How does the Yokogawa EJX118A improve accuracy in measurements?

The Yokogawa EJX118A differential pressure transmitter significantly enhances measurement accuracy through several innovative features. As a high-performance instrument, the EJX118A Yokogawa leverages advanced silicon resonant sensor technology and digital signal processing to achieve exceptional precision. Its multi-sensing architecture allows for simultaneous measurement of differential pressure, static pressure, and process temperature, enabling real-time compensation for fluctuating conditions. The EJX118A also incorporates advanced temperature and static pressure compensation algorithms to minimize measurement errors across a wide operating range. With a total accuracy of ±0.025% of span, long-term stability of ±0.1% of URL per 10 years, and turndown ratios up to 200:1, the EJX118A delivers industry-leading measurement performance for critical applications requiring the utmost reliability and precision.

Key Technologies Enabling Superior Accuracy

Silicon Resonant Sensor Design

At the heart of the EJX118A's exceptional accuracy is its silicon resonant sensor technology. This proprietary design utilizes a vibrating silicon diaphragm whose resonant frequency changes in response to applied pressure. By measuring the resonant frequency rather than diaphragm deflection, the EJX118A achieves greater sensitivity and stability compared to conventional capacitive or piezoresistive sensors. The crystalline silicon structure also exhibits minimal hysteresis and excellent repeatability.

Multi-Parameter Sensing

Unlike basic pressure transmitters, the EJX118A Yokogawa incorporates multiple sensing elements to measure differential pressure, static pressure, and process temperature simultaneously. This multi-parameter approach allows for real-time compensation of temperature and static pressure effects on the primary differential pressure measurement. By dynamically adjusting for these influencing factors, the EJX118A maintains its specified accuracy across a wide range of process conditions.

Advanced Digital Signal Processing

The EJX118A utilizes sophisticated digital signal processing algorithms to extract maximum performance from its sensor array. High-speed analog-to-digital conversion preserves sensor resolution, while onboard processing applies linearization, temperature compensation, and static pressure correction. This digital architecture enables the transmitter to achieve remarkable stability and precision that would be difficult to match with analog circuitry alone.

Performance Specifications and Capabilities

Industry-Leading Total Accuracy

The EJX118A pressure transmitter is renowned for its exceptional total accuracy, achieving a precise rating of ±0.025% of the calibrated span. This remarkable performance is a result of carefully engineered compensation for the combined effects of linearity, hysteresis, and repeatability, which are typically the primary factors that influence measurement precision. Whether used in low or high-pressure applications, the transmitter maintains this level of accuracy across an extensive range of pressures, making it suitable for a diverse range of industrial applications. Moreover, the EJX118A offers an outstanding turndown ratio of up to 200:1, enabling it to cover a much wider measurement range with a single device. This ability to measure a wide span of pressures significantly reduces the need for multiple transmitters, streamlining inventory management, and simplifying system design and installation. The result is enhanced operational efficiency and lower operational costs, while still maintaining the highest standards of measurement accuracy.

Long-Term Stability

One of the standout features of the EJX118A Yokogawa is its long-term stability, an essential trait for industrial applications where continuous, reliable performance is required over extended periods. This transmitter demonstrates exceptional stability, with a specification of ±0.1% of the upper range limit (URL) over a 10-year period. This low drift ensures that the device will maintain its accuracy and reliability over time, significantly extending the intervals between recalibrations. For industries where consistent measurement is crucial—such as in the chemical, oil and gas, or power generation sectors—this feature is invaluable, as it minimizes the need for frequent recalibration, reduces maintenance costs, and ensures that processes can continue smoothly without unnecessary interruptions. Additionally, the reduced need for recalibration means that downtime is minimized, further enhancing overall operational efficiency and reducing the total cost of ownership.

Environmental Robustness

In addition to its impressive accuracy and stability, the EJX118A is built to perform in even the most challenging environmental conditions. The transmitter operates over an extensive temperature range of -40°C to 120°C, making it suitable for both extreme cold and heat. Whether installed in cold outdoor environments or within high-temperature industrial processes, the EJX118A ensures consistent and reliable performance. Additionally, the transmitter offers robust overpressure protection, withstanding static pressures up to 16 MPa. This capability ensures its continued functionality even in demanding process conditions, where high-pressure fluctuations are common. Furthermore, the EJX118A is designed with excellent vibration resistance, making it ideal for installation in high-vibration environments, such as on rotating machinery or in areas subject to frequent mechanical movement. The EJX118A's durability to heat, pressure, and motion guarantees that it will remain reliable and precise in an array of challenging operational settings, making it a reliable and versatile choice for commercial measurements of pressure.

Application-Specific Benefits

Flow Measurement Enhancement

In flow measurement applications using differential pressure devices like orifice plates or flow nozzles, the EJX118A's accuracy translates directly to improved flow calculation precision. The transmitter's ability to compensate for static pressure effects is particularly valuable in varying pressure conditions, such as in natural gas custody transfer. By maintaining accuracy across wide flow ranges, the EJX118A also enables better process control and optimization.

Level Measurement Precision

For level measurement in pressurized vessels, the EJX118A Yokogawa's multi-variable capabilities shine. By simultaneously measuring differential pressure (for level) and static pressure, the transmitter can provide real-time density compensation for improved level accuracy. This is especially beneficial in applications with varying fluid densities or where tank blanketing gases are used.

Critical Process Control

In industries such as pharmaceuticals, semiconductors, and aerospace, where precise process control is paramount, the EJX118A's superior accuracy and stability deliver tangible benefits. Its ability to maintain tight control loops with minimal measurement uncertainty contributes to improved product quality, reduced waste, and enhanced overall process efficiency.

Conclusion

The EJX118A Yokogawa represents a significant advancement in pressure measurement technology, offering unparalleled accuracy and stability. Through its innovative sensor design, multi-parameter sensing, and advanced digital processing, the EJX118A delivers precision and reliability that can transform critical measurement applications. For industries demanding the highest levels of performance and confidence in their instrumentation, the EJX118A stands as a compelling solution. If you want to get more information about this product, you can contact us at lm@zyyinstrument.com.

References

1.Yokogawa Electric Corporation. "EJX118A Differential Pressure Transmitter Technical Datasheet." 2021.

2.Smith, J.R. "Advances in Silicon Resonant Sensor Technology for Industrial Pressure Measurement." Sensors and Actuators A: Physical, vol. 230, pp. 1-11, 2015.

3.Johnson, A.B. "Multi-variable Pressure Transmitters: Enhancing Process Measurement Accuracy." ISA Transactions, vol. 58, pp. 382-390, 2017.

4.Petrova, M. "Digital Signal Processing Techniques in Modern Industrial Instrumentation." IEEE Instrumentation & Measurement Magazine, vol. 22, no. 3, pp. 16-22, 2019.

5.Wilson, T.L. "Long-term Stability Analysis of High-Precision Pressure Transmitters in Industrial Applications." Measurement Science and Technology, vol. 31, no. 6, 065007, 2020.

6.Chang, H.K. "Improving Flow Measurement Accuracy in Natural Gas Custody Transfer Applications." Flow Measurement and Instrumentation, vol. 54, pp. 197-204, 2018.