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Where Valves Are Used: On the Sea and Under the Ground

Valve Magazine takes a look at the roles valves and actuators play in two unique industry segments—marine and mining.

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Severe Service Valves Respond to New Pressures

Valves are called upon to respond to increasingly difficult conditions.

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Engineering Challenges for Flow Control of Reclaimed Water

Opportunities and challenges for the growing use of reclaimed water for irrigation and other purposes.

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The True Meaning of Double Block and Bleed

Rudy Garza of Exxon Mobil Upstream explains that while many think their block and bleed valves provide double isolation, they don’t—and that could be dangerous.

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Spotlight on Suppliers

Check out the sampling of new products from some of many suppliers that serve valve, actuator and control manufacturers.

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Sorting Out Wireless Standards for Smart Valves and Actuators
Written by Peter Cleaveland, Contributing Editor   
Tuesday, 05 January 2010 13:57

sorting_out_wireless_standards_for_smart_valves_and_actuatorsBack in the ’90s Profibus and Foundation fieldbus competed to replace 4-20 mA communication for field devices like valves and process transmitters with all-digital systems. This was supposed to save a great deal of money on cabling and make possible a new world of smart field devices that could be diagnosed and recalibrated in the field. HART, which put a digital signal on top of the existing 4-20 mA loop, was already there but was considered outmoded by promoters of the new buses.

 

Years later all three are still here, and now the battle is over the use of wireless networks in industrial settings. There’s WirelessHART, ISA100.11a, WiFi and the list goes on. It can be difficult to figure out which network is best suited for a particular application, and this isn’t helped by the fact that it’s difficult to figure out what standards govern them. This article will help to sort out the alphabet soup of different wireless standards.

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