New Indoor Air Quality Analysers

摘要

Quest Technologies (USA) is pleased to introduce the EVM-3 and EVM-4 to our environmental monitoring series of instrumentation. While both units feature the durability, quality and overall design of the EVM-7, the EVM-3 is optimised for particulate concentration measurement and the EVM-4 offers parameters specific to indoor air quality analysis.rnThe EVM-3 provides real-time direct reading of particulate concentrations, along with temperature and relative humidity measurements. The patent-pending dial-in impactors allow for quick selection of particulate settings PM~(2.5), PM~4, PM~(10) or TSP (within the instrument's measurement range) without disassembly. A built-in air sampling pump assists in the collection of particulates while the laserphotometer provides real-time measurement. A standard 25 or 37 mm gravimetric cassette can be utilised for sampling and laboratory analysis, and help provide correlation for real-time direct reading.