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Yokogawa Electric has developed field wireless devices based on the ISA100.11a industrial wireless communications standard that are expected to satisfy industrial automation requirements.

The wireless products, which will be released in July, include an EJX-B series differential pressure and pressure transmitter, a YTA series temperature transmitter and an integrated field wireless gateway that connects field wireless devices with a host system and provides a number of field wireless network setting and management functions in field sensor networks.

The company plans to continue to develop various kinds of field wireless devices for both monitoring and control applications and is also proposing the development of field digital networks that integrate wireless and wired technologies.

Wireless technology, which is suitable for field device and control system applications, is said to reduce wiring and engineering costs.

Field devices can be installed in difficult-to-wire locations.

In addition, plant safety is improved through the use of low-cost online device diagnostics.

Yokogawa claims that, despite such benefits, wireless networks have seen limited use to date in industrial automation applications owing to their requirement for advanced technologies that ensure high reliability, real-time response, environmental resistance and explosion-proof protection and because of the absence until recently of an industrial communications standard for field wireless devices.

Approved in September 2009, the ISA 100.11a standard presents the following advantages for use in industrial automation: high reliability; suitability for a range of applications; improved flexibility and network expandability; and compatibility with existing wired systems.

Following approval by ISA and ANSI, this standard will be published and submitted for the review of the IECSC65C Subcommittee of the International Electrotechnical Commission (IEC).

The new field wireless devices based on the ISA 100.11a standard fully complement Yokogawa’s measurement, control and information solutions and are expected to contribute to the company’s Vigilantplant concept.

With bidirectional digital wireless networks based on the ISA100.11a standard, the production, device diagnostic and parameter data transferred between a control system and field devices are securely encrypted.

This wireless technology is ideal for status monitoring, device diagnostics and control applications.

The company’s wireless devices are designed to run on explosion-proof batteries that can be replaced in hazardous locations.

Yokogawa also plans to develop solar batteries for use with these devices.

The new wireless transmitters are claimed to simplify wireless deployment, management and operation.

The company plans to provide a trial kit that will allow customers to experience its wireless products.

Target markets include oil and gas, liquefied natural gas, refining, petrochemicals, chemicals, iron and steel, pulp and paper, power, non-metal/cement, food and beverages, water treatment and wastewater.

Applications include temperature, flow and differential-pressure/pressure measurement in plant processes.

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