It seemed like a simple enough question. "How many pages we will have in the September issue?" I asked our managing editor. "That depends on who's counting," he replied. Our business department monitors pages according to ad revenue; the post office counts pages by demographic distribution; and we editors count pages in terms of articles, news, and other information in the magazine.
Keeping processes running to specification requires accurate calibration of plant instrumentation. Pressure instrumentation, including gages, switches, transmitters, transducers, and differential-pressure units, all require this attention on a regular basis. Calibration equipment types vary widely.
There's no safety like nuclear safety. Consequently, process safety instrumented systems (SIS) requiring a high safety integrity level (SIL) can benefit from a programmable logic controller (PLC) architecture used in nuclear safety systems. (See this issue's cover articles for related safety topics.
Adding intelligence to sensors is a definite trend in the industry. Not too long ago, users were content with just on/off contacts. Engineers now are eager to implement networks. With machine uptime a critical issue, the ability to implement diagnostics to improve maintenance response is also essential.
Stratford, Conn.— Ashcroft hazardous-duty process transmitters meet various standards for intrinsic safety. Sensors and signal conditioning circuits are interchangeable, making the transmitter upgradable and repairable by the user, which allows changeover on site. It offers 0.25% accuracy, male and female process connections, and a 4-20 mA output.
Considering the globalization trend of industry, a completed control system may be shipped anywhere in the world. To discover what users want and need in enclosures, Control Engineering surveyed 1,500 readers. Of the 465 responses, 50% work in process industries while 39% identified their primary application as discrete product manufacturing.
You have to install a new manufacturing data network. Before you call for a truck-load of twisted-pair copper wire, better check out all the applications. There may be areas where copper won't work.There are other choices. Fiber-optic technology is not new, but is becoming easier to use. Radio frequency is moving from warehouse data collection to sensors and networking.
Honeywell's Micro Switch Division recently entered the machine safety market with a broad product portfolio. The new product families include safety control modules, safety mats, solenoid key-operated safety interlock switches, and a miniature safety interlock switch. Honeywell Micro Switch has supplied safety products in Europe since 1982 and has already adopted Eu...
Industrial networks proponents at NMW emphasized ease of use and other attributes at exhibits and a concurrent FieldComms International (Mooresville, N.C.) conference.ControlNet International's (Coral Springs, Fla.) Bill Moss explained that industrial users should use ControlNet, rather than Ethernet, including media redundancy, intrinsic safety, determinism, and sch...
Durham, U.K.—Series HiD 2000 provides control system builders with the means to cut the number of cabinets needed for interfacing to hazardous areas. Four channels may be packed into an 18-mm wide plug-in module, compared to the one or two channels common today. Further space savings are gained by the range of termination boards for mounting modules which incorporate loop-disconnect ter...