Skip navigation
Go to Global Navigation
Go to Primary Contents
Go to Site Information





2003 Press Releases-19

Tokyo, Japan - October 21, 2003

Yokogawa Develops DPharp EJX Series of Differential Pressure and Pressure Transmitters

- Strategic New Products for the Global IA Business -

Yokogawa Electric Corporation announces that it has developed the DPharp EJX Series of differential pressure and pressure transmitters. The new DPharp EJX transmitters to be added to the current EJA Series of the Dpharp family will be launched during 2003 as strategic new products that will target the global industrial automation (IA) business.

The DPharp EJX Series employs a next-generation multi-sensing technology that provides a level of performance that is substantially superior to previous models. For example, this new series can simultaneously measure both differential pressure and static pressure.

Differential pressure and pressure transmitters measure the flow of gases, steam and liquid, and tank level, and are the most common type of sensors used for this purpose. They represent the largest market for sensors used in the field, estimated at $1.3 billion in global sales, with approximately 1.5 million units sold per year. Yokogawa currently has the second largest share (20%) of this market.

The new product's delivery of cost-efficient ultra-high performance promises to radically alter the competitive landscape, and Yokogawa believes that the DPharp EJX Series will increase its share of the sensor market to 30% by 2005.

With its highly regarded distributed control system and the DPharp EJX Series, Yokogawa is aiming to secure global pre-eminence in the IA sector.

Product Features

1. Multi-sensing
The evolution of the silicon resonant sensor has enabled the simultaneous
measurement of differential pressure and static pressure with a single sensor. This is a world first.

2. Multivariables
The mass flow rate can be measured by inputting process temperatures from external
temperature sensors.

3. High accuracy
This series has two levels of accuracy, Standard and Reference Class. The Standard type delivers ±0.04% accuracy, and the Reference Class type hones accuracy down to ±0.025%, the highest level of precision ever provided.

The EJX Series also introduces Total Accuracy, a pioneering concept that provides a comprehensive performance evaluation benchmark. Total Accuracy incorporates the conditions of the actual usage environment such as ambient temperature, static pressure and overpressure that affect measurement accuracy.

4. High-speed response
This product has a response time of 95 milliseconds, making it the fastest smart model in the world.

5. Diagnostic feature
This series has a diagnostic feature that detects blockages in an impulse line.

6. Compliance with Safe Instrumentation Standards
Yokogawa plans to obtain the Safety Integrity Level 2 (SIL2) certificate for the IEC61508 safety standard from TÜVIT.

"In 1991 we developed a silicon resonant sensor using MEMS* technology," says Toshio Kimura, Senior Vice President of the Control Products Business Headquarters. "This allowed us to introduce digital sensing technology into the area of differential pressure and pressure transmitters that had previously only been analog. The sensors in the DPharp Series use a principle of measurement that is completely different from previous models, ensuring greater accuracy and stability. After more than 10 years on the market, we now have 1.2 million transmitters operating throughout the world.”

"Yokogawa puts itself in the customer's shoes and aims to provide a continuous supply of the most appropriate solutions based on state-of-the-art technology. By combining the further evolution of our well-established silicon resonant sensors with digital circuit technology, we have developed an innovative product that can simultaneously measure multiple process data such as static pressure and differential pressure.”
"In the future, we also intend to devote resources to the development of new technologies in this area in order to continue delivering next-generation sensing technology."

    *MEMS:microelectromechanical systems

About Yokogawa
Yokogawa's global network of 19 manufacturing facilities and 89 companies spans 32 countries. Since its founding in 1915, the US$4 billion company has been engaged in cutting-edge research and innovation, securing more than 7,500 patents and registrations, including the world's first digital sensors for flow and pressure measurement. Industrial automation and control, test and measurement, information systems and industry support are the core businesses of Yokogawa.
For more information about Yokogawa, please visit our web site at

Related Links