Yokogawa EJX115A Differential Pressure Transmitter: Technical Description
The Yokogawa EJX115A is a high-performance differential pressure transmitter designed for critical industrial applications where exceptional accuracy, reliability, and long-term stability are paramount. As part of Yokogawa's flagship EJX series, this transmitter incorporates advanced single-crystal silicon resonant sensor technology, which enables it to deliver precise and stable measurements in demanding process environments. The EJX115A is particularly suited for flow, level, and pressure applications across various industries, including oil and gas, chemical processing, power generation, and water treatment.
Core Technology and Performance
The EJX115A utilizes Yokogawa's innovative silicon resonant sensor technology, which consists of a single-crystal silicon sensor that resonates at a frequency proportional to the applied pressure. This technology ensures high accuracy, with typical performance reaching ±0.075% of the calibrated span. The transmitter offers excellent long-term stability, reducing the need for frequent recalibration and minimizing maintenance costs. Its robust design allows it to operate effectively in harsh conditions, including extreme temperatures (-50 to 120°C) and high static pressures (up to 42 MPa). The EJX115A covers a wide range of differential pressure measurements, from as low as 0.5 kPa to 14 MPa, making it versatile for various industrial applications.
| Category | Details |
| Product Name | Yokogawa EJX115A Differential Pressure Transmitter |
| Series | EJX Series (Flagship) |
| Type | Differential Pressure Transmitter |
| Core Technology | Single-crystal Silicon Resonant Sensor |
| Accuracy | ±0.075% of calibrated span |
| Long-Term Stability | Excellent; minimizes recalibration needs |
| Measurement Range | 0.5 kPa to 14 MPa (Differential Pressure) |
| Static Pressure Capability | Up to 42 MPa |
| Operating Temperature Range | -50 to 120 °C |
| Housing / Construction | All-welded stainless steel enclosure |
| Protection Ratings | IP67, NEMA 4X |
| Process Wetted Materials | Options include Hastelloy, Titanium, and other alloys (for corrosive applications) |
| Diagnostics | Heartbeat Technology (continuous self-diagnostics and verification) |
| Communication Protocols | HART, BRAIN, FOUNDATION Fieldbus, PROFIBUS PA |
| Resistance | High resistance to vibration, shock, and EMI |
| Applications | Flow (orifice plates, venturi tubes, nozzles), Level (tanks, vessels), Differential Pressure (filters, pumps, systems) |
| Industries | Oil & Gas, Chemical Processing, Power Generation, Water Treatment |
| Safety Compliance | SIL 2 (IEC 61508 / 61511) |
| Hazardous Area Approvals | ATEX, IECEx (explosive environment use) |
| Certifications | International safety and environmental resilience standards |
| User Features | Advanced diagnostics, simplified calibration, multi-protocol integration |
| Benefits | Improved process efficiency, reduced maintenance costs, enhanced safety |
| Special Advantages | Rugged design, versatile applications, future-proof solution |
Key Features and Capabilities
The EJX115A is equipped with advanced features that enhance its functionality and usability. It supports multiple communication protocols, including HART, BRAIN, FOUNDATION Fieldbus, and PROFIBUS PA, ensuring seamless integration into diverse control systems. The transmitter also incorporates Yokogawa's Heartbeat Technology, which provides continuous self-diagnostics and verification of device integrity without interrupting the process. This feature helps users monitor the health of the transmitter and detect potential issues early, thereby improving operational reliability and reducing downtime. The EJX115A is housed in a rugged, all-welded stainless steel enclosure with IP67 and NEMA 4X protection, making it suitable for use in challenging environments where exposure to moisture, dust, and corrosive substances is common.
Applications and Industries
The EJX115A is ideal for a wide range of applications, including flow measurement (e.g., via orifice plates, venturi tubes, or flow nozzles), level measurement in tanks and vessels, and differential pressure monitoring across filters, pumps, and other equipment. It is widely used in industries such as oil and gas (e.g., pipeline monitoring, refinery processes), chemical processing (e.g., reactor pressure control, distillation columns), power generation (e.g., boiler feedwater systems, steam turbine monitoring), and water treatment (e.g., pump control, filtration systems). Its high accuracy and reliability make it particularly valuable in safety-critical applications and processes where precise pressure measurement is essential for efficiency and product quality.
Safety and Certifications
The EJX115A complies with international safety standards and holds certifications such as SIL 2 (Safety Integrity Level) according to IEC 61508/61511, making it suitable for use in safety instrumented systems. It also meets ATEX and IECEx requirements for hazardous area applications, ensuring safe operation in potentially explosive environments. Additionally, the transmitter is designed to adhere to industry standards for environmental resilience, including resistance to vibration, shock, and electromagnetic interference.
Conclusion
The Yokogawa EJX115A differential pressure transmitter combines cutting-edge sensor technology, robust construction, and advanced diagnostics to deliver unparalleled performance in industrial settings. Its high accuracy, reliability, and versatility make it an ideal choice for critical applications where precise pressure measurement is crucial. With features like Heartbeat Technology and support for multiple communication protocols, the EJX115A helps users achieve improved process efficiency, reduced maintenance costs, and enhanced operational safety. Whether in oil and gas, chemical, power, or water industries, the EJX115A stands out as a reliable and future-proof solution for demanding differential pressure measurement tasks.
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