| Customization: | Available |
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| Type: | Automation Equipment |
| Structure Type: | Strain Gauge Pressure Transmitter |
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Yokogawa EJA120E Differential Pressure Transmitter: Comprehensive Product Overview
1. Introduction
The Yokogawa EJA120E is a high-performance micro-differential pressure transmitter designed for precision measurement in industrial applications. As part of the EJA-E series, it belongs to the DPharp (Digital Sensor High Accuracy and Reliability Platform) family, which combines advanced sensor technology with robust construction for long-term reliability. Released in 2012, the EJA120E is tailored for low differential pressure measurement scenarios, such as flow, level, density, and pressure monitoring in liquids, gases, or steam .
Key industries benefiting from the EJA120E include oil and gas, chemical processing, power generation, and water treatment. Its design emphasizes accuracy, stability, and adaptability to harsh environments, making it a preferred choice for critical process control applications.
2. Key Features
2.1 Advanced Sensor Technology
Single-Crystal Silicon Resonant Sensor: The EJA120E leverages Yokogawa's proprietary DPharp digital sensor technology, which offers twice the performance and stability of traditional analog sensors. This active sensor continuously generates a signal, even in static process conditions, enabling real-time monitoring and fault detection .
High Accuracy: With a base accuracy of ±0.2% of span (upgradable to ±0.09% using the /HAC option), it ensures precise measurement across its operational range
Stability: Long-term stability is rated at ±0.3% per year, reducing the need for frequent recalibration .
2.2 Communication and Protocol Flexibility
The EJA120E supports multiple communication protocols to integrate seamlessly into diverse control systems:
HART 5/7, BRAIN, and 1-5V DC HART 7 (Low Power) for analog systems.
FOUNDATION™ Fieldbus and PROFIBUS PA for digital bus networks
. This versatility allows users to adopt the protocol best suited to their plant's infrastructure.
2.3 Diagnostics and Safety
Self-Diagnostic Functions: Over 40 self-checks monitor hardware, CPU, and configuration errors. Unique features like Back-check Technology validate all calculations in real time, while active sensor monitoring ensures immediate fault detection .
SIL Certification: Compliant with IEC 61508 standards, the EJA120E meets SIL 2 for single-use and SIL 3 for redundant configurations, enhancing safety in critical processes .
2.4 Environmental Resilience
Wide Operating Range: Functions reliably in temperatures from -25°C to 80°C (-13°F to 176°F) and withstands process pressures up to 50 kPa (7.25 psi)
Robust Construction: Features IP66/IP67 and NEMA 4X ratings for dust/water resistance, along with corrosion-resistant materials like 316L SST and Hastelloy C-276 for wetted parts
3. Technical Specifications
3.1 Measurement Parameters
Measurement Range: ±1 kPa (±4 inH2O), with a minimum span of 0.1 kPa (0.4 inH2O)
Response Time: 150 ms, ensuring rapid feedback for dynamic processes .
Damping Adjustment: Configurable via software from 0.00 to 100.00 seconds to filter noise in fluctuating environments
3.2 Electrical and Output Specifications
Output Signals:
4-20 mA DC with HART/BRAIN protocols (two-wire system).
1-5V DC HART (three- or four-wire system) for low-power applications
Power Supply:
10.5-42V DC for standard and explosion-proof models.
9-32V DC for Fieldbus configurations
3.3 Mechanical Design
Mounting: Compatible with 2-inch pipe installations, available in vertical or horizontal orientations with optional brackets
Housing Materials: Options include cast aluminum, anti-corrosion aluminum, and stainless steel (ASTM CF-8M)
| Parameter | Specification |
| Model | EJA120E Differential Pressure Transmitter |
| Measurement Range | Span: 0.1-1 kPa (0.4-4 inH2O)Range Limits: -1 to 1 kPa (-4 to 4 inH2O) |
| Accuracy | ±0.2% of span (standard)±0.09% of span (with /HAC option) |
| Output Signal | - 4-20 mA DC (HART/BRAIN protocols)- 1-5 V DC (HART low-power)- FOUNDATION™ Fieldbus / PROFIBUS PA (digital protocols)Output Limits: 3.6-21.6 mA / 0.9-5.4 V DC |
| Communication Protocols | BRAIN, HART (1-5V), FOUNDATION™ Fieldbus, PROFIBUS PA |
| Power Supply | BRAIN/HART: 10.5-42 V DC (standard)- Fieldbus: 9-32 V DC- HART Low Power: 9-28 V DC |
| Environmental Conditions | Temperature:- Ambient: -25°C to +80°C (-13°F to +176°F)- Process: -25°C to +80°CHumidity: No condensation allowed |
| Operating Pressure | ±50 kPa (±7.25 psi) |
| Response Time | 150 ms (including 45 ms dead time) |
| Damping Time Constant | Adjustable from 0.00 to 100.00 sec |
| Mounting Position Effect | Zero shift ≤0.4 kPa (1.6 inH2O) when tilted 90° (correctable via zero adjustment) |
| Enclosure Rating | IP66/IP67, NEMA 4X |
| Explosion Proof | NEPSI, FM, ATEX, CSA, IECEx |
| Housing Material | Cast aluminum, corrosion-resistant aluminum, or ASTM CF-8M stainless steel |
| Stability | ±0.3% URL/year |
| Diagnostics | Self-diagnostics for CPU failure, hardware faults, configuration errors, and over-limit conditions |
| Certifications | SIL 2 (excluding Fieldbus/PROFIBUS PA models), CE, RoHS |
4. Applications
The EJA120E is ideal for:
Flow Measurement: Orifice plates, venturi tubes, and pitot tubes in pipelines.
Level Monitoring: Open/closed tanks with liquid or granular media.
Density and Pressure Control: In processes requiring consistent fluid properties.
Environmental Systems: HVAC and ventilation pressure monitoring .
5. Installation and Configuration
5.1 Mounting Guidelines
Orientation: Zero drift is minimized when the transmitter is mounted parallel to the diaphragm plane. A 90° tilt may cause a 0.4 kPa zero shift, which is correctable via software
Impulse Piping: Ensure proper routing to avoid vapor traps in gas applications or sediment accumulation in liquid systems
5.2 Configuration Tools
Local Parameter Setting (LPS): Adjust parameters like tag name, range, and damping via the integrated LCD display and pushbuttons .
Remote Configuration: Use Yokogawa's FieldMate software or HART communicators for seamless setup .
6. Advantages Over Competitors
6.1 Superior Sensor Performance
The DPharp sensor's digital architecture outperforms analog sensors in accuracy and longevity, reducing lifecycle costs .
6.2 Enhanced Diagnostics
Competitors lack Yokogawa's Back-check Technology and active sensor monitoring, which preemptively identify issues like sensor degradation .
6.3 Safety and Compliance
All EJA120E units are SIL-ready without requiring additional options, unlike many alternatives .
7. Certifications and Standards
Explosion Protection: Certified by FM, ATEX, IECEx, and CSA for hazardous environments
EMC Compliance: Meets IEC 61326 for electromagnetic compatibility
NAMUR NE43: Supports output limiting for abnormal process conditions
8. Maintenance and Support
Self-Calibration: Zero-point adjustment can be performed onsite without process interruption
Data Logging: Optional microSD cards enable trend analysis and troubleshooting .
Global Support: Yokogawa's lifecycle services include technical assistance, spare parts, and firmware updates .
9. Conclusion
The Yokogawa EJA120E sets the benchmark for micro-differential pressure transmitters, combining cutting-edge technology with rugged reliability. Its adaptability to diverse protocols, environments, and safety requirements makes it indispensable for modern industrial automation. By minimizing downtime and maximizing measurement integrity, the EJA120E delivers a compelling return on investment for industries demanding precision and durability.
For detailed installation diagrams, wiring guides, or custom configuration support, refer to Yokogawa's official manuals or authorized distributors
Company Advantages of KeRui (WeiFang) Automation Equipment Co., Ltd.
KeRui (WeiFang) Automation Equipment Co., Ltd. is a leading manufacturer and innovator in industrial automation solutions, specializing in pressure transmitters, flowmeters, handheld communicators, valve positioners, and related instrumentation. With decades of expertise and a global reputation for quality, we are committed to delivering cutting-edge products tailored to meet diverse industrial demands. Below are our core competitive advantages:
1. Advanced Technology & Precision Engineering
High-Accuracy Pressure Transmitters: Our pressure transmitters achieve ±0.075% reference accuracy (digital) and ±0.1% (analog), ensuring reliable measurements even in extreme conditions (-40°C to 150°C). Leveraging 18-bit ADC technology, they minimize environmental temperature drift for long-term stability. Smart Flowmeters: Our variable area flowmeters (e.g., ZYZZ series) feature geomagnetic compensation, LCDs, and Exd II CT6 explosion-proof certification, suitable for hazardous environments like oil & gas and chemical plants.Valve Positioners with Auto-Calibration: Equipped with Foundation Fieldbus protocol compatibility, our valve positioners enable automatic zero/span adjustment and reduce commissioning time by 50%, ensuring optimal control loop performance
2. Robust Quality Control & Certifications
ISO 9001 & API Compliance: Adhering to ISO 9001:2015 and API standards, we implement rigorous quality checks from raw material selection to final testing. Durable Construction: Products feature 316L stainless steel, PTFE/PFA coatings, and IP67/IP68 protection, ensuring corrosion resistance and longevity in harsh environments. Global Certifications: Our devices meet ATEX/IECEx, SIL 2/3, and NAMUR NE 21/43 standards, making them compatible with international safety and regulatory requirements
3. Customization & Versatility
Tailored Solutions: We offer custom sensor matching (e.g., RTD, thermocouple) and output signal customization (4-20mA, HART, PROFIBUS) to align with specific application needs Wide Application Coverage: Products are designed for industries including oil & gas, water treatment, chemical processing, and HVAC systems, with flowmeters supporting flow rates from 20Nm³/h to 5000Nm³/h Multi-Function Handheld Communators: Our handheld devices provide intuitive configuration, real-time diagnostics, and PID control integration, streamlining field operations.
4. Innovation & R&D Excellence
In-House R&D Team: With 6+ dedicated engineers, we continuously innovate in materials (e.g., H-alloy sensors) and software (e.g., predictive maintenance algorithms).Smart Features: Products integrate self-diagnostic alerts (e.g., sensor drift detection) and IoT readiness, enabling seamless integration into Industry 4.0 systems.
5. Efficient Production & Global Service
Large-Scale Manufacturing: Operating 7 production bases with 5,000+ annual capacity, we ensure fast delivery and cost-effectiveness Comprehensive Support: Our 51% localized overseas teams provide 24/7 technical assistance, onsite training, and spare parts supply Warranty & Traceability: All products come with a 1-year warranty and full lifecycle traceability, backed by digital documentation for easy maintenance.
6. Sustainable & User-Centric Design
Energy Efficiency: Devices like low-power flowmeters (3.6V lithium battery option) reduce operational costs
Ergonomic Interfaces: Features like dual-indication displays (LCD + analog) and WAGO spring-clamp terminals simplify installation and reduce downtime.
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