| Customization: | Available |
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| Type: | Differential Pressure Transmitter |
| Structure Type: | Pressure Transmitter |
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Yokogawa EJA118E Differential Pressure Transmitter Product Overview Comprehensive Technical Documentation for Industrial Measurement Solutions
1. Introduction
The Yokogawa EJA118E is a diaphragm-sealed differential pressure (DP) transmitter designed for precision measurement in demanding industrial environments. As part of the EJA-E series, it integrates the ruggedness of Yokogawa's legacy EJA-E line with the advanced performance of the EJX-A series, leveraging patented DPharp® (Digital High-Accuracy Resonant Pressure) sensor technology
This transmitter excels in applications involving high/low temperatures, viscous media, crystallization-prone fluids, and vacuum conditions, offering robust reliability and SIL 2/SIL 3 functional safety compliance
2. Technical Specifications
2.1 Core Performance Metrics
Measurement Types:
Primary Variable: Differential Pressure (DP)
Secondary Variable: Static Pressure (SP)
Accuracy:
DP: ±0.2% of calibrated span (M-Capsule: 40:1 turndown; H-Capsule: 20:1 turndown)
SP: ±0.5% of span for absolute pressure ≥1 MPa .
Response Time:
DP: 200 ms (including 45 ms dead time)
SP: 500 ms .
Output Signals:
4-20 mA DC (HART/BRAIN protocols) or 1-5 V DC (low-power HART)
Supports Foundation Fieldbus, PROFIBUS PA, and BRAIN communications
Power Supply: 10.5-42 V DC
2.2 Environmental & Mechanical Robustness
Operating Temperature: -40°C to 85°C (compensated range) .
Pressure Rating: Up to 500 kPa (H-Capsule) or 100 kPa (M-Capsule) .
Ingress Protection: IP54 (standard); IP67/IP68 (optional ruggedized versions)
Flange Standards: JIS 10K-30K, ANSI 100#-600#, DIN PN10-64, and JPI Class 150-600
2.3 Certifications & Compliance
Functional Safety: SIL 2 (single unit) / SIL 3 (redundant configuration) certified by TÜV and Exida
Explosion Protection: ATEX, IECEx, and FM approvals .
Material Compliance: NACE MR0175/MR0103 for corrosive environments .
3. Design Innovations
3.1 DPharp® Sensor Technology
The EJA118E employs Yokogawa's proprietary single-crystal silicon resonator, which measures DP, SP, and sensor temperature simultaneously. This "dynamic compensation" architecture mitigates temperature and static pressure effects, achieving 10x greater stability than conventional strain-gauge sensors . The active sensor design continuously generates signals, enabling real-time diagnostics and failure detection .
3.2 Diaphragm Seal System
Remote Seals: Isolate the sensor from process media using capillary tubes filled with silicone oil or other fill fluids. The inner diaphragm design supports 1-inch, 3/4-inch, or 1/2-inch flanges while maintaining 2-inch diaphragm performance .
Density Compensation: Active algorithms adjust for fill-fluid density variations caused by temperature fluctuations, ensuring accuracy in long capillary setups (up to 5 meters)
3.3 Advanced Diagnostics & User Interface
10-Segment Signal Characterization: Customizes 4-20 mA output linearization for non-linear applications (e.g., tank level measurement)
LCD Indicator: Displays DP, SP, percentage range, and bar graphs. Supports multi-language error codes for rapid troubleshooting .
Local Parameter Setting (LPS): Adjusts 9 critical parameters (e.g., range, damping) without a handheld communicator .
3.4 Structural Integrity
Four-Bolt Housing: Enhances mechanical stability and vibration resistance (tested to 20g per IEC 60068-2-6) .
Teflon-Coated Flanges: 316L stainless steel construction with dual seals (ANSI/ISA 12.27.01 compliant) resists corrosion and overpressure events .
| Parameter | Specification |
| Model | EJA118E |
| Type | Diaphragm-sealed differential pressure (DP) transmitter |
| Sensor Technology | DPharp® (Digital High-Accuracy Resonant Pressure) |
| Measurement Range | DP: 0.5-500 kPa (M-Capsule) / 1-5000 kPa (H-Capsule) |
| Turndown Ratio | 40:1 (M-Capsule) / 20:1 (H-Capsule) |
| Accuracy | ±0.2% of span (DP) / ±0.5% of span (SP, absolute pressure ≥1 MPa) |
| Long-term Stability | <0.1% URL/year |
| Response Time | 200 ms (DP) / 500 ms (SP) |
| Output Signal | 4-20 mA DC (HART/BRAIN) / 1-5 V DC (Low Power HART) / Foundation Fieldbus / PROFIBUS PA |
| Operating Temperature | -40°C to 85°C (ambient) |
| Process Temperature | -90°C to 400°C (dependent on flange/seal type) |
| Humidity | 0-100% RH (non-condensing) |
| Ingress Protection | IP54 (standard) / IP67/IP68 (optional) |
| Flange Standards | JIS 10K-30K / ANSI 100#-600# / DIN PN10-64 / JPI Class 150-600 |
| Process Connections | 1/2", 3/4", or 1" flanges (remote diaphragm seals) |
| Housing Material | Aluminum alloy (standard) / Stainless steel (optional) |
| Diaphragm Material | 316L stainless steel (standard) / Hastelloy® C-276 (optional) |
| Functional Safety | SIL 2 (single) / SIL 3 (redundant) (TÜV, Exida) |
| Explosion Protection | ATEX, IECEx, FM, CSA |
| Corrosion Resistance | NACE MR0175/MR0103 |
| Protocols | BRAIN, HART 5/7, Foundation Fieldbus H1, PROFIBUS PA |
| Diagnostics | Real-time membrane fouling detection, overpressure alerts, sensor health monitoring |
| Voltage Range | 10.5-42 V DC (4-20 mA) / 10.5-30 V DC (Fieldbus/PROFIBUS) |
| Power Consumption | ≤3.6 W |
| Display | LCD with bar graph, multi-language error codes |
| Local Parameter Adjustment | LPS (Local Parameter Setting) for 9 parameters (range, damping, output mode, etc.) |
| Density Compensation | Automatic adjustment for fill-fluid density variations |
4. Application Scenarios
4.1 Flow Measurement
Ideal for orifice plates, venturi tubes, and flow nozzles in oil & gas, chemical, and power plants. The high turndown ratio (40:1) accommodates wide flow ranges without recalibration
4.2 Level & Density Monitoring
Sealed Tanks: Measures liquid level in pressurized or vacuum vessels (e.g., LPG storage).
Interface Detection: Distinguishes between immiscible liquids (e.g., oil/water) using density differentials
4.3 Challenging Media
High-Viscosity Fluids: Remotely mounted seals prevent clogging in asphalt or polymer processes.
Crystallizing Solutions: Diaphragm seals avoid sensor contamination in caustic soda or sugar refining
5. Competitive Advantages
5.1 Operational Efficiency
Predictive Maintenance: Integrated FFT analysis detects membrane fouling, extending service intervals by 40% .
Calibration Interval: Long-term stability (<0.1% URL drift over 10 years) minimizes recalibration frequency
5.2 Safety & Compliance
Overpressure Protection: Mechanical safeguards and software limits prevent sensor damage during pressure surges .
SIL 3 Readiness: Dual transmitters meet safety-critical requirements in nuclear or offshore platforms .
5.3 Connectivity
FieldMate® Compatibility: Yokogawa's software platform enables centralized configuration and data logging .
IoT Integration: ISA100 Wireless modules support edge computing for predictive analytics .
6. Conclusion
The Yokogawa EJA118E redefines industrial pressure measurement with its fusion of precision, durability, and smart functionality. Its DPharp® sensor, SIL 3 compliance, and adaptive signal processing make it indispensable for industries prioritizing operational safety and efficiency. For detailed specifications, refer to Yokogawa's official documentation .
The packaging and transportation of instrumentation in global trade hinges on a synergy of advanced materials, rigorous testing, regulatory compliance, and smart logistics. By adopting hybrid structural designs, leveraging real-time monitoring technologies, and prioritizing sustainability, exporters can ensure the safe, efficient, and cost-effective delivery of precision instruments. Continuous innovation in materials science and IoT integration will further redefine industry standards, enhancing resilience in an increasingly interconnected market.
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A: Do not worry about the package, we have rich experience in packing, and all our package is wooden case package.
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A: Yes, we have materials in stock to help you to get the samples as soon as we can.
Q: What is the MOQ?
A:1PC.
Q: Can I get a lower price if I order large quantities?
A: Yes, cheaper prices with more bigger size orders.
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