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2001 Press Releases-04

Tokyo, Japan - April 11, 2001

Yokogawa Field Devices Pass Rigid Safety Rating, Obtain Cenelec Certification

Yokogawa Electric Corporation announced today that the European Committee for Electrotechnical Standardization (CENELEC) has officially certified three series of Yokogawa field devices as conforming to its most rigorous explosion-proof standard, the FISCO model, applied to Foundation Fieldbus technology applications. The three product lines-Yokogawa's EJA series differential pressure/pressure transmitters, YTA series temperature transmitters and YVP valve positioners -are the first in their class in the world to receive FISCO conformity rating as recognized by the Foundation Fieldbus CENELEC Intrinsic Safety Approval.

Explosion-proofed systems, devices whose electrical signals are effectively shielded in order to prevent fires or explosions, play a critical role in the process manufacturing of combustibles, especially petroleum and petrochemical products, for obvious reasons. About 50 percent of Yokogawa's field equipment exports explosion-proofed as a result. Especially in Europe, Intrinsic Safety System is the most widely accepted and employed among the explosion-proof systems.

FISCO, or Fieldbus Intrinsic Safety Concept, is an engineering standard established by the Physikalisch-Technische Bundesanstalt (PTB), a national institute for science and technology of the Federal Republic of Germany. The FISCO model is considered to be the world's most stringent explosion-proof rating for fieldbus technology, a digital communications link that connects measurement and control devices and serves as a local area network (LAN) for process control and factory automation applications. The International Electrotechnical Commission is expected to adopt FISCO as its physical safety engineering standard this year, replacing the current ENTITY rating.

ENTITY not only limits fieldbus connections to four field devices but cable length and software applications to be used as well. With the CENELEC safety certification, up to ten devices conforming to FISCO can be interconnected and cable length extended. Yokogawa's certified field devices conform to both ENTITY and FISCO standards, and are designed to support next- generation digital fieldbus networks.

Foundation Fieldbus is an "open" technology initiative consisting of some 120 of the world's leading suppliers and end users of process control and manufacturing automation products, including Honeywell, Inc., Procter & Gamble, Yokogawa Electric and 10 of its subsidiaries and affiliates worldwide. The non-profit foundation, dedicated to a single, international interoperable fieldbus standard, was founded in 1994 in order to facilitate the shift from older, centralized plant control strategies to distributed control in the field.

Yokogawa has already received orders for 100 EJA-series, 60 YVP-series and 20 YTA-series devices from the Middle East, and projects total sales of 2,000 units in Fiscal 2001.

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

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