EInst-071213-body.jpgThe BTU900 High Efficiency Economical Residential Combustion Analyzers from E Instruments now come with field replaceable sensors. The company says the analyzer meets the growing needs for boiler and burner set-ups, servicing, and maintenance. The units are available in two or three gas options, are upgradeable to NOx, and come with memory and software. The CO sensor is capable of readings ranging from 0-4,000 ppm. The analyzer also has a built in manometer, thermometer, and CO leak detector.