Wireless device transmits “stranded” HART data

Bullet WirelessHART adapter from MACTek expands device communication options.

05/21/2009


Stranded HART data is the diagnostic information available from the device, but not accessed by the control system.
MACTek Corporation
has completed development of its wireless adapter for use with HART-enabled devices. Dubbed the Bullet, it is intended to provide a cost-effective means to access real-time information from installed intelligent HART-enabled field devices. The first version to be released in October 2009 will be a general purpose non-certified model for use in non-hazardous areas. A certified intrinsically safe and explosion-proof model will be available for shipments early 2010.

The company says the Bullet enables existing wired HART field devices to communicate with host applications by means of WirelessHART technology. The Bullet is installed permanently by screwing it directly into a spare port on a HART field device, or connecting anywhere on the 4-20 mA current loop. A wired HART field device retrofitted with the Bullet communicates its process variable over the existing wiring to the DCS and simultaneously communicates diagnostic and device information over the WirelessHART network to process and asset management applications.

The Bullet can be powered by the current loop, or by using options for power scavenging or local external power. There is no provision for an internal battery. When powered by the current loop, users save the cost of battery maintenance, replacement, and disposal programs. If using the current loop is not practical, an external battery, solar cell, or energy harvesting device can serve as the source. If power consumption is critical, the device can be programmed to cycle itself off.

“I am pleased to announce the completion of this exciting and innovative product development.” says Thomas Holmes, MACTek president. “The fact that this device connects to existing installed HART-enabled devices provides a huge benefit to users as they continue to lower their operating cost by providing access to the stranded valuable information sitting in their measurement and control assets.”

For more on wireless HART data collection strategies, read HART for Legacy, Including Wireless .

—Edited by Peter Welander, process industries editor, PWelander@cfemedia.com ,
Control Engineering Process Instrumentation & Sensors Monthly
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