These systems come with catalytic or electrochemical sensors to monitor for methane, chlorine, hydrogen sulfide and oxygen deficiency. They have a stand-alone design with built-in alarms and relays, automatic zero and span calibration, standard 4-20mA and RS485 Modbus digital ports, remote access and adjustment features, and a full-featured display with status indicators. They are made for monitoring pump rooms, screen chambers, wet wells, grit pump and wash areas, chlorine storage and metering area, and other work areas in wastewater treatment plants.
A make-your-own Star Wars Sith Lightsaber hilt is heftier and better-looking than most others out there, according to its maker, Sean Charlesworth. You can 3D print it from free source files, and there's even a hardware kit available -- not free -- so you can build one just in time for Halloween.
Highly regarded engineer and physicist Ransom Stephens speaks with Design News about his extensive science and engineering background, the serious yet funny study of neuroscience, and how one primes their brain for innovation.
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