Dear Control Engineering: It’s been interesting following some of the problems that Apple is having with its iPhone 4. Should I be concerned about similar reception difficulties with wireless instrumentation devices? It’s difficult to compare a cell phone network and wireless instrumentation in a typical industrial plant, but some of the issues of...
Dear Control Engineering: I’ve been investigating using fieldbus architecture for field device wiring in a process unit, and it has the potential to be a fairly large installation if we proceed. Given that this technology has been around for many years now, how broadly has it been used in high-device-count installations?
For electronics to make their way onto commercial airliners, extensive testing and failure modes must be determined before they are certified for flight. Is there a similar requirement for automobile fly by wire systems?
Dear Control Engineering: I’ve read that RTDs (resistance temperature detector) are often the most precise temperature sensing devices. Given the relatively narrow range of resistance involved, how is it practical to get precision with two, three, or more decimal places on a Celsius scale?
Bruce Konzak writes:Dear Control Engineering: Does a single phase 240 Vac induction motor have the same performance characteristics when powered by an autotransformer with a line to neutral feeder, as it does when powered normally by a line-to-line connection 120 degrees out of phase?