Engerwitzdorf, Austria The CO2 Transmitter Series EE85 for HVAC from E+E Elektronik has been designed for accurate measurement of CO2 levels in heating, ventilation and air conditioning (HVAC) applications. It is available for measuring ranges of 0 to 2000ppm and 0 to 5000ppm. Its compact design allows easy installation in ventilation channels. CO2 detection is based on the accurate, non-dispersive infrared technology (NDIR). Aging effects are compensated by a patented auto-calibration procedure, which is the basis for the outstanding long-term stability of the series. Due to a small differential pressure created by a special construction of the sampling head, a small stream of air from the duct is led to the CO2 sensing cell and back into the duct. The air diffuses into the CO2 sensing cell through a diaphragm. The closed loop air stream and the diaphragm protect the CO2 sensing cell from pollution and by this avoid pollution related errors. Demand controlled ventilation based on CO2 minimizes fresh air to re-circulated air ratio which has a relevant impact on energy saving. E+E Elektronik GmbH , Engerwitzdorf, Austria. www.epluse.at.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.