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Adaptor plugs field devices into wireless networks
Yokogawa has announced the first in a series of multi-protocol wireless adaptors that will allow wired field instruments and sensors to be used as ISA 100 wireless devices. The first two models are aimed at wired Hart and RS-485 Modbus devices, and the company is planning to release further models that comply with other wired field communications standards, including Foundation Fieldbus and Profibus.
When the adaptor is mounted onto a wired field device – such as a temperature, pressure or vibration monitor – it can operate as an ISA100 Wireless device. By allowing users to choose from a wide range of field instruments and sensors, Yokogawa expects the adaptors to accelerate the take-up of field wireless systems.
The adaptors incorporate a lithium-ion battery that can also be used to power the field instrument or sensor, eliminating the need for power supply wiring. An indicator on the host system will show an estimate of the remaining battery life.
Yokogawa is planning to release versions of the adaptors that are waterproof and dustproof, as well as explosion-protected variants that can be used in the presence of inflammable gases.
Yokogawa released the world’s first ISA 100 Wireless devices and wireless pressure and temperature transmitters in July 2010. In July 2012, it released a large-scale field wireless system, and is now expanding the range of monitoring and control applications for wireless technologies and devices. The Hart and RS-485 Modbus versions of the wireless adaptors are due for release in May and July of 2014.
ISA 100.11a is compatible with various wired communications standards. The International Electrotechnical Commission is currently considering adopting a standard – IEC 62734 – which is based on ISA 100.11a.
Field wireless systems have numerous attractions such as their ability to place field instruments or sensors in difficult-to-wire locations, eliminating the need for cables to connect devices, and cutting installation costs.
