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 the official trusted supplier and regional supplier for Yokogawa, Seven Star LLC proudly supplies the EJX910A Multivariable Transmitter to process plants, refineries, and utility operators across the Sultanate of Oman and the wider GCC, backed by genuine factory warranty, calibration support, and local technical service.

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 regional stock availability 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.

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 held in regional stock for rapid deployment. In Oman and the GCC, Seven Star LLC maintains regional warehouse stock for common configurations, provides the official technical datasheet on request, and connects customers directly with our instrumentation division for manifold selection, primary-element sizing, and commissioning support. Contact Seven Star LLC today to receive a competitive quotation backed by genuine factory warranty and local technical support.

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