, plus an optional ISA100 wireless adapter for retrofit metering points without new cable runs.
- IEC 61518-compliant manifold compatibility allows direct mounting to existing orifice and pitot tube tap arrangements in T-style, H-style, wafer-style, or bottom-connection formats.
- Maximum working pressure up to 3,600 psi and burst pressure of 10,000 psi provide a wide safety margin for high-pressure gas and steam service.
- FieldMate FlowNavigator configuration software simplifies primary-element setup and allows validated settings to be replicated across multiple identical flow runs.
- SIL2/SIL3-capable design supports use in safety instrumented systems for critical flow monitoring loops.
Industrial Applications
The Yokogawa EJX910A is widely applied wherever compensated mass or volumetric flow must be derived from a differential-pressure primary element, including natural gas custody transfer and allocation metering, steam flow measurement in power and district cooling plants, compressed air metering in industrial utility systems, and hydrocarbon flow measurement in upstream and midstream oil and gas facilities. Its ability to output fully compensated flow without an external flow computer makes it particularly valuable on remote wellhead pads and unmanned metering skids where minimizing panel space and wiring is a priority.
As the trusted supplier for Yokogawa, Seven Star LLC distributes the EJX910A to oil and gas operators, refineries, district cooling providers, and utility companies throughout Oman, including projects supported from the Sohar and Salalah economic zones, as well as broader GCC markets, with lead time confirmed at quotation and application engineering support for primary-element sizing and manifold selection.
Technical Specifications
The table below summarizes the principal specifications of the Yokogawa EJX910A Multivariable Transmitter, confirming why the Yokogawa EJX910A is specified on demanding custody transfer projects.
| Parameter | Specification |
|---|---|
| Model | Yokogawa EJX910A |
| Measured Variables | Differential pressure, static pressure, process temperature (RTD), compensated mass/volumetric flow |
| Differential Pressure Accuracy | ±0.04% of span |
| Static Pressure Accuracy | ±0.1% of span |
| Mass Flow Accuracy | ±1.0% of range |
| External Temperature Accuracy | ±0.9°F (±0.5°C) |
| Maximum Working Pressure | 2,300 psi (L-capsule); 3,600 psi (M/H capsule) |
| Burst Pressure | 10,000 psi (all capsules) |
| Response Time | 200-230 ms |
| Process Connection | IEC 61518 3-valve / 5-valve manifolds; T-style, H-style, wafer-style, bottom connection |
| Output / Protocols | 4-20 mA HART (rev 5/7), FOUNDATION Fieldbus, Modbus RS485, optional ISA100 wireless |
| Housing Material | Low-copper aluminum alloy or optional stainless steel |
| Configuration Software | FieldMate FlowNavigator (FDT/DTM) |
Request a Quote for Yokogawa EJX910A
Seven Star LLC invites engineering, procurement, and instrumentation teams across Oman and the GCC to submit a formal request for quotation for the Yokogawa EJX910A Multivariable Transmitter. The Yokogawa EJX910A is supplied on request, with lead time confirmed at quotation. In Oman and the GCC, Seven Star LLC supplies common configurations on request, provides the manufacturer technical datasheet on request, and connects customers directly with our instrumentation division for manifold selection and primary-element sizing support. Contact Seven Star LLC today to receive a competitive quotation with current lead time and local technical support.
Browse the full Yokogawa range or see more Pressure Instrumentation products supplied by Seven Star LLC in Oman and the GCC.
- datasheet Yokogawa EJX910A 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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