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Explosion-proof transmitter/receiver: going wireless in hazardous environments.

How simple life once was. One walked into the diner, sat down on a stool or in a booth, and asked for a cuppa joe. For the day's news and information, one talked to the wait-staff, the cook, the other patrons, read a newspaper or listened to the radio. Today it's a lengthy menu of coffees, in a family of sizes, with an array of flavor additives, three varieties of creamers, several types of sweetener, and a choice of wood or plastic stirring stick. And the data du jour, if one is in the right place, beam wirelessly to the laptop computer or your cell phone.

Advanced wireless systems are the hot ticket of the season, pushed by rapid advances in broadcast technology and a growing demand from the users. It's been spilling out of the consumer market for a while, progressively finding more applications in industrial environments, in such devices as wireless sensors and data loggers. Likely the near future will see rooms of complex machines controlled by remote computer/operators without a communications cable in sight.

Helping usher in that era will be products like the XANT explosion-proof wireless I/O transmitter/receiver system from Adalet, Cleveland, OH. The crux of the system is a cast aluminum enclosure designed to house both antenna and transmitter. Hazardous location wiring can be extremely expensive or completely unfeasible. The company says this product will eliminate this obstacle by reducing labor costs for installation and eliminate the need for conduit and wires in hazardous or any industrial location. The Class 1, Division 1 enclosure is impact resistant to UL requirements, and features an integral wire-sealing chamber, eliminating the need for a field-installed poured sealing fitting.

A second model, the N4ANT, is also available for industrial or general-purpose areas rated NEMA 4X, where ruggedized protection is necessary against corrosion or damp. Both systems come complete with a transmitter and antenna already in the housing, and a receiver unit and antenna that can be installed in any of the company's stainless steel or fiberglass enclosures. The 1W transmitter has a range of 600 to l000 ft, with obstructed line of sight, for handling analog signals of 4-20 mA or three digital signals of 120 VAC at 0.5A. The transmitter features Frequency Hopping Spread Spectrum technology for interference-free operation, and operates on the license-free 902-928 MHz ISM band. Both receiver and transmitter are mounted on 17.5 mm wide DIN rails. Options include a 3/4-in. NPT factory sealed hub for DC power supply and analog signal communications, along with two additional 3/4-in. NPT hubs and a standard third conduit entry point that accommodates up to 1-in. NPT.

Besides factories, a few suggested applications include potential use with sensors for detecting tank levels; pump controls in waste, wastewater, oil and gas industries; irrigation systems; utilities systems; PLC/RTU extensions; SCADA systems; and mills and quarries.

--RM

Circle 155--Adalet, or connect directly to their website at www.rsleads.com/404df-155
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Title Annotation:Five Star Product Of The Month
Publication:Designfax
Date:Apr 1, 2004
Words:496
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