Yokogawa EJA110E-JMS Differential Pressure Transmitter – EJA-E Series

Yokogawa EJA110E-JMS: Precision Differential Pressure Measurement for Critical Process Loops

The Yokogawa EJA110E-JMS is a two-wire, 4–20 mA differential pressure transmitter built on Yokogawa’s single-crystal silicon resonant sensor platform. Within a control loop, this transmitter occupies the field measurement node — converting process differential pressure into a calibrated analog signal and a superimposed HART digital stream that feeds directly into DCS or PLC analog input cards. Its role is not passive: the EJA110E-JMS actively participates in loop diagnostics, providing continuous sensor health status via NAMUR NE 107 classification, which allows the control system to distinguish between a genuine process deviation and an instrument fault without interrupting the control output.

In flow measurement applications using orifice plates, venturi tubes, or annubar elements, the EJA110E-JMS resolves the differential pressure signal with ±0.04% of calibrated span accuracy under reference conditions. This figure is not a peak specification — it is the sustained performance envelope across the full calibrated range, supported by a 10-year stability guarantee of ±0.1% URL. For level measurement in pressurized vessels, the transmitter’s 100:1 turndown ratio allows a single installed unit to cover the full operating range from minimum detectable level to maximum vessel height without hardware substitution.

The -JMS suffix designates the standard output configuration: 4–20 mA DC with HART 5 and HART 7 dual-protocol support. HART 7 multivariable output makes the static pressure, sensor temperature, and percent-of-range values simultaneously accessible alongside the primary DP variable — four process variables over a single two-wire cable, with no additional wiring cost.

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Technical Parameters

Hardware Logical Analysis

The EJA110E-JMS sensor capsule is machined from a single crystal of silicon — not a polycrystalline or bonded assembly. This matters because grain boundaries in polycrystalline materials are sites of mechanical hysteresis: under cyclic pressure loading, the crystal lattice at grain boundaries deforms non-elastically, introducing a measurement offset that shifts with each pressure cycle. A single-crystal structure eliminates grain boundaries entirely. The resonant frequency of the silicon beam changes in direct proportion to applied differential pressure, and this frequency signal is inherently digital — it does not require an analog-to-digital conversion stage that would introduce quantization noise or drift.

The transmitter’s EMC design addresses two distinct interference pathways. Conducted interference on the 4–20 mA loop is suppressed by a transient voltage suppressor (TVS) network at the terminal block, rated to absorb surge energy per IEC 61000-4-5 Level 3. Radiated interference from adjacent variable-frequency drives, welding equipment, or high-current bus bars is attenuated by the aluminum alloy housing, which provides approximately 20 dB of shielding effectiveness at frequencies above 30 MHz. The internal electronics are mounted on a conformal-coated PCB, preventing condensation-induced leakage currents that would otherwise corrupt the low-level frequency signal from the sensor capsule.

The HART modem within the EJA110E-JMS implements the Bell 202 FSK standard: a 1,200 Hz tone for logic 1 and a 2,200 Hz tone for logic 0, superimposed on the 4–20 mA carrier at ±0.5 mA amplitude. This amplitude is small enough that it does not perturb the analog control loop — a 250 Ω HART resistor in the loop converts the current modulation to a ±125 mV voltage signal readable by any HART master. The dual-protocol stack (HART 5 and HART 7) is stored in non-volatile flash memory and selected automatically based on the master device’s poll response, requiring no manual configuration switch.

The microprocessor executes a continuous self-test routine at 1-second intervals, checking sensor capsule resonant frequency against stored reference values, verifying EEPROM checksum integrity, and monitoring supply voltage against the 10.5 V minimum threshold. Any anomaly triggers a NAMUR NE 107 status bit in the HART device status byte — a structured diagnostic output that asset management systems can parse without operator intervention.

System Integration Benefits

• Deterministic Loop Scan Compatibility: The 4–20 mA output updates at 90 ms response time (standard damping = 0), well within the 250 ms scan cycle of most DCS analog input cards, ensuring no measurement latency is introduced into the control loop.
• Backward-Compatible HART Infrastructure: HART 5 compatibility means the EJA110E-JMS drops into existing wiring and junction boxes without replacing HART multiplexers or handheld communicators already deployed in the plant.
• Reduced Wiring Cost via Multivariable Output: HART 7 delivers static pressure and sensor temperature as secondary variables over the existing two-wire cable, eliminating the need for separate pressure and temperature transmitters in applications where both measurements are required.
• SIL 2 Loop Integration: The IEC 61508 SIL 2 certification with documented PFD (Probability of Failure on Demand) values allows the EJA110E-JMS to be incorporated directly into safety instrumented function (SIF) calculations without additional proof-test burden.
• NAMUR NE 107 Diagnostic Transparency: Four structured status signals (Failure, Out of Specification, Maintenance Required, Function Check) are mapped to HART device status bits, enabling the DCS to display instrument health on operator graphics without custom programming.
• 100:1 Turndown Without Recalibration: Span adjustment via HART command or local zero/span buttons does not require physical capsule replacement, reducing maintenance downtime and spare-parts inventory.
• Intrinsic Safety Barrier Compatibility: The 10.5 V minimum supply voltage is compatible with standard Zener barrier and galvanic isolator output voltages, simplifying Ex ia loop design in Zone 0/1 hazardous areas.
• Asset Management System Integration: The EJA110E-JMS is pre-registered in Yokogawa PRM, Emerson AMS, and ABB Asset Vision device libraries, allowing plug-and-play device description (DD) loading without manual HART DD file management.

Quality Assurance & Global Logistics

Every Yokogawa EJA110E-JMS unit offered through siemensplc.com is sourced from verified Yokogawa-authorized distribution channels or authenticated surplus inventory with full traceability documentation. Incoming inspection at our Xiamen facility covers three checkpoints: visual and nameplate verification against the Yokogawa model code matrix, serial number cross-reference against Yokogawa’s product registration database, and a functional loop test confirming 4.00 mA and 20.00 mA output endpoints within ±0.02 mA tolerance using a calibrated HART communicator and precision current meter.

Factory calibration certificates are retained on file and provided upon request. For applications requiring NIST-traceable recalibration prior to installation, third-party calibration can be arranged from our Xiamen base with a typical turnaround of 3–5 business days.

Logistics from Xiamen, China to global destinations are handled via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard transit times are 3–5 business days to Europe and North America, 2–3 business days to Southeast Asia and the Middle East. All shipments include a commercial invoice, packing list, and certificate of origin. Export classification is confirmed prior to shipment for compliance with applicable export control regulations. Units are packed in anti-static foam inserts within double-wall corrugated cartons, with humidity indicator cards included for moisture-sensitive configurations.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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