Yokogawa Technical Report / No.37 (2004)

Yokogawa periodically publishes the Yokogawa Technical Report, which contains articles that take a detailed look at the technologies employed in Yokogawa's products. At this site you will find links to all of the reports that have been published since 1997 as well as links to PDF files containing the full text of selected articles from each issue.

abstract

VIGILANCE -A YOKOGAWA COMMITMENT TO INDUSTRY-

Vigilance Campaign Office^*

* International Business Headquarters

YOKOGAWA'S BUSINESS STRATEGIES TOWARD UBIQUITOUS COMPUTING

NAGASHIMA Akira^*1

*1 Director, Chief Technology Officer

Executive Vice President of Corporate Research and Development Headquarters

As we enter the 21st century, the term "ubiquitous" is becoming just that-ubiquitous. The emerging benefits of "ubiquitous computing" have the potential of fundamentally altering the way we live and work. To summarize the major benefits, a ubiquitous computing environment will enable us to utilize information 1) from anywhere 2) without conscious effort 3) with a sense of super-realism 4) from the user's point of view, and 5) with the utmost flexibility and adaptability. These benefits will usher in a new era for measurement and automation as well. That is why we have declared the "Yokogawa ubiquitous initiative," whereby we have accelerated our R&D activities to help promote the real-life applications of ubiquitous computing technologies. To name a few of these activities that combine the fruits of our decades long R&D investments, we are playing a leading role in such emerging areas as IPv6 networks, advanced network security solutions, highspeed broadband network modules, widely distributed autonomous field instrumentation networks, and net sensing systems.

NEW DPharp EJX SERIES PRESSURE AND DIFFERENTIAL PRESSURE TRA

ISHIKAWA Tamaki^*1
ODOHIRA Tetsu^*1
NIKKUNI Masaaki^*1
KOYAMA Etsutaro^*1
TSUMAGARI Tetsurou^*1
ASADA Ryuuzou^*1

*1 Industrial Automation Business Headquarters

We have newly developed the DPharp EJX series of pressure and differential pressure transmitters with the advanced silicon resonant sensor. The DPharp EJX series employs a multi-sensing technology that enables both differential pressure and static pressure to be measured simultaneously. This technology eliminates the need for pressure gauges, contributing to cost reductions in plant installations. Moreover, the silicon resonant sensor featuring long-term stability further enhances the transmitter quality and reliability that have already been demonstrated by the industry-proven EJA series. The minimum response time and compactness of these intelligent differential pressure transmitters have been achieved using innovative technologies. The user-friendly multifunctional LCD display and the enhanced self-diagnostics and maintainability provide users with increased operation efficiency. The DPharp EJX series offers a wide variety of models, including diaphragm-sealed gauge pressure transmitters, diaphragmsealed differential pressure transmitters, screw-mount gauge pressure transmitters and differential mass flow pressure transmitters. In addition, it ensures conformability to various standards, including flame explosionproof, intrinsically safe explosionproof, safety standards SIL and EC directives. The series also ensures compatibility with HART and FOUNDATION fieldbus communication protocols.

Thanks to the enhanced flexibility in model selection and the added transmitter functionality, the EJX series has the excellent capability to meet the need for versatile applications, further contributing to minimizing customers' total cost of ownership (TCO).

NEW ADMAG AXF SERIES MAGNETIC FLOWMETERS

YOSHIKAWA Osamu^*1
SHIKUYA Norihiro^*1
TANAKA Toshiyuki^*1
TANABE Seiji^*1
ARAI Takashi^*1
OHTA Hironobu^*1

*1 Industrial Automation Business Headquarters

We have developed the new ADMAG AXF series, the world's first magnetic flowmeters with an electrode adhesion diagnostic function, as well as various application functions.

This paper describes the fundamental principles and development methods behind the new functions, and the advanced technology of the ADMAG AXF series, such as the linearity improvement of flow rate measurement and the decrease in variation between sensors by magnetic circuit simulation, the adhesion diagnostic function, and a full dot matrix LCD that can indicate what type of maintenance work should be performed when an alarm is issued.

"digitalYEWFLO Multivariable Type" VORTEX FLOWMETER WITH ...

WAKUI Hidekazu^*1
WADA Masami^*1
YOSHIOKA Takashi^*1
ANDOH Tetsuo^*1

*1 Industrial Automation Business Headquarters

Since its release in 2001, the "digitalYEWFLO" vortex flowmeters employing our original spectral signal processing (SSP) technology have achieved proven track records in the market with steady increases in shipment volume. Recently, we have developed one of the world's first two-wire "digitalYEWFLO Multivariable Type" vortex flowmeters with a built-in temperature sensor, which features more enhanced measuring functions while inheriting the high accuracy and reliability of the conventional "digitalYEWFLO" products.

With a temperature sensor incorporated into the flow rate sensor, "Multivariable Type" vortex flowmeters enable both fluid temperature measurement and flow rate measurement simultaniously, thereby achieving multisensing functions such as various correction calculations based on measured temperature data as represented by steam mass flow rate calculations,.

This paper outlines the structure, functions and features of "digitalYEWFLO Multivariable Type" vortex flowmeters using data from verification tests at actual users' plants.

ENHANCEMENT OF Exaquantum USING NEW TECHNOLOGIES

KISHIMOTO Naoya^*1
MASUTA Ken-etsu^*1